Pete earned $8 an hour baby-sitting, and $10 an hour mowing the lawn. he baby-sat for 3 hours and mowed for 2 hours. how much more money does he need to buy a computer game that costs $45?

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.