This is the last one but how do you find y ? what do I subtract 5 from ?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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.

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?