***WILL MAKE BRAINLIEST***
You are designing a monument and a base as shown on the right. You will use 90 cubic feet of concrete for both pieces. Find the value of x.

The value of x is 3.

Solution:

Length of the top rectangle = x ft

Width of the top rectangle = x ft

Height of the top rectangle = 3x ft

Volume of the top rectangle

Volume of the top rectangle cubic feet

Length of the bottom rectangle = ft

Width of the bottom rectangle = ft

Height of the bottom rectangle = 0.5 ft

Volume of the bottom rectangle

Volume of the bottom rectangle cubic feet

Total concrete for both pieces = 90 cubic feet.

Volume of top + volume of bottom = 90 cubic feet

Solve by factoring.

x = 3,

Solve using quadratic formula,

Ignore the complex roots.

The value of x is 3.

asdsad

step-by-step explanation:

b. f(x) = –√x + 3this is the correct answer