\fQuestion 7 1 pts Determine the slope of the curve x^2 + y*2 - 6x -4y - 21 =0 at (0, 7). O 2/5 O -2/5 O 1/5 O 3/5 Question 8 1 pts A rectangular box having a square base and open at the top is to have a capacity of 16823 cc. Find the height of the box to use the least amount of material. O 28.74 cm O 18.41 cm O 16.14 cm O 32.28 cmQuestion 9 1 pts The cost C of a product is a function of the quantity x of the product is given by the relation: C(x) = x2 - 4000x + 50. Find the quantity for which the cost is a minimum. O 1000 3000 2000 O 1500 Question 10 1 pts A statue 3 m high is standing on a base of 4 m high. If an observer's eye is 1.5 m above the ground, how far should he stand from the base in order that the angle subtended by the statue is a maximum? O 4.41 cm O 3.71 cm O 3.51 cm O 3.41 cm