12/15
Divide 12 by 15 and then you should get 0.8
0.8 is obviously equal to 8/10ths or 80%
Hope this helps :)
Answer:96
Multiply 3x4 and 2x3 which gives you 12 and 8 then you multiply those and you get 96.
The amount of substance left of a radioactive element of half life,

after a time, t, is given by:

Given that <span>potassium-40 has a half life of approximately 1.25 billion
years.
The number of years it will take for 0.1% of potassium-40 to remain is obtained as follows:

Therefore, </span><span>the maximum age of a fossil that we could date using 40k is
12.5 billion years.</span>
38 1/4 as a decimal would be 38.25 because 1/4 is 0.25 add 38 to that would be 38.25
Answer:
rate of change = -0.32
Step-by-step explanation:
Rate of change = slope,m
