(i) Find the average rate of change of ℎ over the interval −2≤𝑥≤4 
(ii) Use the average rate of change found in (i) to estimate ℎ5.2 
(iii) Let 𝐿𝑥 be a linear function that estimates the value of ℎ𝑥 based on the average rate of change computer in (ii). For −2≤𝑥≤4, which is greater, the actual value of ℎ𝑥 or the linear approximation? Use concavity to explain how you know.