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Reptile [31]
3 years ago
5

Which of these statements is true for f(x)=3•(9)^x

Mathematics
2 answers:
svlad2 [7]3 years ago
8 0
A. The y-intercept is (0,3)
max2010maxim [7]3 years ago
4 0

Answer:

Option A is the correct choice.

Step-by-step explanation:

We have been given an equation f(x)=3\cdot (9)^x. We are asked to choose the correct statement about our given equation.

Let us see our given choices one by one.

A. The y-intercept is (0,3).

Let us find the y-intercept by substituting x=0 in our given equation.

f(0)=3\cdot (9)^0

f(0)=3\cdot 1

f(0)=3

Since the y-intercept of our given equation is (0,3), therefore, option A is the correct choice.

B. It is always decreasing.

We can see from our given equation that our given function represents exponential growth, where growth factor is 9, therefore, option B is not correct.

C. The domain of f(x) is x>0.

Since our function is defined for all real values of x, therefore, the domain of function is (-\infty,\infty) and our given statement is not true.

D. The y-intercept is (0,1).

Since the y-intercept of our given equation is (0,3), therefore, option D is not a correct choice.

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