What property is this 19=2x-7 26=2x urgent there is no multiple choice

Addition Property of Equality

We add 7 to both sides to go from 19 = 2x-7 to 26 = 2x

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:  

your answer is false.

replace the variable (x) with -3. insert it using parenthesis like this:

-35(-3) = -105

this statement is false because -35 multiplied by -3 is 105, not -105.