30 + 54 what is the sum of the number and the product of their gcf and another sum?

Brent wants to know what is 5 x 1/2

Jermaine has t subway tokens. karen has 4 more subway tokens than jermaine. raul has 5 fewer subway tokens than jermaine. which expression represents the ratio of karen's tokens to raul's tokens

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.