F(x)=2x² + 12, what is f(3) 3 12 18 30

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

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?

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?