Mastery of parabolas is essential for math on the ACT and SAT. For parabolas, vertex is (h,k) for y=a(x-h)^2 + k form; for y=ax^2+bx+c form vertex is x= -b/2a

What is the average of the first 50 positive integers?

In the geometric sequence (9,18,36,72) where b1 =9, what is the value of b12?

What is the average of 4x+5, 7x-6, and 8x+2?

Lenny’s average score after 3 tests is 88. What score on the 4 th test would bring his average up to 90?

An agent receives a commission of 40 cents for every $50 of business she procures. What percent is the agent’s commission?