An elevator is on the tenth floor. It goes down 8 floors and then up 5 floors. What floor is the elevator in now?

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Siri can type 90 words in 40 minutes about how many words would you expect her to type in 10 minutes at this rate

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?