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3 years ago

12

What is the volume of a cube on which each face has a diagonal of 12.8 inches? (round to nearest tenth)

2 answers:

Aleksandr-060686 [28]3 years ago

7 0

Answer:

volume of cube = side^3

=12.8^3

=2097. 152

alisha [4.7K]3 years ago

3 0

Answer:

D 2,097.2

Step-by-step explanation:

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How did you get that ? 709 × 68= 48212?

algol13

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3 years ago

What is the point-slope form of a line with slope 3 that contains the point

DanielleElmas [232]

Answer:

y-1 = 3(x-2)

Step-by-step explanation:

Point slope form is

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3 years ago

Length of a rectangle is 5 cm longer than the width. Four squares are constructed outside the rectangle such that each of the sq

Arte-miy333 [17]

Answer:

The perimeter of rectangle is $18\ cm$

Step-by-step explanation:

Let

x------> the length of rectangle

y----> the width of rectangle

we know that

The area of the constructed figure is equal to

$A=xy+2x^{2} +2y^{2}\\A=120\ cm^{2}$

so

$120=xy+2x^{2} +2y^{2}$ -----> equation A

$x=y+5$ -----> equation B

substitute equation B in equation A

$120=y(y+5)+2(y+5)^{2} +2y^{2}\\120=y^{2}+5y+2(y^{2}+10y+25)+2y^{2}\\120=y^{2}+5y+2y^{2}+20y+50+2y^{2}\\5y^{2}+25y+50-120=0\\5y^{2}+25y-70=0$

using a graphing calculator to resolve the quadratic equation

the solution is

$y=2\ cm$

Find the value of x

$x=2+5=7\ cm$

Find the perimeter of rectangle

The perimeter of rectangle is equal to

$P=2(x+y)\\P=2(7+2)=18\ cm$

3 0

4 years ago