Which situations are BEST modeled by an exponential function? A)
The yearly depreciation of a car.
B)
An investment compounded annually.
C)
The cost of screws sold by the pound.
D)
The amount of sugar to make a pound of fudge.
E)
The annual growth rate of a city's population.

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left

Extra points! find the missing dimension! need asap