Given that y varies directly with x and x = 15 and y = 5 , then find what x would equal if y = 20 .

For what values of x is x2 + 2x = 24 true?

Rewrite the following quadratic functions in intercept or factored form. show your work. f(t) = 20t^2 + 14t - 12

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?