50 POINTS
If f(x) = 2x and g(x) = square root of x, what is the domain of (fºg)(x)?

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?

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.