Which is the Graph of f(x) = 100(0.7)x?
Answer :
Correct Answer: B.
As the Function f(x) = 100(0.7)^x , it can also be written as y = 100(0.7)^x because we know that y=f(x):
So put the value of x =0 in the given function we get
y = 100(0.7)^x
y = 100(0.7)^0
y = 100(1)
y = 100
So (x=0,y=100) is one coordinate on the graph
Same as, If we put x =2 we get
y = 100(0.7)^x
y = 100(0.7)^2
y = 100(0.49)
y = 49
So (x=2,y=49) is the second coordinate on the graph
Which satisfies the graph B.
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