Suppose you think the average driving speed on Interstate 94 is 75 mph. Your friend thinks that the average is really greater than 75 mph. To test this you take a sample of 36 people and ask them how fast they drive on Interstate 94. After collecting your sample, you calculate that the mean is 78 mph with a standard deviation of 9 mph and want to find if your friend is right with alpha

just keep asking questions until you have a better understanding.

step-by-step explanation:

answer:

at time x=0 we have 1000, at time x=1 we have 2000, at time x=2 we have 4000.  

so that's an initial value of 1000 and a ratio of 2,

y = 1000 (2^x)

hope this !

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:  

2/3=10/15

1/5=3/15

10+3=13/15

2 13/15 is the answer