X^2-5x=14 I am supposed to get 14, but I don’t know how to get there. Also, how would check it on a calculator?

Given that de, df, and ef are midsegments of △abc, and de=3.2 feet, ef=4 feet, and df=2.4 feet, the perimeter of △abc is .

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.

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?