Answer:
1
Step-by-step explanation:
2(5)/3^2 + 1 =
10/9 + 1
10/10 =
1
Answer:
x=6
Step-by-step explanation:
5x+9-3x=21
5x-3x=21-9
2x=12
x=6
Expand to get 35x^3+49x^2-20x-28
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: