On tuesday bill bought nine posters. on wednesday half of all the posters that he had were destroyed. on thursday there were only 24 left. how many did he have on monday?

Solve the system of equations. y= 2x y= x^2 - 15

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.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)