Question

I need to know what question 3 and 4 is

Answer 1

3. (-∞, ∞), [0, ∞); The graph is a function

4. -5

Explanation:

Question 3

A. Domain

The domain is the set of all possible x-values that will make the function work.

x can take any value from -∞ to ∞

The domain is (-∞, ∞).

B. Range

The range is the spread of the y-values.

We see from the graph that y can have any positive value.

The range is [0, ∞).

C. Test for function

We can use the vertical line test to determine if the graph is that of a function. A function can only have one value of y for each value of x.

We see that a vertical line from any point on the x-axis will intersect only one point on the graph.

The graph is a function.

Question 4

ƒ(x) = -2x+ 1

`\begin{array}{rcl}f(3) & = & -2(3) + 1\\& = & -6 + 1\\& = & \mathbf{-5}\\\end{array}`