A flash mob performing a dance routine at a mall will begin at a randomly chosen time between 9:00 A. M. And 5:00 P. M. Will's work shift at the mall begins at 4:00 P. M. If the flash mob begins in the afternoon, what is the probability that it will start during Will's work shift?

Math each whole number with a rational, exponential expression

Find the arc length of the semicircle. 7the grade

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.