carrie and bill are members of the same gym. The gym charges a one time membership payment plus a monthly fee. carrie has been a member for 2 months and he has paid 50 so far. bill has been a member to 7 months and has paid 150$ so far

Percent increase and decrease. original number: 45 new number: 18

The mass of a marine organism, in pounds, p years after it is born is given by the polynomial function r(p) = -4p2 + 300p. find the mass when p = 20 years.

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.