The amount remaining A, in grams, of a certain radioactive is measured at monthly intervals and recorded in the table below.
t0123 A73.0059.1347.9038.80?
A: Make a table of successive ratios to show that the amount remaining of the radioactive substance can be modeled by an exponential function. Round your answer to two decimal places.B: Find an exponential model for the data. Round your answer to one decimal place.C: Plot the graph of the data points along with the exponential model. Include up to 10 months.D: According to the model, what is the half-life of this substance? That is, how long will it take for half the substance to decay? Round your answer to two decimal places.
What will be an ideal response?
?
| Time increment | From  to  | From  to  | From  to  |
| Ratios of A |  |  |  |
?
B: 
C:
D: 3.29 months
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