Replace x with 3 and solve:
10 x 5^3
Simplify:
10 x 125 = 1250
Answer: y = 1250
Wow... what grade are you even in to be getting a problem like that? that's a difficult one...
15a =6a - 90
Move all the numbers with variables to one side
15a - (6a) = 6a -(6a) -90
9a = -90
9a/9 = -90/9
a = -9
Hope this helps
If f(1) =5-2(1)
F(2)=5-2(2)