Answer:
Step-by-step explanation:



In this case you would set it up as

(180 represents the degree of the triangle)
Add up like terms

Subtract 130 to the other side (180-130)

Divide 10 to the other side ( 50/10)
.

Hope this was clear :)
Idk what the dollar signs or what the letters represent, would help but doesnt make sense
AMOUNT OF GALLONS MULTIPLIED BY 8 :)