Which is the Graph of f(x) = 100(0.7)x?

Answer :

which function is fx

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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