The price to buy a t-shirt was $10 dollars and now the price for the t-shirt is $8.50. What is the price decrease?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.