3. (10 pts] Find two positive numbers whose sum is 8 such that the sum of the cube of the first and the square of the second is a minimum. 4. (15 pts] A student is drinking a milkshake with a straw from a cylindrical cup with a radius of 4 cm. If the student is drinking at a rate of 3.5 cm' per second, how fast is the level of the milkshake dropping? (Note Volume of a cylinder is found by V = ar*h] 5. [10 pts) Find the following Inx lim a. 1-1-1 b. lim