Answer:
8) x = 12
9) x = 12
Step-by-step explanation:
Use geometric mean of legs

x=12
10)
Use geometric mean of legs

x=12
i believe it’s D because where you have 20 marked it’s 20 more from where you are which would be around 40 which is why i’m saying D
Answer:
u = -7
Step-by-step explanation:
-3+4u=-31
Add 3 to each side
-3+3 +4u = -31+3
4u = -28
Divide each side by 4
4u/4 = -28/4
u = -7