Guys, I don't understand this question is this correct??

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

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.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1