Final answer:
The temperature difference between Death Valley, CA, and Island Prudhoe Bay, Alaska, on February 17th, 2015, was 117 degrees Fahrenheit.
Step-by-step explanation:
The difference between two temperatures is found by subtracting the lower temperature from the higher one. On February 17th, 2015, the temperature in Death Valley, CA, was 86 degrees Fahrenheit, and the temperature in Island Prudhoe Bay, Alaska, was -31 degrees Fahrenheit. To find the difference, you subtract -31 from 86:
Temperature Difference = 86°F - (-31°F) = 86°F + 31°F = 117°F
This calculation shows that the temperature difference between these two locations was 117 degrees Fahrenheit on that date.