At a theme park, the admission price for children is $7 and the admission price for adults is $21. The total amount the theme park collects in admissions for the day is $5439. The total number of visitors is 305. let c be the number of children and let y be the number of adults. which system represent the situation 21x+7y=5439
x+y=305

7x+21y=5439
x+y=305

x+y=5439
21x+7y=305

x+y=5439
7x+21y=305

Answer this question, only if you know the answer. 30 points and brainliest!

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.

C. using a standard deck of 52 cards, the probability of selecting a 4 of diamonds or a 4 of hearts is an example of a mutually exclusive event. true of false