The number that is used to show the value of one currency compared to another is called the a. trade rate b. currency rate c. exchange rate d. import-export exchange

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Often called simply "velocity," this is the velocity of an object at a particular moment in time.