Find the least common multiple of these two monomials: 9a^2bc^3 and 30ab^2c^3 9a^2b^2c^3 3ab^3 90ab^3 90a^2b^2c^3

The inside wheels of a car traveling on a circular path are rotating half as fast as the outside wheels. the front two wheels are six feet apart. what is the number of feet in the path traced by the inside front wheel in one trip around the circle? express your answer in the form "k \pi", where k is an integer.

Find the value of the variable and the length of each secant segment.

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?