Which two equations represent the statement “48 is 6 times as many as 8”

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Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

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.