I think D. is the answer.
Step-by-step explanation:
First of all we need to know how odometer works. The change in odometer means the distance you have travelled.
Therefore:
112773-112352
=421 miles
Average, meaning you take the distance travelled divided by the gallons of gas used.
421/16
=26.3125
round up
≈26
24.2 / 550 = 0.044
The relative error is plus or minus 4.4 percent .
Answer:
1
Step-by-step explanation:
(2-0) / (6-4)
2/2
xxxxxxxx
Answer:
Step-by-step explanation:
As an example, iodine-131 is a radioisotope with a half-life of 8 days. It decays by beta particle emission into xenon-131. After eight days have passed, half of the atoms of any sample of iodine-131 will have decayed, and the sample will now be 50% iodine-131 and 50% xenon-131.
50 grams to 25 grams is one half-life. 25 grams to 12.5 grams is another half-life. So, for 50 grams to decay to 12.5 grams, two half-lives, which would take 36 days total, would need to pass. This means each half-life for element X is 18 days.
