<u>Answer:</u>-
The two inverses are,

and, 
<u>Step-by-step calculation:-</u>

⇒
⇒
So, the two inverses are,

and, 
So, this is a question that strictly relates to physics.
1st: multiply the average displacement by the number of people.
2nd: Divide this number by 80x40m^2 which will find the height .
In case you want more detail, please rate it well and send a message to me. I will calculate it for you.
Answer Z=2
The math …..
Multiple ( ) first
15z -21 -18z +22 = 32z - 52 -17
Combine like terms
-3z + 1 = 32z -69
Move like terms to isolate Z
-35z = -70 two negative make positive
35z = 70
Divide both sides by 35 to isolate Z
Z = 2
Answer:
a believe it is c..........
25/10x4=10 boys
100%-40%=60%
25/10x6= 15
boys:girls
10:15