Anwser is B i took the test
Answer:28.2753
Step-by-step explanation:
The equation will be of the form:

where A is the amount after t hours, and r is the decay constant.
To find the value of r, we plug the given values into the equation, giving:

Rearranging and taking natural logs of both sides, we get:


The required model is:
Answer:
Step-by-step explanation:
as the product of 90 degrees and 20 degrees
30x60=1800
90x20=1800