Square EFGH has vertices at E(-4.1), F(0,5), G(4,1). What are the correct coordinates for H? A) H(0,-5)
B) H(0,1)
C) H(0,-6)
D) H(0,-3)
E) none of these

for the free

< < < emily> > >

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:  

isn't it a pentagon? sense [3 (triangle) + 4 (rectangle)] - 2 (triangle and rectangle connected) = 5 (pentagon)