Answer:

Step-by-step explanation:
10a + 9b = 3c
Subtract 9b to isolate the variable a.
10a = 3c - 9b
Now we need a singular a, so divide equation by 10.

So that's how you do it.
Answer:
Area=45
Step-by-step explanation:
Area=AC*BD/2=V12^2+(-9)^2*V6^2+8^2=(V144+81)*V36+64/2=V225*6/2=15*6/2=45
Answer:
Step-by-step explanation:
D
Answer:
h≈14.32ft
Step-by-step explanation: