If 8a-4b=20 and 4a-8b=4, then what is the value of a-b?

Mike opens a checking account with an initial deposit of $200. Without making additional deposits, he withdraws $25 each week, Kyle also opens a checking account. The function y-25x + 200 represents the current balance in Kyle's account.

Rewrite in terms of sin (x) and cos (x). sin (x+[7pi/4])

3. Find the quotient of 5/31 divided by 15/23. Reduce your answer to the lowest fraction.

Tim, Moby, Rita and Cassie earned two dollars $20 dollar bills, three $10 dollar bills, three dimes, and two pennies from their shared paper route. How much should each receive? A. $1.76 B. $14.06 C. $17.58 D. $19.28

Paige starts a stamp collection with 4 stamps. Every month, she adds 3 starps to her collection. Which expression represents the number of stamps in Paige's collection, if m represents the number of months that have passed?

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.