A sewing project requires material costing $44 plus some tassels. If the material and tassels are to be purchased with four $20 bills, how many tassels can be purchased if they cost $2.40 each?

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.