9+ 10 = 21 you can solve it just think outside the Box

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

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.

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0