Mary bought 9 boxes of pencils. there are 50 pencils in each box. what is the total numbercof pencils mary bought?

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Reduce fractions expressing probability to lowest terms. in 3,000 repetitions of an experiment, a random event occurred in 500 cases. the expected probability of this event is?

Plz hurry evaluate the expression a+b where a=8 and b=19