Suppose that the height (in centimeters) of a candle is a linear function of
the amount of time (in hours) it has been burning.
Let x be the amount of time in hours
Let y be the heoght of a candle in centimeters
The two points are then as (9,24.5) and (23,17.5).














Now plug in x=21, we get

Thus the height of the candle after 21 hours is 18.5 centimeters.
Not me
Step-by-step explanation:
15/2 = $7.5 per hour
7.5 times 5 = $37.50 earned in 5 hours
If the question meant f(x)=2^(x) -3 then the answer should be 1 over 4 or 1/4