Your uncle has a sculpture displayed on
a display stand. The display stand is a
cylinder. The radius of the display stand
is 8.7 centimeters and the height of the
display stand is 27.8 centimeters. What is
the volume of the display stand?

2104.182 * pi

or

6610.13148

Step-by-step explanation:

formula for volume of a cylinder:

pi * r^2 * H

you know the radius and height, so you can substitute those:

pi * 8.7^2 * 27.8

calculate that:

pi * 75.69 * 27.8

2104.182 * pi

or

6610.13148

Apologies in advance if I explain things badly or get the wrong answer. :/

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: