Jeremy is trying to calculate how much it will cost to add extra recessed lights into his new house. The equation C(r) = 140r + 100 represents the cost C() as a function of the number of lights (r). What does C(9) = 1360 represent in the context of the problem?

5050

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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:  

its   c, f, a

step-by-step explanation: