Question

The table shows the cost of some apples. Which function f * x is represented in the table?

Answer 1

As you notice, 1 apple costs $2

therefore, 2 apples will cost $4

and 3 apples will cost $6

Let x be the number of apples

`f(x)=ax`

where a is a constant number.

Substitute x = 1 and f(x) = 2

`\begin{gathered} f(x)=ax \\ 2=a(1) \\ a=2 \end{gathered}`

And you will get a = 2

So the function will be :

`f(x)=2x`

The answer is Choice D f(x) = 2x