Well since you already completed the table, a pattern would be that the left column is twice the amount of the right column ( 30x2=60, 35x2=75,etc.)
Answer:

Step-by-step explanation:
(F^(-1))x = 2x-4. Or y=2x-4
1. Switch the x and the y
2. Solve for y in the new equation
3. Change the y to inverse function of x.
Answer:
3x + 21 is your answer
Step-by-step explanation:
3(x+7)
3 × x = 3x
3 × 7 = 21
3x = 21