4. The position function of an object is given by :0) = 2!' 12:" + 30: + 8. where time, t, is in seconds and distance, 3, is in metres. What is the object's acceleration at r = l? 5. The demand function for a product is given by p(x) = 10 000 0.05:3, where x is the number of units of the product sold and p is the price, in dollars. What is the marginal revenue when 130 units of the product are sold? 6. Determine the equation of the tangent to y = at x = 2 x +