A, E, and D are collinear. BCDE is a parallelogram. B
1009
51
D
Find mZA
O A 51°
O B. 29°
OC 39°
Ο Ο
OD 580
O E 30°

2x3 – 6x2 – 14x + 24 square centimeters

if i'm wrong i'm sorry : )

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:  

slope intercept form is y = mx + b