Question

F(x) = 18x + 13, find F(4)

Answer 1

F(4) = 85

Explanation:

F(x) = 18x + 13

F(4) = 18(4) + 13

F(4) = 72 + 13

F(4) = 85

Answer 2

f(4) = 85.

Explanation:

When you substitute the 4 into the x and solve for f(4), all that means is that every x in the equation becomes 4. There's only one on the right side: the 18x. This becomes 18*4, or 72, which is then added to 13, to get 85.