It goes all the way to 6 I just can't show it

The table below shows the cost, C(q), and revenue, R(q), in terms of quantity q. Estimate the marginal cost, C'(q), and marginal revenue, R' (q), for q between- 0 and 7. 0 1 2 3 4 5 6 7 K C(q) 8 9 14 15 19 28 36 45 R(q) 6 12 18 24 30 36 42 Estimate the marginal cost and marginal revenue using intervals of size 1 to the right. C' (q) R'(q) 0 i 2