On a backpacking trip through europe, troy spent 20 swiss francs to stay one night in a youth hostel. if the foreign exchange rate between the u. s. dollar and the swiss franc is 1: 2.2, how much did troy spend in u. s. dollars?

Rai compares two cable plans from different companies. which equation gives the correct value of mm, the number of months for which plans a and b cost the same?

Three coins are flipped. what is the probability that there will be at least two tails?

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.