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Answer:
approximately 27.5 million
Step-by-step explanation:
If 1990 is the initial year, we will rename it as 0. This is the x coordinate in a pair we will need to write the equation that models this particular situation. The y coordinate that goes along with it is 21.7 (x is time in years, y is number of people). The next coordinate pair we have is (6, 25). If 1990 is year 0, 1996 is year 6.
The standard form for an exponential equation is
where y is the number of people, x is the number of years gone by, a is the initial value, and b is the growth rate. We fill in equation 1 with the x and y coordinates from coordinate pair (0, 21.7):
andything rised to the power of 0 = 1, so b raised to 0 = 1:
21.7 = a(1) so
a = 21.7
Now we use coordinate pair (6, 25) in equation 2, subbing in our value for a also:
Divide both sides by 21.7 to get
We "undo" that power of 6 by taking the 6th root of both sides:
That gives you that
b = 1.0238 (rounded).
Now that we have a and b, we can write the model for this situation:
Now that we have the model, we can find y when x = 10 (2010):
First raise 1.0238 to the 10th power to get
y = 21.7(1.266097) and
y = 27.47