If r is the radius of a circle and d is its diameter which of the following is an equivalent formula for the circumference c = 2 pie r

a C = pie d2

b C = pie rd

c C = pie d

d C = 2 pie d

A survey was conducted at Springdale High to find the number of hours students sleep at night. The histogram shows the data collected in this survey.

In Chicago, IL, the average wind speed is 10.4 miles per hour. In Great Falls, MT, the average wind speed is 13.1 miles per hour. About how much greater is the average wind speed in Great Falls than in Chicago?

A study studied the birth weights of 1,278 babies born in the united states. the mean weight was 3234 grams with a standard deviation of 871 grams. assume that birth weight data are approximately bell-shaped.

The order of magnitude of 10000000

At 12:00 noon two mississippi steamboats are 126 miles apart. at 6:00 p. m. they pass each other going in opposite directions. if one steamboat travels 9 miles per hour faster than the other, find the speed of both boats.

What is the product of - 2 2/5 and - 3 5/6

Solve each system by substitution. (-3x + y = 20) (-5x - 7y = - 10)

What is 183 divided by 67?

Mary mixes white paint and blue paint in the ratio 2:3 she makes a total of 20 litres of paint how much more blue paint does she need to add to the mix ture so that the ratio of white paint to blue paint becomes 1:7

Suppose you want to test the effectiveness of a certain drug for treating a disease-that is, you want to see if using the drug is better the standard treatment.