Brainliest! pls !
what is the equation of the quadratic graph with a focus of (4, −3) and a directrix of y = −6?
a. f(x)=1/6x^2+4/3x+11/6
b. f(x)=3/50x^2+11/25x+3/5
c. f(x)=2/50x^2+11/25x+2/5

if x = 1, then the answer is 3.5

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step-by-step explanation:

doubled

step-by-step explanation:

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

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