1. What two key words tell you
that the
problem is an
equation and
not an
expression?

answer: i dont know i want points

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 square root of 16 is 4.

4*4 = 16

4+3x is the answer

hope you got it