Question

The temperature at 9:00am was -15°F. It rose 10°F by 1:00pm. At 8:00pm, the temperature dropped 20°F. What was the temperature at 8:00pm?

1. -25°F
2. 25°F
3. 15°F
4.-15°F​

Answer 1

option 1

Explanation:

note that

• a rise in temperature is + ( addition )

• a drop in temperature is - ( subtract )

given

temperature at 9.00 am was - 15° F

it rose by 10° F at 1.00 pm

temperature at 1.00 pm = - 15° F + 10° F = - 5° F

it then dropped by 20° F at 8.00 pm

temperature at 8.00 pm = - 5° F - 20° F = - 25° F