Matt gave half of his books to the local library and kept the other half. his best friend gave home 3 more books. he now has 57 books. how many did he have to start?

The area of a rectangle is 54x^9y^8 square yards.if the length of the rectangle is 6x^3y^4 yards,which expression represents the width of the rectangle in yards

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?

Arace is 10 kilometers long.markers will be placed at the beginning and end of the race course and at each 500 meter mark.how many markers are needed to mark the course for the race?