What is the y-intercept of this graph?

What are the vertical asymptotes of the function f(x) =5x+5/x2 + x-2

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

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?