10 POINTS Use the general form of the equation for an ellipse with center (0, 0) with a vertex at (5, 0) and a co-vertex at (2,0)

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:  

the answer should be 3.54 g/cm^3

10x12=120 i don't know what brainliest is.