Given that 221 base x =25 base 10..find the base of x

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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.

What is the result of converting 60 ounces to pounds remember there are 16 ounces in a pound