Derek used a random sample of seven graders to determine the 14 out of 20 7th graders have cell phone if they’re 150 7th graders in the school estimate the number of seventh graders who have cell phones

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

How many $20 bills do you need to have to make $280

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.