Answer:
im not in high school sorry
Step-by-step explanation:
For this case we have a function of the form:

Where,
A: initial population of bacteria
b: growth rate
x: number of hours
Since the diameter is double every hour, then:

We must now look for the value of A.
To do this, we evaluate an ordered pair of the graph:
For (1, 2):

Clearing A we have:


Then, the function is given by:

For after 9 hours we have:

Answer:
the diameter of the bacteria after 9 hours is:

The expression should be $20.00-($0.40p)=change recieved
each gallon has 8 pints
4
* 8 = 36
so there would be 36 servings
Well i can help you with one more which is 9x*3x/9x Since 9*3=27 so 9x*3x=27x Then the 9x is still there ending up with 27x/9x which is your starting fraction :)