Ricardo has $25 to spend on school supplies he spends 72% of the money on a backpack and the rest on a large binder. how much does he spent on the backpack? how much does he spend on the binder?

$18 on Backpack $7 on binder. if you turn the percent into a decimal .72 and multiply .72 by 25 you get 18 which is the cost of the backpack. subtract 18 from 25 and you get $7 left meaning the binder was $7

we know that

the volume of the oblique pyramid with a square base is equal to

V=\frac{1}{3}BhV=

3

1

Bh

where

B is the area of the base

h is the height of the pyramid

In this problem

The area of the base is

B=EF^{2}\ units^{2}B=EF

2

units

2

h=AB\ unitsh=AB units

The two formulas to calculate h are

Applying the Pythagoras Theorem

h^{2}=AC^{2}-CB^{2}h

2

=AC

2

−CB

2

> h=\sqrt{AC^{2}-CB^{2}}h=

AC

2

−CB

2

h^{2}=AD^{2}-DB^{2}h

2

=AD

2

−DB

2

> h=\sqrt{AD^{2}-DB^{2}}h=

AD

2

−DB

2

therefore

the answer is

AB and EF

AC, CB and EF

AD, DB and EF