Sean answers 4/5 of the questions on a test correctly. If there are 100 questions, how many did he not answer correctly?

Evaluate the polynomial for x=5 2x squared - 5x + 3

What does it mean for a relationship between two variables to be a function

Keith ran in a marathon. It took him 3 hours and 2 minutes to run 26 miles. If he ran at the same rate for the whole race, how many minutes did it take him to run each mile? (1 hour = 60 minutes)

A highway speed monitor is located on the side of the road that has a speed limit of 45 mph. The system records the speeds of passing vehicles. The data below shows the speeds of the first 9 cars that pass.

What is the y-coordinate of the vertex of the function y=2x^2+5x-8

Dr. Barber ordered 121 syringes and 53 needles. In total, how many items did Dr. Barber ordered

Jaime wants to know how fast she can type, so she times herself as she types a paper. The paper has 442 words in it, and Jaime types it in 13 minutes. What is her typing rate, in words per minute?

How can one fourthx - 3 = one halfx + 8 be set up as a system of equations?

Chris invests $2,200 into three accounts that pay 6%, 8% and 9% in annual interest. He has three times as much invested at 9% as he does at 6%. If his total interest for the year is $178, how much is invested at each rate?

If AC = 12 and BC = 13, find AB.