What substitution should be used to rewrite 4x4 - 21x2 + 20 = 0 as a quadratic equation?

u = x2

u = 2x2

u = x4

u = 4x4

Chang runs each lap in 5 minutes. He will run at the most 30 minutes today. What are the possible numbers of laps he will run today?

Sally estimated that the cost of a new fish tank would be $45. The actual cost was 37.79. what was the percent error between sally's estimate and the actual amount

Andreus made $625 mowing yards. He worked for 5 consecutive days and earned the same amount of money each day. How much money did Andreus earn per day

How do I find the original price of an item after a markup?

The function f (x) = 2x^2+3x+5

5-2y=3x linear equations standard form

Ms. Herrera signed a contract stating that her salary for the first year will be $37,800. The contract also stated that she will receive a raise of $750/year each year after that. After how many years will and.

You reach into a bin of DVDs on sale at the drugstore and randomly pull one out and place it in your shopping basket. Then you reach in and randomly pull out another. Are the events independent or dependent? Why?

A shipment to a warehouse consists of 4,250 MP3 players. The manager chooses a random sample of 50 MP3 players and finds 2 that are defective. How many MP3 players in the shipment are likely to be defective?

To play the lottery in a certain state a person has to correctly select 5 out of 45 numbers