Question

URGENT!!! TIMED!!!!

Kievan bought a new eraser that came in a cardboard wrapper.

What is the minimum amount of cardboard used for the wrapper?
38cm^2
40cm^2
76cm^2
80cm^2

IT'S NOT 40

Answer 1

third option

Explanation:

Answer 2

Answer: Third option.

Explanation:

You need to find the surface area with the formula for calculate the surface area of a rectangular prism:

`SA=2(wl + lh + hw)`

Where w is the width, l is the length, and h is the height.

You can observe in the figure that:

`l=5cm\\w=4cm\\h=2cm`

Then, substituting the values into the formula
`SA=2(wl + lh + hw)`, you get that minimum amount of cardboard used for the wrapper is:

`SA=2[(4cm)(5cm)+(5cm)(2cm)+(2cm)(4cm)]\\SA=76cm^2`