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4 years ago

7

Need help with this problem! ASAP!

1 answer:

coldgirl [10]4 years ago

6 0

Answer: B .128 in^3

Step-by-step explanation:

The question is asking for the volume of the figure so multiply the length times the width times the height.

v= 8.2 * 4 * 3.9

v= 127.92 which rounds to 128.

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Step-by-step explanation:

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3 years ago

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The graph shows the responses of 80 students who were asked whether they spend too much or too little time watching television.

Nana76 [90]

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$80 \div 100 \times 30 = \\ = 0.8 \times 30 = \\ = 24$

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3 years ago

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What is the simplified for of 7(-5y⁵)² ?

Darya [45]

1)Answer:

C) 8x² - 2

2) in the image above

Step-by-step explanation:

1)What is the area of the rectangle with the width of 2x - 1 and with the length of

(4x + 2)?

a. 8x² + 2

b. 8x³ - 2

c. 8x² - 2

d. 8x³ + 2

2)What is the simplified for of 7(-5y⁵)² ?

a. 176y¹⁰

b. 175y¹⁰

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d. 178y¹⁵

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3 years ago

Graph 4x-2y is greater than or equal to 4<br> what are the two points on the boundary line?

lyudmila [28]

The boundary line is the line
4x-2y=4
if y=0, x=1
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4 years ago

Suppose a home improvement contractor is painting the walls and ceiling of a rectangular room. The volume of the room is 288 cub

ratelena [41]

Answer:

The minimum cost is $17.30c

Step-by-step explanation:

Given

$V = 288$ --- Volume

$C_1 = 0.06$ --- cost of wall paint

$C_2 = 0.16$ ---cost of ceiling paint

Required

Minimum cost of paint

The volume is calculated as:

$V =xyz$

Substitute 288 for V

$288 =xyz$

Make z the subject

$z = \frac{288}{xy}$

The surface area is calculated as:

$Area = 2(yz + xz) + xy$

Because xy represent the dimension of the ceiling and the opposite of the ceiling (the floor) will not be painted. Hence, it does not require a coefficient of 2

The cost is:

$C = 0.06 * 2(yz + xz) + 0.16 * xy$

Substitute $z = \frac{288}{xy}$

$C = 0.06 * 2(y*\frac{288}{xy} + x*\frac{288}{xy}) + 0.16 * xy$

$C = 0.06 * 2(\frac{288}{x} + \frac{288}{y}) + 0.16 * xy$

$C = 0.12(\frac{288}{x} + \frac{288}{y}) + 0.16 * xy$

$C = (\frac{34.56}{x} + \frac{34.56}{y}) + 0.16 * xy$

$C = (\frac{34.56}{x} + \frac{34.56}{y}) + 0.16 xy$

Differentiate w.r.t x and y

$C_x = -\frac{34.56}{x^2} + 0.16y$

$C_y = -\frac{34.56}{y^2} + 0.16x$

By comparison: $x = y$

Set them equal to 0

$C_y = -\frac{34.56}{y^2} + 0.16x=0$

$-\frac{34.56}{y^2} + 0.16x=0\\$

Substitute x for y

$-\frac{34.56}{x^2} + 0.16x=0$

$0.16x=\frac{34.56}{x^2}$

Cross multiply

$0.16x^3 = 34.56$

$x^3 = \frac{34.56}{0.16}$

$x^3 = 216$

Take the cube root of both sides

$x = \sqrt[3]{216}$

$x = 6$

$x=y= 6$

Substitute 6 for x and for y in $C = (\frac{34.56}{x} + \frac{34.56}{y}) + 0.16 xy$

$C = (\frac{34.56}{6} + \frac{34.56}{6}) + 0.16 * 6* 6$

$C = (\frac{2*34.56}{6}) + 5.76$

$C = 11.52 + 5.76$

$C = 17.28$

$C = 17.3$ --- approximated

8 0

3 years ago