Please show work.

Solve the Problem. 13} The driver of a car traveling at 34:) ftl'ser: suddenly applies the brakes. The position of the ear is s = 3|]t - 3t2_t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the ear come to a stop? 19} Find the number of units that must be produced and sold in order to yield the maximum profit, given the following equations for revenue and cost: em = 511:: - [1.st C(x} = 6x + 3'. 2a} The length of one arch of the curve y = 3 sin 2): is given by me L = I J1 + 35:09.22): d): {1 Estimate L by the Trapezoidal Rule with n = 5