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:
To move from the point (0,0) to the point (6,9) we move up 9 units and right 6 units.
Slope = rise/run
Slope = change in y / change in x
Slope = 9 / 6
Slope = 3/2
If they go golfing on the same day again your answer will be
42)
Add 1/6 teaspoon and 1/8 teaspoon. The LCD here is 24, so we're adding
4/24 to 3/24, obtaining 7/24 (teaspoon of pepper, total).