How to get exact value of cos pi/2?

Write 2 8/9 as an improper fraction.

What are 3 numbers whose product is about 9,000

A 155 pound person burns about 500 calories per hour playing racquetball. one pound id equal to 3500. Q - If the person were to rest 5 minutes for every 30 minutes of playing, how long would it take to burn 1 pound?

Skylar is driving on a long road trip. She currently has 9 gallons of gas in her car. Each hour that she drives, her car uses up i gallon of gas. How much gas would be in the tank after driving for 5 hours? How much gas would be left after t hours?

Which system of equations can be used to solve the following problem? Each child ticket for a ride costs $3, while each adult ticket costs $5.

Use the binomial series series to expand the function as a power series. 3 / ((6+x) ^3)

There are 5 water birds swimming in a pond. If there are 3 ducks and 2 geese at the pond, what fraction of the birds are geese?

16a-24=8 (2a-3) how do I solve this

Mr. Anson bought 3 student tickets that each cost the same amount and an adult ticket that cost $12. In all, Mr. Anson spent more than $36. Which represents the cost of each student ticket?

3c-d=tcould you solve for c