Answer:
Yes you are correct.
Step-by-step explanation:
The best way to check theese types of questions is go back in plug in X with your answer so 88+97+80+90(which is x)=360 then divide by 4 and get 90! So yes you are correct good job!
Answer:6.25
Let the height of the wall be h
Sin 74=h/6.5
h =6.5sin 74
h=6.25
55
let's solve: