It took stevens family 5 1/2 hours to travel 300 miles to a nearby city. what was their average rate of speed, in miles per hour, to the nearest mile?

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16