Buying three tires at $80 each and getting a fourth tire free

Answer

3 x 80=240

240 / 4=$60 effective unit rate for each tire.

Step-by-step explanation:

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ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source:  

where is the graph or the picture? ?