Is (2, 3) a solution to the following system of
equations? How do you
know?
15x - y = 6
6y - 6x = 6

answer: i think it is (1,-2)

answer: the answer is e

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

source:  

11  

13

15

hope this