Can somebody me find the missing one

The one missing is the fourth choice.

As you can see, the x axis stands for the weight, and the y axis the total cost.

You can see that the point, (1, 4) definitely exists.

So basically it would be 1 pound of cheese for four dollars, since x is weight and y is total cost.

You can see the fourth choice states that it's four dollars for one pound of cheese.

Hope this helped :)

Number nine is f(x)= 40x : ) hoped i ya