Answer:
After 5 hours.
Explanation:
To find out when the temperature will be below 32°F, you can set up an inequality based on the given information. The temperature starts at 50°F and decreases by 4°F each hour. You want to know when it will be below 32°F, so you can write:
Temperature < 32°F
Now, let "h" be the number of hours, and since the temperature decreases by 4°F per hour, you can write:
Temperature = 50°F - 4°F * h
Now, substitute this expression into the inequality:
50°F - 4°F * h < 32°F
Next, solve for "h":
-4°F * h < 32°F - 50°F
-4°F * h < -18°F
Now, divide both sides by -4°F, remembering to reverse the inequality since you're dividing by a negative number:
h > (-18°F) / (-4°F)
h > 4.5
Since the number of hours, "h," represents a whole number of hours, we need to round up to the nearest whole number because it cannot be a fraction of an hour.
So, it will take more than 4.5 hours for the temperature to be below 32°F. Therefore, it will be below 32°F after 5 hours.