Answer:
y = 5 e^r * t
Let y be the population in billions and t the value of elapsed years
7 = 5 e^r * t is the equation being used where t = 15
7/5 = e^r * t
ln 7/5 = r * t taking ln of both sides
r = .336 / 15 = .0224
y = 5 e^(.0224 t) is then our equation
Check - suppose you want y at 2020
y = 5 e^(.0224 * 20) would be the equation
y = 5 e^.449 = 7.83 billion - seems to be a reasonable answer
A.
Step-by-step explanation:
To find out the answer, there is a method that can be used to find out if a line is a function. It is called the vertical line method. And it also has to be per x, One y value has to be there. Analyzing the graphs, the answer should be option A.
Answer: 
<u>Simplify both sides of the equation.</u>
<u></u>
<u></u>
<u></u>
<u>Add 4x to both sides</u>
<u></u>
<u></u>
<u></u>
<u>Subtract 8 from both sides</u>
<u></u>
<u>Divide both sides by -3</u>
<u></u>
<u></u>
