An electric furnace has a return air (air entering the furnace) temperature of 70 degrees. the supply air (air leaving the furnace) is measured at 117 degrees. what is the temperature rise in degrees)?

This is so hard and it’s for a test

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)