Answer:

Step-by-step explanation:
Hello There!
The shown figure is a trapezoid
The formula for area of a trapezoid is

where a = base 1
b = base 2
h = height
the dimensions given are
13 & 7 - bases
5 - height
so all we have to do is plug in the values into the formula

So we can conclude that the area of the trapezoid is 50 cm²
Since you cannot have a fraction amount of a box, you will need to round up(you cannot NOT put in any books either, so you must round up).
118 rounded to the nearest multiple of is 120
120/5=
20+4=
24
24 boxes!
(he better be getting paid for this)
7 2/3 divided by 1 1/3 =
= (7 2/3) / (1 1/3)
= (23/3) / (4/3)
= 23/3 * 3/4
= 69/12
= 23/4
= 5 3/4
= 5 9/12