Answer: A) The initial number of bacteria is 350.
Step-by-step explanation:
Exponential growth equation:
, where A=Initial value, r= growth rate. (i)
Given: A bacteria sample can be modeled by the function
which gives the number of bacteria in the sample at the end of x days.
Here, 
Compare this equation to (i) , we get A = 350 and r= 0.20 = 20% (growth rate)
So, the best interpretation of one of the values in this function are:
A) The initial number of bacteria is 350.
Answer:
90/200
Step-by-step:
Kahn Academy marked it correct
Step 1 ) Move all terms right side of the equation.



Step 2 ) Apply quadratic formula. (Note: There are 2 solutions)



,

Step 3 ) Simplify.
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,

Since the options only provide one of the answer we found, the answer is...

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- <em>Marlon Nunez</em>