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1+y+z+ w = 15 have ? 5. How many POSITIVE integer solutions does the equation You can leave your answer as a product of integers. Answer:
You are stationary on the ground and are watching a bird fly horizontally towards you at a rate of −3 m/s. The bird is located 50 m above your head. How fast does the angle of elevation of your head change when the horizontal distance between you and the bird is 180 m? (Leave your answer as an exact number.)
4. You want to buy a three scoop cone at Baskin-Robbins (with the three scoops stacked one at the bottom, one in the middle, and one at the top, as usual). How many different choices do you have if you do care about the order of the flavors? (That is, Choco- late/Vanilla/Chocolate is different from Chocolate/Chocolate/Vanilla. Recall that there are 31 different flavors!) (A) C(31,3) (B) P(31,3) (C) 93 (D) 313 (E) 331 (F) none of the above