A rock is being launched into the air. 15 feet away from the launch site is a lamp. If the rock is travelling vertically upwards at 6 feet per second, what is the rate of change of the angle of elevation (θ) from the lamp to the rock when the rock is 45 feet off the ground? Submit an exact answer.

Someone . me. compound probability

33% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, (b) more than two, and (c) between two and five inclusive. if convenient, use technology to find the probabilities.

Rob filled 5 fewer plastic boxes with football cards than basketball cards. he filled 11 boxes with basketball cards.