Ab + c = d solve for a​

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

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.

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project