Combine like terms to simplify the expression below:
14x - (2x -y) -y step by step

I'm confused on this could anyone me and show me what i need to do to solve it.

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?

Three runners competed in a race data were collected at each mile mark for each runner if the runner ran at a constant pace the data would be linear