One pipe fills a storage pool in 20 hours. a second pipe fills the same pool in 15 hours. when a third pipe is added and all three are used to fill the pool, it takes only 6 hours. find how long it takes the third pipe to do the job.

Which of the following values is NOT equal to 11 (7-1) ? Choose one (A) (6+5) 6 (B) 6 x 7 + 8 x 3 (C) 1084 - 1018 (D) 3 x 22 (E) 5 + 1 (22-10)

A snail traveled 1/4 foot in 10 minutes. At that rate, how far does the snail travel in 1 minute? show your work.

Solve for x in the equation x2+4x-4-8.

Find the price of one candy bar if ten candy bars cost $40

US National forest cover approximately 300,000 square miles. conversationalist want the total square footage of forests to be 300,000 (2nd power) square miles away. When I Vanna used her phone to do the calculation, her screen showed 9e+10.

Tia was flying her model airplane. it took the airplane 5 seconds to go 90 feet. what was the average rate of speed of the model airplane, in feet per second?

Suppose the length of the prism is doubled how does the volume change explain your reasoning

1) Circle the equation that is NOT an example of direct variation. A) y = 3 X+1 B) y = 16x C) y = 4x D) y=-9x

A group of customer service surveys were sent out at random. The scores were 90, 50, 70, 80, 70, 60, 20, 30, 80, 90, and 20. Find the mean score.

How many type B tires does The Standard Inc. make on an average day?