What is the first step in subtracting 23 3/7 - 14 4/7? a) make 4/7 improper. b) make 23 3/7 improper. c) simplify. d) find the lcd.

answer: the answer is 110

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:  

the answer to this would be 5x^3-6x^2-24 over 3x^2

hope this if needed hmu