The focus of a parabola is (-4,2). its directrix is x= -6. what are the equation and the vertex of the parabola? a. x + 5 = 1/4(y-2)^2 ; vertex: (-5,2)b. x + 5 = (y-2)^2 ; vertex: (-5,2)c. y + 2 = 1/16(x+4)^2 ; vertex: (-4,-2)d. y + 2 = 4(x+4)^2 ; vertex: (-4,-2)

i think it is 70

step-by-step explanation:

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)

answer: your answer is c

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: