Can someone please help me?

Consider the function f(x)=-5x+3 what is f(-2)

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

Mariano delivers newspaper. he always puts 3/4 of his weekly earnings in his savings account and then divides the rest equally into 3 piggy banks for spending at the snack shop, the arcade and the subway