Consider the integral (x2+1) dx (a) Estimate the area under the curve using a left-hand sum with n = 3. Is this sum an overestimate or an underestimate of the true value? O overestimate O underestimate (b) Estimate the area under the curve using a right-hand sum with n = 3. Is this sum an overestimate or an underestimate of the true value? O overestimate O underestimate7. [-/1 Points] DETAILS | MY NOT Consider the following. 18 Find the exact value of f f(x) dx. 0 DETAILS MY NOTES 3. [-/1 Points] The graph of a function f(t) is given below. 100 (t ) 80 60 40 20 0.5 1.0 Which of the following four numbers could be an estimate of ( R(D ) at ? O -98.35 O 71.84 100.12 O 93.47