Which ratio is equivalent to the scale 1cm/50mi

1;50
49;50
50;1
1;51

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 you answer 2+2 you will get over 80 points

The longer leg of a 30-60-90 trangle is 18