Question

Yesterday the temperature at noon was 9.17ﾟF by midnight the temperature had decreased by 13.4ﾟ what was the temperature of midnight

Answer 1

Your answer is -4.23 degrees fahrenheit.

To get that answer you must take you starting temperature, 9.17, and your decreased amount of temperature, 13.4, and subtract them.

So, you have 9.17 - 13.4 = -4.23

You can not reverse the numbers or it will give you the wrong answer.