Which sign makes the statement true 16/25 or 64%

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

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.

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)