1) In 2000, there were approximately 109 million cell phone users in the United States. The number of cell phone users grew to approximately 189 million after one year. a) Write an exponential model that represents the number of cell phone users in the United States, where t represents the number of years after 2000.

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b) What is the average rate of change?

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c) What would be the number of cell phone users in 2020?

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation:

he is going to fill two shelves and the third shelf will only have five video games

if your equation is in the form ax2 + bx + c, you can find the maximum by using the equation:

max = c - (b2 / 4a).

the first step is to determine whether your equation gives a maximum or minimum.

-x2 + 4x - 2.     thats an example hope it

is the answer 0.2

is that one of the options