Danielle drives from her home to the store at an average speed of 40 miles per hour. she returns home along the same route at an average of 60 miles per hour. what is her average speed, in miles per hour, for the entire trip

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?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?