Question

9. Explain why there is a closed circle at point (1, 0.90) on the graph

10. Explain why there is a open circle at point (1, 1.10) on the graph

11. Explain why there is a open circle at the point (0, 0.90) in the graph

12. Could there be two different closed points with the same input value on the graph of a function? Explain

Answer 1

9

Because the cost of postage is up until and include 1 oz.

10

Because this next price of $1.10 only is used if you are over 1 oz in weight.

11.

Because you can't mail something that doesn't have any weight at all. If there's no weight, there's no envelope.

12.

No. It wouldn't pass the vertical line test. The function would indicate two different prices for the same weight, which doesn't work.