What is y=x +1 and y=2x-1

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Prism m and pyramid n have the same base area and the same height. cylinder p and prism q have the same height and the same base perimeter. cone z has the same base area as cylinder y, but its height is three times the height of cylinder y. the figures and have the same volume.

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a