In a certain town there were 328 robberies last year. This year the number of
robberies has
gone down 15%. How many robberies were there this year, to the
nearest whole number?

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.

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Anyone know these questions? i need ,.