Answer:
Step-by-step explanation:
8x²-x-8
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 
A place I go to graph is go to desmos. It works well for this. All you have to do is snip the picture of your graph
A. $1589.01
I solved this by a simple trial and error by inputing each answer into the equation.