Avideo store charges a one-time membership fee of $12.00 plus $1.50 per video rental. how many videos can stewart rent if he spends $21?

Iknow the answer but the calculator doesn't seem to give the right one

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.

As a salesperson you get $53/day and $3.75/ each sal you make. if you want to make at least $128 in one day, how many sales would you need to make? a 10b 15c 20d 25