Which list shows all the factor pairs of 72? a. 1 and 72, 2 and 36, 3 and 24, 6 and 12, 8 and 9 b. 1 and 72, 2 and 36, 3 and 24, 4 and 18, 6 and 12, 8 and 9 c. 1 and 72, 2 and 36, 3 and 24, 4 and 13, 6 and 12, 8 and 9 d. 1 and 72, 2 and 36, 3 and 24, 4 and 18, 6 and 12, 7 and 9

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.