Ron finds 9 books at a bookstore, he can only afford 5 of them. in how many ways can he make his selection? how many ways can he make his selection if he decides one of them is a must?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.