I need help with these two problems please, and please make it legible.

The movement of a particle from time t = 0 tot = 2 is given by the equation s(t) = 4t2 - 5t - 3. What is the average velocity of the particle between t = 0 and t = 2? What is the instantaneous velocity of the particle at t = 2? # What is the acceleration of the particle at t = 2?The revenue function of a company as a function of units sold r is R(a) = 7x - 0.1x". How many units should the company sell to maximize revenue? units