3) The soles of :1 new product grow at :1 rate of 5'0) = 4!: + 5 units per week. Where t is weeks, and 5 is units. a) Recover the Sales function 5(t) given 25 units were sold the second week. b) Use your soles function to find how many units were sold in the tenth week? 4) Given: z = f(x,y) = 3x2 + 5y3 + e2y - 6x3y find each: a) Zx = b) Zxy = c) Zy (2,0) = 5) Find the area bounded by f(x) = x2 - 4 and g(x) = 3x. Shade the area you are finding. Set up the integral and use the calculator to evaluate