A cab driver charges a flat fee of 10$ per ride. The driver also charges $2.50 per mile driven. Write an expression to represent the total cost of a cab that drives x number of miles A: 2.50x-10
B: 10x-2.50
C: 2.50x+10
D: 10x +2.50

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?