1 )a) Find an estimate of the area under (x) = = above the interval [2, 4] using 8 subdivisions and right endpoints. Show all calculations. b) Explain how you could determine whether this is an overestimate or an underestimate, without knowing the actual value of the area.2)a) Find an estimate of the area under g(x) = 6vx above the interval [10, 15] using 5 subdivisions and midpoints. Show all calculations. Write your answer to at least 3 decimal places. b) Draw a typical rectangle involved in this calculation, and use the concavity of the function g to explain why the area estimate in part (a) is an overestimate.3) Find the actual area of the region described in problem #1. (Use FTC.) Write as a decimal. 4) Find the actual area of the region described in problem #2. (Use FTC.) Write as a decimal