Aplane travels 3,625.26 miles in 6.9 hours. what is the plane’s unit rate?
a. represent this situation with a fraction.
b. represent this situation using the same units.
c. estimate the quotient.
d. express the divisor as a whole number.
e. use the division algorithm to find the quotient.

The correct answers are:

a)

b)36252.6 tenths miles÷ 69 tenths hours

c)

d)

e) 525.4 miles/h

Step-by-step explanation:

The division is solved by using the division algorithm in the attached picture.

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 is a.

606.0 sq. in.

i got it down.