Help me i have been stuck on this problem for an hour

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.