Question

A chef knows that ground beef used for hamburger is safe to eat once it reaches 160 degrees Fahrenheit. For optimized taste

and safety, he will not allow a hamburger cooked to a temperature under 160 degrees or over 170 degrees to be served. Which
graph represents the conditions under which the chef will not allow the hamburger to be served?

Answer 1

First graph

Explanation:

see the attached figure to better understand the problem

Let

x -----> the temperature in degrees Fahrenheit

we know that

The chef allow a hamburger cooked to a temperature in the interval

[160,170]

so

All real numbers greater than or equal to 160 degrees Fahrenheit and less than or equal to 170 degrees Fahrenheit

therefore

Verify each graph

First graph

Include temperatures under 160 degrees or over 170 degrees

therefore

This graph represents the conditions under which the chef will not allow the hamburger to be served

Second graph

This graph include the temperatures of 160 degrees or 170 degrees

therefore

This graph represents conditions under which the chef will allow the hamburger to be served

Third graph

This graph represent the interval [160,170]

therefore

This graph represents conditions under which the chef will allow the hamburger to be served

Fourth graph

This graph represent the interval (160,170)

therefore

This graph represents conditions under which the chef will allow the hamburger to be served