The equation of a parabola is y=1/2x2+6x+23. What is the equation of the directrix?

y = 5.5

y = 4.5

​y = 2​

​y = 0.5

what "following statement"?

step-by-step explanation:

i dont know the answer but here's a picture of a dog

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: