Which of the sets of ordered pairs represents a function? a = {(1, −2), (3, −5), (5, 2), (7, 5)} b = {(4, 2), (4, −2), (9, 3), (9, −3)} - set a - set b - both a and b - neither a or b

b

step-by-step explanation:

2y+y=5

add 2y and y

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: