Cylinder a has radius r and height h. cylinder b has radius 4r and height 4h. how many times greater is the surface area of cylinder b than the surface area of cylinder a?

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.