The Denver Post reported that, on average, a large shopping center had an incident of shoplifting caught by security 2.5 times every six hours. The shopping center is open from 10 A.M. to 9 P.M. (11 hours). Let r be the number of shoplifting incidents caught by security in an 11-hour period during which the center is open.

In the last year, a total of 14,905 earthquakes occurred in a country. Of these, 89.3% were minor tremors with magnitudes of 4.9 or less on the Richter scale. How many minor earthquakes occurred in the country in the last year?

Jester's Deli sells 640 sandwiches at a price of $8 each. A market survey shows that for every $0.10 reduction in price, 40 more sandwiches will be sold. Let x represent the number of $0.10 reductions.

If sara walks her dog every 3 days, and marsha walks her dog every 2 days, at the end of 60 days, how many days will they have walked their dogs together?

Safety regulations require that the time between airplane takeoffs (on the same runway) will be at least 2 minutes. When taking off, the run time of an airplane on the runway is 48 seconds. Planes are on average waiting 5 minutes and 30 seconds for takeoff. On average there are 16 planes taking off per hour. How many planes are either on the runway or waiting to take off? Note: Round your answer to 2 decimal places.

The manager of a branch office of Banco Mexicali ob-served that during peak hours an average of 20 custom-ers arrives per hour and that there is an average of fourcustomers in the branch office at any time. How long doesthe average customer spend waiting in line and beingserviced?