Question

At 9:00 am, the temperature at an Arctic observatory was -12 degrees F. By 5:00 pm, the temperature had risen 5 degrees. Over the next three hours, the temperature had dropped 2 degrees. What was the temperature at 8:00 pm?

A) -9 degrees F

B) -10 degrees F

C) -15 degrees F

D) -5 degrees F

Answer 1

The temperature at the Arctic observatory was -12 degrees F at 9:00 am, rose to -7 degrees F by 5:00 pm, and dropped to -9 degrees F by 8:00 pm.

Step-by-step explanation:

At 9:00 am, the temperature at an Arctic observatory was -12 degrees F. By 5:00 pm, the temperature had risen 5 degrees to -7 degrees F since a rise in temperature means we add 5 to -12. Over the next three hours, the temperature had dropped 2 degrees, leading to a temperature of -9 degrees F at 8:00 pm, since a drop in temperature means we subtract 2 from -7.

Therefore, the temperature at 8:00 pm was -9 degrees F, which corresponds to option (A) -9 degrees F.