Answer:
5x = 90+15
x = 21
Step-by-step explanation:
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F(x) is just another way to express the "y" in an equation. f(x) is function notation. f(x) = 3x-4 is just another way of writing y = 3x-4. f(x) is found on a graph as the y value that comes out when the x value is applied to the function.
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When they say to solve for a variable, they want you to isolate/get the variable by itself.
5.) Solve for b (get b by itself)
Multiply 2 on both sides to get rid of the 1/2
2A = bh Divide h on both sides
6.) Solve for r
Divide 2 and on both sides