Oliver bought 7.49 worth of groceries he bought it with a twenty dollar bill how much change should he have left

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Runner ran 1 4/5 miles on monday and 6 3/10 on tuesday. how many times her monday’s distance was her tuesdays distance