How many triangles can be constructed with angle measurements 90°,45°,50° ?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

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.

How to simply and write the answer n a whole number