Put the polynomial in standard form: 3x^2y-8x^4y^3+2x^5y3x 2 y−8x 4 y 3 +2x 5 y -8x^4y^3+2x^5y+3x^2y−8x 4 y 3 +2x 5 y+3x 2 y 8x^4y^3+2x^5y+3x^2y8x 4 y 3 +2x 5 y+3x 2 y 3x^2y-8x^4y^3+2x^5y3x 2 y−8x 4 y 3 +2x 5 y 2x^5y-8x^4y^3+3x^2y2x 5 y−8x 4 y 3 +3x 2 y

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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:  

your mom

step-by-step explanation: