Dally and marta had the same number of postcards. after sally sold 18 of her postcards, marta had 4 times as many postcards as sally. how many postcards did each girl have to begin with.

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 (monthly car loan payment per $1,000 borrowed) i need !

Which expression is not a polynomial?

Solve the system of equations. 2x-2y=-4 and x+y=8. show work