Answer:
( 5/2, 2 )
Step-by-step explanation:
Solve by substitution method:
Solve for :
Substitute for in :
∴ and
<em>hope this helps....</em>
I think the answer is 99.6. I'm sorry if it's wrong.
The answer is the last option, f(x) = 0.8 * (2^x)
The first strong indicator is that the fourth pair of data (0, 0.8) indicates that f(0) is 0.8
Given that a^0 = 1, means that the coefficient of the function has to be 0.8 and you discard the first and the third options, because for them two f(0) = 2.
AT the end what you have to do is to replace the values of x in equations and compare the results.
So, for the fourt opion you get:
x f(x) = 0.8 * (2^x)
-2 0.8 * (2^-2) = 0.8 / 4 = 0.2
-1 0.8 * (2^-1) = 0.8 / 2 = 0.4
0 0.8 * (2^0) = 0.8 * 1 = 0.8
1 0.8 * (2^1) = 0.8 * 2 = 1.6
2 0.8 * (2^2) = 0.8 * 4 = 3.2
As you can see this results are the same of the table of the question, so the function is f(x) = 0.8 (2^x).
-9x - 5 = -95
-9x = -95 + 5
-9x = -90
x = -90/-9
x = 10
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