I hope this helps you
56+35+CB=180
CB=91
AE=117
AEC=180+56=236
BDA=89+56+180=325
Sidexside=volume 2x3=6cm and I can’t remember if volume is squared or not
The main idea is using the Pythagorean formula to find the length of line segment
.
Alr so you use the formula 
is already given and is 
and
is 
So using algebraic rules you'll get
as:

Now using the formula:
, you can find the area of tri ABD and CBD which would be
and
so add them up and you get
!
Answer:
she bought 5 erasers
Step-by-step explanation:
25-5 is 20 and 20 divided by 4 is 5