The table below shows some inputs and outputs of the invertible function f with domain all real numbers.

Step-by-step explanation:

A function and its inverse has the following properties

This implies that;

From the table,

This means that:

Note that: f(7) means the value of f(x) when x=7.

From the table f(x)=-6 when x=7.

That is why f(7)=-6.

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315