The object distance is 0, which implies that the object is at the focus of the concave mirror.
For a concave mirror, the magnification is given by the formula:
m = -di/do
where m is the magnification, di is the image distance, and do is the object distance. Since we are given that the magnification is -2.0, we can write:
-2.0 = -di/do
Simplifying this expression, we get:
di = 2do
We can also use the mirror formula for a concave mirror:
1/f = 1/do + 1/di
where f is the focal length of the mirror. Substituting di = 2do and f = -16 cm (since the mirror is concave), we get:
1/-16 = 1/do + 1/(2do)
Multiplying both sides by -16do, we get:
do - 2f = -32
Substituting f = -16 cm, we get:
do - (-32) = -32 + 32
do = 0
This means that the object distance is 0, which implies that the object is at the focus of the concave mirror. This is a valid result, since a concave mirror can form a real, inverted image for an object placed at a distance equal to its focal length. In this case, the magnification would be -1, not -2. So, it is not possible to have a magnification of -2 for an object distance in front of a concave mirror with a focal length of 16 cm.
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For each of the values a=1, a=2,a=4, and a=6
find the area of the circle shown. the diameter is given.
Answer:
624.26 m²Step-by-step explanation:
We are given with a circle whose diameter is 28.2 m
Then, Radius will be diameter/2
=> 28.2 /2
=> 14.1 m
Area of circle = πr²
=> 31.4 × (14.1)²
=> 31.4 × 198.81
=> 624.26 m²
Therefore, the area of the given circle is 624.26 m²
Write a recursive sequence that represents the sequence defined by the following
explicit formula:
an = -2-4(n − 1)
Solve the separable differential equation, showing working out:
[tex]\frac{dy}{dx}=\frac{2y+4}{x}[/tex]
The solution of the given differential equation by using variable separable is [tex]y=\frac{x^2c}{2}-2[/tex]
An equation involving one or more functions and their derivatives is referred to as a differential equation in mathematics. The rate of change of a function at a particular moment is determined by the function's derivatives. It is mostly employed in disciplines like biology, engineering, and physics. The study of solutions that satisfy the equations and the characteristics of the solutions is the main goal of the differential equation.
The rules to solve differential equations using variables separable,
1) [tex]\frac{dy}{dx}=f(x)/f(y)[/tex]
2) separate terms with the same variable
f(y)dy=f(x)dx
3) Take integration on both sides
4) solve integration by using a suitable method
5) Then get the Solution of the differential equation.
The given differential equation is-
[tex]\frac{dy}{dx}=\frac{2y+4}{x}\\\\\frac{dy}{2y+4}=\frac{dx}{x}\\\\\int\frac{dy}{2y+4}=\int\frac{dx}{x}\\\\\frac{log(2y+4)}{2}=logx+logc\\log(2y+4)=2logxc\\2y+4=x^2c\\2y=x^2c-4\\y=\frac{x^2c}{2}-2[/tex]
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Consider the following square pyramid:
Calculate the Volume of the pyramid.
Volume = _____ m3
The Volume of the pyramid.
Volume = 288.67 m³
As the volume of the pyramid is the amount of space enclosed inside the pyramid, the formula to find the volume of a square pyramid is given as;
Volume = (1/3) × base area × height.
Where: Base area (B) = s²
Where; s = length of the square pyramid side
And, Height (h) = perpendicular height to the base.
Substituting the given values in the formula we get;
Volume = (1/3) × s² × h
Given, s = 8.5m and h = 12m
Therefore, Volume = (1/3) × 8.5² × 12
= (1/3) × 72.25 × 12
= 288.67 m³
Thus, the volume of the given square pyramid is 288.67 m³, to the nearest hundredth of a cubic meter.
The volume of any pyramid is a measure of the total amount of space enclosed within the pyramid. If you have a pyramid of a specific shape and size, you can calculate its volume by using an appropriate formula. In this case, we have been given the length of the square pyramid side (s) and the perpendicular height (h) of the pyramid to the base. We can use the formula to calculate the volume of the pyramid.
The formula is Volume = (1/3) × base area × height.
For a square pyramid, the base area is the area of the square that forms the base. Since all four sides of the square are of equal length, the area is given as the square of the length of one of the sides. Thus, Base area (B) = s².
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using diagonals from a common vertex, how many triangles could be formed from a 14-gon?
Using diagonals from a common vertex of a 14-gon, a total of 11 triangles can be formed.
To see why, we can apply the formula for the number of triangles formed by drawing all the diagonals from a single vertex of a polygon, which is (number of sides - 2). For a 14-gon, the formula gives us:
number of triangles = (14 - 2) = 12
However, we need to subtract one from the total because the vertex where the diagonals are drawn from is not included in any of the triangles. Therefore, the number of triangles formed by drawing diagonals from a common vertex of a 14-gon is:
number of triangles = 12 - 1 = 11
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Answer: 14-2=12
Step-by-step explanation:
Differentiate y = 7x^4.
Therefore, the derivative of y = 7x⁴ with respect to x is dy/dx = 28x³.
What is differentiation?Differentiation is a mathematical concept that refers to the process of finding the derivative of a function. The derivative of a function is the rate at which the function changes with respect to its independent variable. In other words, it measures how quickly the output of the function is changing as the input value is changing.
The derivative of a function can be used to determine many properties of the function, such as its slope, maximum and minimum values, and whether it is increasing or decreasing. It is an important tool in calculus and is used in many fields, including physics, engineering, economics, and finance.
The process of differentiation involves applying specific rules to a given function to determine its derivative. The most common method of differentiation is using the power rule, which states that the derivative of a function raised to a power is equal to the product of the power and the function raised to the power minus one. Other rules include the product rule, the quotient rule, and the chain rule, which are used to differentiate more complex functions.
by the question.
To differentiate y = 7x⁴, we need to use the power rule of differentiation, which states that if [tex]y = kx^{n}[/tex], where k is a constant and n is a non-negative integer, then the derivative of y with respect to x is dy/dx = [tex]\frac{dy}{dx} = nkx^{(n-1)}[/tex].
Using this rule, we can differentiate y = 7x⁴ as follows:
dy/dx = 47[tex]x^{4-1}[/tex] [applying the power rule]
dy/dx = 28x³
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Pls help due tomorrow!!!
Answer:
C = 11,21 cm
using the formulas :
A (area) = 10 [tex]cm^{2}[/tex]
A = π [tex]r^{2}[/tex]
C = 2 π r
colving for C :
C = 2 *√(π*Α) = 2 *√(π * 10) = 11,20998 cm
two step equation
find the value in the eqaution
4/q (q-10)=8
The solution q = -10 does not satisfy the original equation. Therefore, there is no solution to the equation.
What are equations?
A mathematical definition of an equation is a claim that two expressions are equal when they are joined by the equals sign ("="). For illustration, 2x - 5 = 13. 2x - 5 and 13 are expressions in this case. These two expressions are joined together by the sign "=".
To solve the equation [tex]\frac{4}{q}(q-10) = 8[/tex] we can begin by simplifying the left side of the equation:
[tex]\frac{4}{q}(q-10) = 8[/tex]
[tex]\Rightarrow \qquad 4(q-10) = 8q \text {multiply both sides by }q[/tex]
[tex]\Rightarrow \qquad 4q - 40 &= 8q && \text{distribute }4 \\\\\Rightarrow \qquad -40 &= 4q && \text{subtract }4q\text{ from both sides} \\\\\Rightarrow \qquad -10 &= q && \text{divide both sides by }-4.\\\end{align*}[/tex]
Therefore, the solution to the equation is q= -10. We can check our answer by plugging q= -10 back into the original equation:
[tex]\frac{4}{q}(q-10) &= 8 \\\\\\\Rightarrow \qquad \frac{4}{-10}(-10-10) &= 8 && \text{substitute }q=-10\\\\\\\Rightarrow \qquad -\frac{4}{5} \cdot (-20) &= 8 \\\\\\\Rightarrow \qquad 16 &= 8\end{align*}[/tex]
Since the last equation is false, the solution q = -10 does not satisfy the original equation. Therefore, there is no solution to the equation.
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john is looking for an existing multi-story building zoned for mixed-use. he wants to open a small, by-reservation-only restaurant on the lowest floor. local code requires 15 square feet per person in a commercial setting with non-concentrated seating. what is the minimum square footage he needs to serve 50 people?
To serve 50 people, the minimum square footage needed would be 750 square feet.
Let us analyze the given question and solve the problem given. The problem is asking about the minimum square footage of the multi-story building that is required to open a small restaurant on the lowest floor. The building is already zoned for mixed use.
John wants to open a small, by-reservation-only restaurant on the lowest floor. He needs to calculate the minimum square footage he needs to serve 50 people. Let's calculate the minimum square footage that John needs to open the restaurant. If local code requires 15 square feet per person, then 15 x 50 = 750 square feet are needed for 50 people. In other words, John needs at least 750 square feet of space to serve 50 people at his restaurant.
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a right conical tank with the point oriented down, a height of 14 feet, and a radius of 6 feet has sprung a leak. how fast does the depth of water change when the water is 2 feet high if the cone leaks water at a rate of 13 cubic feet per minute?
The depth of water changes at a rate of -13/72π feet per minute when the water is 2 feet high.
To begin, we must use the formula for the volume of a cone, which is given as:
V = 1/3πr2hwhere V represents the volume, π represents the constant pi, r represents the radius, and h represents the height.
Substituting the given values into the formula, we get:
V = 1/3π (6 ft)2(14 ft)V = 1/3π (36 ft2) (14 ft)V = 1/3π (504 ft3)V = 168π ft^3
Now, we must determine the rate at which water is leaking. It is given that the cone leaks water at a rate of 13 cubic feet per minute. This implies that the volume of the water reduces by 13 cubic feet every minute. Therefore, the rate of change of the volume of water is -13 cubic feet per minute. Here, the negative sign indicates a decrease in the volume of water.
Now, we must find how fast the depth of water changes when the water is 2 feet high. Let d represent the depth of water. Then, the volume of water is given as:
V = 1/3πr^2d
We know that when d = 2 ft, V = 1/3π(6 ft)2(2 ft)
V = 8π ft^3
Now, we must determine how fast the volume of water is changing with respect to time when d = 2 ft. We differentiate the expression for V with respect to time to get:
dV/dt = (d/dt)[1/3πr2d]
dV/dt = 1/3πr^2(d/dt)[d]
dV/dt = 1/3πr^2(d/dt)[2]
dV/dt = 2/3πr^2
The rate of change of the volume of water with respect to time is given as -13 cubic feet per minute. Therefore, substituting this into the expression above, we get:
-13 = 2/3π(6 ft)2(d/dt)
When we simplify the above equation, we get:
d/dt = -13/72π
Therefore, when the water is 2 feet high, the depth of the water changes at a rate of -13/72π feet per minute.
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The number of minutes, m, that it takes to
print a batch of newspapers is inversely
proportional to the number of printers used,
n.
The equation of proportionality is m =
100
n
Calculate how long it will take to print a
batch of newspapers if 20 printers are
used.
If your answer is a decimal, give it to 1 d. p.
It will take 5 minutes to print a batch of newspapers if 20 printers are used.
What is proportionality?
Proportionality is a mathematical relationship between two variables, where one variable is a constant multiple of the other. In other words, two quantities are proportional if they maintain a constant ratio to each other, meaning that as one quantity increases or decreases, the other quantity changes in the same proportion.
We are given that the time it takes to print a batch of newspapers, m, is inversely proportional to the number of printers used, n, and the equation of proportionality is:
m = k/n
where k is a constant of proportionality. We are also given that when k = 100, the equation is satisfied. So we can substitute k = 100 into the equation to get:
m = 100/n
To find the time it will take to print a batch of newspapers if 20 printers are used, we can substitute n = 20 into the equation:
m = 100/20 = 5
So it will take 5 minutes to print a batch of newspapers if 20 printers are used. Rounded to 1 decimal place, the answer is 5.0 minutes.
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Find the probability of rolling a 6-sided dice and getting a number that is a divisor of 20.
Answer:
The divisors of 20 are 1, 2, 4, 5, 10, and 20. A 6-sided dice has the numbers 1 to 6 on its faces. The probability of rolling a number that is a divisor of 20 is the number of favorable outcomes divided by the number of possible outcomes. There are four favorable outcomes (1, 2, 4, and 5) and six possible outcomes (1 to 6). Therefore, the probability is 4/6 or 2/3 or about 0.67.
a colony of bacteria starts at 10,000 and the number doubles every 40 minutes. find the formula for the number of bacteria at time t.
The formula for the number of bacteria at time t is given by N = 10,000e^(0.0173t).
The formula for the number of bacteria at time t can be found using the exponential growth formula. The formula for exponential growth is given by;N = N0ertWhere;N is the number of bacteria after t minutes.N0 is the initial number of bacteria.r is the growth rate.t is the time interval.
To find the formula for the number of bacteria at time t, substitute the given values into the exponential growth formula.N0 = 10,000r = ln2/40 = 0.0173 (since the number of bacteria doubles every 40 minutes, the growth rate is equal to the natural log of 2 divided by 40.)t = t minutesN = 10,000e^(0.0173t)
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er
A keyboarding instructor at a community
college collected data comparing a
student's age and their typing speed.
The equation for the line of best fit is
given as y=-1.4x + 117.8, where x is the
"age in years" and y is the "typing speed.
If you are 25 years of age, what is your
typing speed?
If you are 25 years of age, your typing speed is equal to 82.8 units.
What is a line of best fit?In Mathematics, a line of best fit is sometimes referred to as a trend line and it can be defined as a statistical or analytical tool that is typically used by researchers and mathematicians in conjunction with a scatter plot, in order to determine whether or not there is any form of association and correlation between a data set.
Based on the scatter plot, we can logically deduce that an equation which represents the line of best fit include the following:
y = -1.4x + 117.8
When you are 25 years of age, your typing speed can be calculated as follows;
y = -1.4x + 117.8
y = -1.4(25) + 117.8
y = -35 + 117.8
y = 82.8 units.
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c) (-1,2) m = -4
What is the equation of the line?
Answer:
Point-slope form:
[tex]y - 2 = - 4(x + 1)[/tex]
Slope-intercept form:
[tex]y = - 4x - 2[/tex]
Standard form:
[tex]4x + y = - 2[/tex]
Step-by-step explanation:
[tex]y - 2 = - 4(x + 1)[/tex]
[tex]y - 2 = - 4x - 4[/tex]
[tex]y = - 4x - 2[/tex]
[tex]4x + y = - 2[/tex]
Use the figure below to answer the following questions. NOT TO SCALE!
10
2
12
6
6
a. Give the perimeter of the figure.
b. Give the area of the figure.
Junits2
c. If the figure above was a yard measured in feet, and sod cost $2.99 per square foot, how much would it cost to sod the yard.
units
d. If the figure above was a garden measured in feet, and you wanted to put up edging that cost $8.87 per 6 foot piece, how much would it cost to
edge the garden? (you cannot by part of a piece) S
Perimeter of the figure is 56 units.
Area of figure is 100sq. units²
Cost to sold the yard is $299
For edging, total cost is $82.8
Define perimeter and areaPerimeter and area are two important measurements used in geometry to describe the size and shape of two-dimensional figures.
Perimeter is the measurement of the distance around the outside of a two-dimensional shape. It is the sum of the lengths of all the sides of the shape.
Area is the measurement of the space inside a two-dimensional shape. It is the amount of surface that the shape covers. For example, the area of a rectangle can be calculated by multiplying the length of the rectangle by its width.
Perimeter of the figure=sum of all sides of the figure
=10+4+2+12+6+6+2+4+6+4=56 units.
Area of figure=10×4+6×6+4×6
=40+36+24
=100sq. units²
Cost to sold the yard=area× cost per square foot
=100×2.99
=$299
Given: edging costs $8.87 per 6 foot piece
For edging, total cost =total perimeter/no.of foot piece×$8.87
=(56/6)×8.87
=496.72/6
=$82.78≈$82.8
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The area of a rectangle is 6x^2 + 9x, and its width is 3x. What is the length of the rectangle?
Answer:
L=2x-3
Step-by-step explanation:
A =L×W
Given,
A=6x²-9x
W=3x
Substituting into the main equation
6x²-9x=L×(3x)
3x(2x-3)=L×(3x)
divide both sides by 3x
2x-3=L
L=2x-3
Math help . Find x in the picture please
Answer:
x = 7 ft
Step-by-step explanation:
[tex]tan 55=\frac{10}{x}\\x=\frac{10}{tan 55}\\x=7.0020\\x=7[/tex]
what if circumference of circular table having diameter 'd 'mater? find it
consider the sample of 1,400 past negligence cases. suppose you are willing to let the 67% estimate be within .025 (2.5%) of the true proportion. you are willing to assume 95% confidence. is 1,400 an adequate sample size for the estimate of 67%? show why or why not
We can be reasonably confident that our estimate of 67% is within 2.5% of the true proportion.
What is percentage?
A percentage is a way to describe a part of a whole. such as the fraction 1/4 can be described as 0.25 which is equal to 25%.
To convert a fraction to a percentage, convert the fraction to decimal form and then multiply by 100 with the '%' symbol.
To determine if a sample size of 1,400 is adequate for estimating a proportion of 67%, we need to calculate the margin of error and compare it to the given tolerance level of 0.025.
We can use the following formula to calculate the margin of error:
E = z x √(p x (1-p)/n)
where:
E is the margin of errorz is the z-score corresponding to the desired confidence level (95% corresponds to a z-score of 1.96)p is the estimated proportion (67% or 0.67 as a decimal)n is the sample size (1,400)Plugging in the values, we get:
E = 1.96 x √(0.67 x (1-0.67)/1400) ≈ 0.025
So, the margin of error is approximately 0.025. This means that we can expect the true proportion to be within 0.025 of the estimated proportion with 95% confidence.
Since the calculated margin of error is equal to the desired tolerance level, we can conclude that a sample size of 1,400 is adequate for estimating a proportion of 67% with the given level of confidence and tolerance. Therefore, we can be reasonably confident that our estimate of 67% is within 2.5% of the true proportion.
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Who invented the number zero?
Aryabhata, the famous Indian mathematician discovered 0.
What is an Integer?Integers include all whole numbers and negative numbers. This means if we include negative numbers along with whole numbers, we form a set of integers.
The concept of zero was first developed by ancient Indian mathematicians as early as the 5th or 6th century CE. However, the actual symbol for zero (a small circle) was invented by the Indian astronomer and mathematician Brahmagupta in 628 CE.
Aryabhatta, the famous Indian mathematician discovered 'zero'. Grutsamad discovered the process of writing zeroes after figures.
Hence, Aryabhata, the famous Indian mathematician discovered 0.
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Determine the value of k such that the points whose coordinates are given lie on the same line. (k, 2), (0, −2), (10, −7)
The value of k that makes the three points lie on the same line is -8.
To determine the value of k such that the given points lie on the same line, we can use the slope-intercept form of the equation of a line, which is:
y = mx + b
where m is the slope of the line, and b is the y-intercept.
First, we can find the slope of the line passing through the two points (0, -2) and (10, -7):
m = (y2 - y1) / (x2 - x1)
m = (-7 - (-2)) / (10 - 0)
m = -5 / 10
m = -1/2
Now, we can use the slope-intercept form with the point (0, -2) to find the value of b:
-2 = (-1/2)(0) + b
b = -2
So the equation of the line passing through the two points (0, -2) and (10, -7) is:
y = (-1/2)x - 2
To check if the point (k, 2) lies on this line, we can substitute k for x and 2 for y in the equation:
2 = (-1/2)k - 2
4 = (-1/2)k
k = -8
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Angela, the head of the office party planning committee, sent two coworkers, Kevin and Dwight, to the party store to purchase party hats and party whistles. Kevin purchased four packs of party hats and three packs of party whistles, and paid a total of $15.53. Dwight purchased three packs of party hats and four packs of party whistles, and paid a total of $13.73. When they returned to the office, Angela informed them that they were supposed to buy a total of four packs of party hats and four packs of party whistles and sent them back to the store to straighten things out. How much should they be refunded?
the mean daily production of a herd of cows is assumed to be normally distributed with a mean of 37 liters, and standard deviation of 4 liters. a) what is the probability that daily production is less than 44.4 liters? use technology (not tables) to get your probability.
The probability that daily production is less than 44.4 liters is 96.71%
According to the given data, the mean daily production of a herd of cows is assumed to be normally distributed with a mean of 37 liters and a standard deviation of 4 liters.
We need to calculate the probability that daily production is less than 44.4 liters using technology, not tables.Using technology, we can use the standard normal distribution formula to get the required probability.
We can use the standard normal distribution to calculate the probability that the daily production is less than 44.4 liters. To do this, we first need to standardize the variable:
z = (x - μ) / σ
where x is the value we are interested in, μ is the mean, and σ is the standard deviation.
Substituting the given values, we have:
z = (44.4 - 37) / 4 = 1.85
Using a standard normal distribution table or a calculator with a normal distribution function, we can find that the probability of a standard normal random variable being less than 1.85 is approximately 0.9671.
Different calculators may have slightly different ways to calculate normal probabilities. Here is an example using a TI-84 calculator:
Press the "2nd" key, then "Vars" to access the "Distr" menu.Select "normalcdf" from the menu.Enter the lower bound (-1E99 if it's negative infinity), the upper bound (44.4), the mean (37), and the standard deviation (4) in the appropriate fields. For this problem, you would enter normalcdf(-1E99, 44.4, 37, 4).Press "Enter" to calculate the probability. The answer should be approximately 0. 9671.Therefore, the probability that the daily production is less than 44.4 liters is approximately 0.9671, or 96.71% (rounded to two decimal places).
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your recipe calls for 7 ounces of granulated sugar, but your kitchen scale only measures weight in grams. how many grams of granulated sugar will you need to measure to equal 7 ounces?
Answer:198.447
Step-by-step explanation:
just search 7 ounces to grams
Pls help right away asap 20 point question!!
The answer of the given question is , the predicted average retail price of a car in 2003 is $9860.40.and the car will be worth $814 in the year 2010.
What is Regression Equation?A regression equation is a mathematical formula that is used to describe the relationship between two or more variables. It is typically used in statistical analysis to model the relationship between a dependent variable and one or more independent variables.In simple linear regression, there is only one independent variable, and the regression equation takes the form of a straight line. In multiple regression, there are two or more independent variables, and the regression equation takes the form of a more complex mathematical function.
Using a calculator, we can input the data points into a regression equation to find the line of best fit. Using the given data, we get the regression equation:
y = -1357.4x + 18003.8
where y represents the retail price of a car and x corresponds to the year, with x = 1 representing 1998.
To predict the average retail price of a car in 2003, we need to substitute x = 6 (since 2003 corresponds to x = 6) into the regression equation:
y = -1357.4(6) + 18003.8
y = -8144.4 + 18003.8
y = 9860.4
So, the predicted average retail price of a car in 2003 is $9860.40.
To determine the year when the car will be worth $814, we need to substitute y = 814 into the regression equation and solve for x:
814 = -1357.4x + 18003.8
Simplifying, we get:
-1357.4x = -17189.8
x = 12.65
Rounding up to the nearest whole number, we get x = 13, which corresponds to the year 2010. Therefore, the car will be worth $814 in the year 2010.
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In the figure, BC=26, EF=22. Find OD. Round to the nearest hundredth.
Check the picture below.
[tex]\begin{array}{llll} \textit{using the pythagorean theorem} \\\\ c^2=a^2+o^2 \end{array} \qquad \begin{cases} c=\stackrel{hypotenuse}{13}\\ a=\stackrel{adjacent}{OD}\\ o=\stackrel{opposite}{11} \end{cases} \\\\\\ (13)^2= (OD)^2 + (11)^2\implies 13^2-11^2=OD^2\implies 48=OD^2 \\\\\\ \sqrt{48}=OD\implies 6.93\approx OD[/tex]
find the circumference of 80 cm using π ² = 3.14
Answer:
....
Step-by-step explanation:
can you provide an image if the question instead...
Select the expression that represents this real-world situation.
A roll of ribbon is r inches long. There are 4 colors of ribbons. If Ava used 4 inches from each roll, what is the expression for the total length of ribbons left?
4 x (r − 4)
(4 x r) − 4
4 ÷ r − 4
4 ÷ 4 + r
The expression for the total length of ribbons left is: r - 16 . But we can also write this expression as: 4 x (r - 4) because 4 x (r - 4) = 4r - 16, which is equivalent to r - 16.
What is Algebraic expression ?
Algebraic expression can be defined as combination of variables and constants.
The expression that represents the total length of ribbons left is:
4 x (r - 4)
This is because Ava uses 4 inches from each roll of ribbon, and there are 4 rolls of ribbon in total. So the total length of ribbon used is 4 x 4 = 16 inches.
To find the total length of ribbon left, we need to subtract the length of ribbon used from the original length of ribbon, which is r inches.
Therefore, the expression for the total length of ribbons left is: r - 16
But we can also write this expression as: 4 x (r - 4) because 4 x (r - 4) = 4r - 16, which is equivalent to r - 16.
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