Mary decreased her time in the mile walk from 20 minutes to 17 minutes. What was the percent of decrease?

How do i put 3(x+7) in distributive property

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

Oliver had $50 on the day before his birthday. after he recived some money for his birthday , he had $75. write and solve eqaution to find how much money oliver received for his birthday. x+50=75