What is the cost of a $19,500 plus a 6% sales tax?

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

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Joe has a rectangular chicken coop. the length of the coop is 4 feet less than twice the width. the area of the chicken coop is 510 square feet. what is the length of the chicken coup?