Answer: 3 (Finished equation would look like
)
Step-by-step explanation: to find answer, divide 12 by 4 and the answer will be 3. 3 is the answer because 3 times 4 equals 12.
4n - 7 = 13
4n = 20
n = 5. Hope it helps!
Answer:(125-81.25)/125 = 0.35 = 35%
Step-by-step explanation:
Answer:
A^4xb^6
Step-by-step explanation:
Answer: 
Step-by-step explanation:
We know that the general form of the exponential decay formula is
, where y is final amount remaining after t time, A is the original amount and r is the rate of decay
Now, the ratio of strontium-90 remaining, p , as a function of years, t , since the nuclear accident. 
Hence, the ratio of remaining since the nuclear accident is 