Tne ne pit SIOWS Me lengn ot tIme TUla prdcuce playing ne gutdr edt ddy Ot T0 days. Tula's Guitar Practices
1
Practice Time (hours)
What is the total length of time Tula practiced playing her guitar? Move numbers to the boxes to show the answer. If there is no whale
number,. put a O in the first box.
hours
2
3
5
0

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

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: