Calla has a $5 off coupon for an online
store. She notices that she can use her
coupon and get 4 items for the same
price as 2 items without the coupon. The
equation 4x - 5 = 2x represents the
situation, where x is the price of each
item. Which group of algebra tiles models
this situation?

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.