6) Round off 78342 to the nearest thousand.​

step-by-step explanation:

a'(12.5,11.25)

slope=(y1-y2)/(x1-x2)

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:  

x > 4

step-by-step explanation:

solve for   x by simplifying both sides of the equation, then isolating the variable.