Please explain to me.

The velocity of an object is given by the following function dened on a specied interval. Approximate the displacement of the object on this interval by subdividing the interval into the indicated number of subintervals. Use the lelt endpoint of each subinterval to compute the height of the rectangles. v=1i(4t+4){mi's) torDStSS; n=4 The approximate displacement of the object is D m. (Round to two decimal places as needed.) The velocities [in miihr} of an automobile moving along a straight highway over a 2hr period are given in the iollowing table. Ilia-um 40 Si] 5|] 40 50 40 45 Bi] V {mii'hr} 4i] a. Sketch a smooth curve passing through the data points. b. Find the midpoint Riemann sum approximation to the displacement on [0,2] with n = 2 and n=4. a. Choose the conect graph below. a?! A. a}? a. -:::::- c. 32- o. 3 in: a 3 in: Q to run so- 6" so 6" so so 4 Bi 4 L.' 3 t 3 t 2 2 u 0.5 1 1.5 2 u 0.5 1 1.5 2 b. The midpoint Riemann sum approximation to the displacement on [[1,2] with n=2 is 9!? miles. (Type an integer or a decimal.) The midpoint Riemann sum approximation to the displacement on [[1,2] with n= 4 is 925' miles. (Type an integer or a decimal.)