Solver for x, trigonometric ratios

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.

(x-5)1/2+5=2 what is possible solution of this equation

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2