Find the length of the picture frame whose width is 3 inches and whose proportions are the same as 9- inches by 12-inch long frame?

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?

The diameter of the moon is about 3500 km. approximate the surface area of the moon using the formula for the surface area of a sphere, s = 4? r^2. write your answer in scientific notation.