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?

What is z if 2.5% of z equals 75% of 50?

Given the series 2,5,8,11,…. what is the 12 th term of this sequence?

What is the smallest of four consecutive odd integers whose sum is 968?

A student finishes half of an exam in 2/3 of the time it takes him to finish the 2nd half. If the entire exam takes him an hour, how many minutes does he spend on the first ½ of the exam?