Find the surface area of the pyramid.

A triangular pyramid. The base triangle has a base of 20 yards and a height of 17.3 yards. The height of a triangular face is labeled 12 yards.

The surface area is
square yards.

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Find the surface area of the pyramid.

A triangular pyramid. The base triangle has a base of 20 yards and a height of 17.3 yards. The height of a triangular face is labeled 12 yards.

The surface area is
square yards.

Skip to navigation

































Find the SA of a triangular pyramid, the base triangle is 20, the height of 17.3 yard, and 12

Answer:

x^3 + 5x - 23

Step-by-step explanation:

(Q+R)(x) is the same as Q(x) + R(x).

you just add them like so:

(x^3 - 9x^2 - 14) + (9x^2 + 5x - 9)

= x^3 + 5x - 23

Answer: Therefore, the height of the light pole is 50 feet.

Step-by-step explanation:

We can use proportions to solve the problem.

Let h be the height of the light pole.

Then, we have:

h / 75 = 8 / 12

To solve for h, we can cross-multiply:

12h = 75 * 8

h = (75 * 8) / 12

h = 50

Answer:

7 over -5

Step-by-step explanation:

The expression represent total number dime both have is 5d.

Mathematical expressions consist of at least two numbers or variables, at least one arithmetic operation, and a statement. It's possible to multiply, divide, add, or subtract with this mathematical operation. Unknown variables, integers, and arithmetic operators are the components of an algebraic expression. There are no symbols for equality or inequality in it.

Here Anna Has d dimes  and Brittany has 4 times as many dimes as Anna.

Then,

Number of dime Anna has = d Number of dime Brittany has = 4d

Now the total number of dimes both have is:

Total dimes = d+4d

= 5d

Hence the expression represent total number dime both have is 5d.

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If the value of C, the circumference is known, then the diameter is:

D = C/pi

For a circle whose radius is R, the formula for the circumference is:

C = 2*pi*R

Where pi = 3.14

Particularly, we know that the diameter of a circle is twice the radius, os:

D = 2*R

We can rewrite the circumference equation to get:

C = pi*(2*R) = pi*D

So, solving that equation for the diameter, we will get:

D = C/pi

That equation gives the diameter if we know the value of the circumference.

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Answer:x^2+12x-28=01. 12/2=62. (x+6)^2=x^2+12x+363. If we subtract 64 from this expression it becomesx^2+12x+36-64=x^2+12x-28 and so equals 0We now have (x+6)^2-64=0This is our old friend a^2-b^2=(a+b)(a-b)(x+6)^2-8^2=(x+6+8)(x+6-8)=(x+14)(x-2)=0 and so x=-14 or x=2

Step-by-step explanation:

The roots of the equation x² - 5x + k are z = (5/a - 3)/2 and z+3 = (5/a + 3)/2, and the value of k is 9/4.

The roots of an equation are the values of the variable that satisfy the equation and make it true. In the case of a quadratic equation of the form ax² + bx + c = 0, the roots are the values of x that satisfy the equation and make it equal to zero.

Given:  z and z+3 are the roots of the equation x² - 5x + k

The sum of the roots z and z+3 is:

z + (z + 3) = 2z + 3

And the product of the roots z and z+3 is:

z (z + 3) = z² + 3z

By Vieta's formulas, we know that the sum of the roots of a quadratic equation ax² + bx + c = 0 is -b/a and the product of the roots is c/a. Therefore, we can equate these expressions to the sum and product of the roots of the given equation:

2z + 3 = 5/a (since b = -5 and a = 1)

z² + 3z = k/a (since c = k and a = 1)

Solving for z in the first equation, we get:

2z = 5/a - 3

z = (5/a - 3)/2

Substituting this value of z into the second equation, we get:

[(5/a - 3)/2]² + 3[(5/a - 3)/2] = k/a

Simplifying and solving for k, we get:

k = a[(5/a - 3)/2]² + 3a[(5/a - 3)/2]

= (5a - 9a + 18)/4

= 9/4

Therefore, the roots of the equation x² - 5x + k are z = (5/a - 3)/2 and z+3 = (5/a + 3)/2, and the value of k is 9/4.

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Answer:

Step-by-step explanation:

Applying mathematical operations, "Four times the sum of 5 and some number is 20," the number is 0.

The mathematical operations include addition, subtraction, division, and multiplication.

Mathematical or algebraic operations use mathematical operands to manipulate values, variables, constants, and numbers to solve mathematical problems.

Zero is considered to be a neutral number since it is neither positive nor positive.

Zero is important as a number placeholder.

4 (5 + x) = 20

20 + 4x = 20

4x = 20 - 20

4x = 0

x = 0

Thus, in the mathematical operations of multiplying the sum of 5 and some number by 4, the applicable number is zero.

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Answer:

Step-by-step explanation:The sum of the measures of the angles in a triangle is always 180 degrees. So, we can set up an equation and solve for x:

36 + (6x+3) + 87 = 180

Combine like terms:

126 + 6x = 180

Subtract 126 from both sides:

6x = 54

Divide both sides by 6:

x = 9

Therefore, the value of x is 9.

The width of the chest shaped like a rectangular prism, to the nearest tenth of an inch is 32.1.

Kenji has made a treasure chest, shaped like a rectangular prism that must hold around 10,368 cubic inches of sand. In the second act of the school play, an actor will stand on the chest.

Therefore, the chest must be 24 inches tall. The length of the chest is twice its width.

To determine the width of the chest, you should first determine the length of the chest.

Then, using the formula for the volume of a rectangular prism, you can solve for the width of the chest.

Length of the chest

The formula for the volume of a rectangular prism is V = lwh

Given that the chest needs to hold around 10,368 cubic inches of sand, we can write 10,368 = lwh

Since the chest is twice as long as it is wide, the length (l) of the chest is equal to 2w.

Substituting 2w for l, we have:

10,368 = (2w)w

hence 5,184 = wh²(5,184/h)

= w*h(5,184/h²) = w

Since the chest must also be 24 inches tall, we can write:

h = 24 feet

Substituting this value into the equation, we have:

(5,184/24²) = w

hence w = 32.1 inches

Therefore, the width of the chest to the nearest tenth of an inch is 32.1 inches.

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The inflection points are at x = -[tex]\sqrt{(1/3)}[/tex] and x = sqrt(1/3), and f is concave up on (-[tex]\sqrt{1/3}[/tex]), [tex]\sqrt{(1/3)}[/tex]), and concave down elsewhere.

(a) To find the intervals on which f is increasing or decreasing, we need to find the first derivative of f and determine its sign.

[tex]f(x) = x^4 - 2x^2 + 3[/tex]

[tex]f'(x) = 4x^3 - 4x[/tex]

Setting f'(x) = 0, we get:

[tex]4x(x^2 - 1) = 0[/tex]

This equation has roots at x = 0, x = -1, and x = 1. We can use the first derivative test to determine the intervals of increasing and decreasing.

When x < -1, f'(x) is negative, so f is decreasing.

When -1 < x < 0, f'(x) is positive, so f is increasing.

When 0 < x < 1, f'(x) is negative, so f is decreasing.

When x > 1, f'(x) is positive, so f is increasing.

Therefore, f is decreasing on (-∞, -1) and (0, 1), and increasing on (-1, 0) and (1, ∞).

(b) To find the local maximum and minimum values of f, we need to look for critical points and evaluate the function at those points.

Critical points occur where f'(x) = 0 or is undefined. We have already found that f'(x) = 0 at x = 0, x = -1, and x = 1.

f(0) = 3, f(-1) = 6, f(1) = 2

Therefore, f has a local maximum at x = -1, with a value of 6, and local minimums at x = 0 and x = 1, with values of 3 and 2, respectively.

(c) To find the intervals of concavity and inflection points, we need to find the second derivative of f and determine its sign.

[tex]f(x) = x^4 - 2x^2 + 3[/tex]

[tex]f'(x) = 4x^3 - 4x[/tex]

[tex]f''(x) = 12x^2 - 4[/tex]

Setting f''(x) = 0, we get:

[tex]12x^2 - 4 = 0[/tex]

[tex]x^2 = 1/3[/tex]

x = ±sqrt(1/3)

We can use the second derivative test to determine the intervals of concavity.

When x < -sqrt(1/3), f''(x) is negative, so f is concave down.

When -sqrt(1/3) < x < sqrt(1/3), f''(x) is positive, so f is concave up.

When x > sqrt(1/3), f''(x) is negative, so f is concave down.

Therefore, the inflection points are at x = -sqrt(1/3) and x = sqrt(1/3), and f is concave up on (-sqrt(1/3), sqrt(1/3)), and concave down elsewhere.

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A procession typically has one-fourth of the participants with red hair, one-sixth with brown hair, and the remaining participants with black hair. 7/12 of the population has black hair.

We are given that 1/4 of the people have red hair and 1/6 of them have brown hair.

Let's add these fractions together to find the fraction of people who have either red or brown hair:

[tex]\\\frac{1}{4} + \frac{1}{6}\\ =\frac{3+2}{12} \\ =\frac{5}{12}[/tex]

This means that 5/12 of the people have either red or brown hair.

Since the remaining people must have black hair, we can subtract this fraction from 1 to find the fraction of people who have black hair:

1 - 5/12

=12-5/12

= 7/12

Therefore, the fraction of people who have black hair is 7/12.

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Answer:b

Step-by-step explanation:

just took the quiz

Answer:

16.8%

Step-by-step explanation:

When fourty percentage of the people in a town are females. 10% of the females are left -handed. Then total 16.8% of peoples in the town are not female and are left-handed.

We have a percentage data of people in a town. Percentage of female peoples in the town = 40 %

Percentage of female left handed = 10 %

Percentage of total left handed = 20.8 %

Percentage is defined as a ratio of a number to 100 or it expressed as a fraction of 100. Let Total population of the town = X

So, female peoples in the town = 40% of X = (40/100) × X

= 0.4X

The peoples who are not female = X - 0.4X = 0.96X

Number of female left-handed = 10% of 0.4X = (10/100)× 0.4X

= 0.04X

Number of all left-handed in the town

= 20.8% of X = (208/100)× X

= 0.208X

Left-handed peoples who are not female

= 0.208X - 0.04X

= 0.168X

The percentage of people who are not female and who are left-handed

= (0.168X /X )×100

= 16.8%

Hence, required percentage is 16.8%.

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Ricky has 23-word hours each week to dedicate to his classes. Homework takes 6.5 hours and each class (c) is 1.5 hours long. Thus, 05 classes Ricky takes every week.

There are 60 minutes in 1 hour. To convert from minutes to hours, divide the number of minutes by 60. For example, 120 minutes equals 2 hours because 120/60 = 2.

According to the Question:

Let us consider

a = hour she dedicates to his classes = 6.5 hours

and

b = hours spend on homework= 1.5 hours

Total hours in a week devoted to his classes = 23/7

Therefore, 23/7 ×1.5

                = 5 classes.

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Answer:

1/5 is the right answer in my opinion but I'm not sure

Answer:

m>22 and m[tex]\leq[/tex]34

Step-by-step explanation:

Step-by-step explanation:

Don't worry we will take care of everything. It's easy. listen carefully

first of all write your questions carefully.

i think it should be like this-

y= -6x +43 ------ (i)

y= -8x -59---------(ii)

1. We have two unknowns x and y. and two equations .

2. CONCEPT:- there are several ways to solve it like.

ACCORDING TO SUBSTITUTION METHOD:-

Simply, write the equation in term of single variable(unknown). * [ which is already done for us]

second step, substitute the expression of obtained variable in any one equation.

example: substitute the value of y from equation (i) in (ii)

we will obtained equation -

=> y= -8x -59 [ put value of y from (i) ]

=> -6x +43 = -8x -59

(solve and find x)

=> -6x +8x = -59 - 43

=> 2x = -102

=> x = -51

Third step in substitute method is, now substitute this obtained value of x in any equation (i) or (ii) to get unknown y.

y will be = 349

* your questions was wrong so i have made it by myself. if this does not match your question sorry from my side. buti have shown you the concept to solve this type of questions. You will be able to solve this by your self now by applying concepts.

Answer:

  1/2

Step-by-step explanation:

You want to know the average rate of change of f(x) = 1/2x -7 on the interval [2, 10].

A linear function has the same rate of change everywhere. Its instantaneous rate of change, average rate of change, and slope are all the same constant.

The given function is written in slope-intercept form, so we can identify the slope as the coefficient of x: 1/2.

The average rate of change is 1/2.

__

Additional comment

If you feel the need to "show work", you can evaluate ...

  AROC = (f(10) -f(2))/(10 -2) = (-2 -(-6))/8 = 4/8 = 1/2

The horizontal distance between the base of the ladder and the wall is approximately 6.58 feet

We can use trigonometric function to solve this problem. Let's call the horizontal distance we are looking for "x".

First, we can use the fact that the ladder forms an angle of 66° with the ground to find the vertical height it reaches. We know that the ladder is 16 feet long, and we can use the sine function to find the vertical height

sin(66°) = height/16

height = 16×sin(66°) = 15.12 feet (rounded to two decimal places)

Now, we can use the same angle and the cosine function to find the horizontal distance x

cos(66°) = x/16

x = 16×cos(66°) = 6.58 feet (rounded to two decimal places)

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Answer:

54 , 90

Step-by-step explanation:

Let John = 10x
Let Anvil = 6x

10x = 36 + 6x

10 - 6x = 36

4x = 36

x=9

Anvil = 6*9 = 54
John = 10*9 = 90

If 25 tapered pins are machined from a steel rod 15 ft long, then total 15 tapered pins can be made from a steel rod 9 ft long.

The unitary method is a method where you find the value of one unit and then find the value of the number of units you want. The formula for the units method is to find the value of a single unit and then multiply the value of the single unit by the number of units to get the desired value. We have specify that 25 tapered pins can be made up from a steel rod 15 ft long. Let 'x' represent the number of pins that can be made from 9 ft long steel rod. Now, using the unitary method,

number of pins machined from a 15 ft long steel rod = 25

number of pins machined from a 1 ft long steel rod = 25/15

So, number of pins machined from a 9 feet long steel rod, x = (25/15)×9

=> x = 3×5 = 15

Hence, required tapered pins made from a steel rod 9 ft long is equals to the 15 pins.

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Answer:

To simplify (1/2)³x(1/2)², we can multiply the coefficients and add the exponents with the same base:

(1/2)³x(1/2)² = (1/2)^(3+2) = (1/2)^5

Therefore, (1/2)³x(1/2)² simplified is equal to (1/2)^5, which can also be written as 1/32 in fraction form.

Step-by-step explanation:

In order to multiply we use the formula for indices' multiplication that is

[tex] {n}^{a} \times {n}^{b} = {n}^{a + b} [/tex]

Hence,

[tex]{( \frac{1}{2} )}^{3}( { \frac{1}{2}}^{2}) = {( \frac{1}{2} )}^{5} [/tex]

[tex] ( \frac{{1}^{5} }{{2}^{5} } ) = {2}^{ - 5} [/tex]

the value of k such that the line through (6, 4) and (k, 2) is parallel to the line y = 2x is k = 5.

How to solve the question ?

To find the value of k such that the line through (6, 4) and (k, 2) is parallel to the line y = 2x, we need to find the slope of the line y = 2x, which is 2.

Since two lines are parallel if and only if they have the same slope, we know that the line through (6, 4) and (k, 2) must also have a slope of 2.

Using the slope formula:

slope = (y₂ - y₁) / (x₂ - x₁)

where (x₁, y₁) = (6, 4) and (x₂, y₂) = (k, 2), we get:

2 = (2 - 4) / (k - 6)

Multiplying both sides by k - 6 gives:

2(k - 6) = -2

Expanding and simplifying gives:

2k - 12 = -2

Adding 12 to both sides gives:

2k = 10

Dividing both sides by 2 gives:

k = 5

Therefore, the value of k such that the line through (6, 4) and (k, 2) is parallel to the line y = 2x is k = 5.

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The graph given in this problem represents a proportional relationship with a constant of variation that is equals to -3.

A proportional relationship is a type of relationship between two quantities in which they maintain a constant ratio to each other. This means that if one quantity is multiplied by a certain factor, the other quantity will also be multiplied by the same factor.

The equation that defines the proportional relationship is given as follows:

y = kx.

In which k is the constant of proportionality, representing the increase in the output variable y when the constant variable x is increased by one.

For the graph given, when x increases by 1, y decays by 3, hence the constant is given as follows:

k = -3.

Then the equation is given as follows:

y = -3x.

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Since the minimum upward velοcity cannοt be negative, the answer is (A) 7.5 feet per secοnd. If we had taken the absοlute value οf the velοcity, the answer wοuld be (B) 19.7 feet per secοnd.

Velοcity is a physical quantity that describes the rate οf change οf an οbject's pοsitiοn with respect tο time. It is a vectοr quantity that has bοth magnitude and directiοn, with the magnitude representing the speed οf the οbject and the directiοn indicating its mοtiοn. In οther wοrds, velοcity tells us hοw fast an οbject is mοving and in which directiοn.

Tο find the minimum upward velοcity needed tο reach the branch, we can use the cοnservatiοn οf energy principle. At the height οf 5.5 feet, the weight has pοtential energy, which will be cοnverted tο kinetic energy as it falls. When the weight reaches the branch at a height οf 15 feet, all οf its initial pοtential energy will be cοnverted tο kinetic energy. Therefοre, we can equate the pοtential energy at the initial height with the kinetic energy at the final height:

[tex]mgh = (1/2)mv^2[/tex]

There m is the mass οf the weight (which cancels οut), g is the acceleratiοn due tο gravity (32 ft/s²), h is the initial height (5.5 ft), and v is the velοcity at the final height (15 ft).

Substituting the values, we get:

(32 ft/s²) * (15 ft - 5.5 ft) = (1/2) * v²

v² = 2 * (32 ft/s²) * (15 ft - 5.5 ft) = 800 ft²/s²

Taking the square rοοt οf bοth sides gives:

v = √(800) = 28.28 ft/s

Hοwever, we need the minimum upward velοcity, sο we must subtract the initial dοwnward velοcity (due tο gravity) οf 32 ft/s:

minimum upward velοcity = v - g = 28.28 ft/s - 32 ft/s = -3.72 ft/s

Since the minimum upward velοcity cannοt be negative, the answer is (A) 7.5 feet per secοnd, which is the magnitude οf the upward velοcity.

Nοte: If we had taken the absοlute value οf the velοcity, the answer wοuld be (B) 19.7 feet per secοnd. Hοwever, the minimum upward velοcity is the cοrrect answer in this cοntext.

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Answer:

3x + 18

Step-by-step explanation:

3 ( x + 6 )

= 3*x + 3*6

= 3x + 18

Answer:

Step-by-step explanation:

expand 3(x+6)

3(x + 6) =      

3 * x + 3 * 6

3x + 18

According to the question the height of the ladder is 34.641 feet, or approximately 19.98 feet.

Height is the measure of vertical distance, either how "tall" something or someone is, or the distance between the top and bottom of an object. It is measured in either centimeters, meters, or feet and inches, and can be used to describe the elevation of land or the altitude of an aircraft.

Let x be the height of the ladder.
For a 20-foot ladder at an angle of 45°, we have the following trigonometric equation:
tan(45°) = x/20
Solving for x we get:
x = 20tan(45°)
x = 20 × 1
x = 20
Therefore, the height of the ladder is 20 feet.
For a 20-foot ladder at an angle of 75°, we have the following trigonometric equation:
tan(75°) = x/20
Solving for x we get:
x = 20tan(75°)
x = 20 × 1.73205
x = 34.641
Therefore, the height of the ladder is 34.641 feet, or approximately 19.98 feet.

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The range of height can be determined by trigonometric ratios and the rage is 20ft to 74.6 ft(approximately).

What is Trigonometric Ratios?

Trigonometric Ratios are  based on the value of the ratio of sides of a right-angled triangle where Hypotenuse is the longest side Perpendicular is opposite side to the angle and Base is the Adjacent side to the angle. The ratios of these three sides of a right-angled triangle with respect to any of its acute angles are known as the trigonometric ratios of that particular angle.

Given that a ladder should not be set up at an angle less than 45 degrees or at an angle greater than 75 degrees.

The ladder is 20 foot.

here the trigonometric function tangent will be used.

By the formula, tan Ф = Perpendicular/ adjacent side [ where Ф is the acute angle]

Let, the height of the ladder is x foot.

Then by formula of trigonometric ratio,

tan 45° = x/20

⇒ x/20 =1 [ since tan 45° =1 ]

⇒ x= 20

Again,

tan 75° = x/ 20

⇒ x= 20× tan 75°

⇒ x= 74.6 [ since tan 75° = 3.732]

Hence, the range of height is 20 foot to 74.6 foot ( approx ).

The rough diagram is attached below.

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The 45th term of the sequence is 267.

The 45th term of a sequence can be calculated using the formula:

Tn = a + (n – 1)d

Where,

Tn = the nth term

a = the first term

n = the term position

d = the common difference

In this sequence, the first term is 3, the common difference is 6, and the term position is 45.

Therefore, the 45th term of the sequence is:

T45 = 3 + (45 – 1)6

T45 = 3 + (44)6

T45 = 3 + 264

T45 = 267

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