The height above the ground of a person riding on the Ferris Wheel after t seconds is modeled by the following equation. What is the diameter of the Ferris Wheel? h(t) = 150sin(pi/90 * t) + 160

Ineed to know the answer to this algebra question.

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.

What is always true when two whole numbers are subtracted?