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
The Answer is False. It is false because on line has a slope of 0 and the other has an undefined slope.
Hope this helps, Good luck!
Answer:
3 weeks
Step-by-step explanation:
She has 135 hours. A work day is 7.5. The three days for the wedding would use 7.5 * 3 hours or 22.5. 135 - 22.5 equals 112.5. To find out how many days, divide 112.5 by 7.5 to get 15. Then, because she works 5 days a week, divide 15 by 5 to get your answer of 3 weeks.
