On Tuesday in Nome, Alaska, the temperature started at −6ºC and reached a high of 3ºC. By how much did the temperature rise throughout the day?
1 answer
To find the amount by which the temperature rose throughout the day, subtract the starting temperature from the highest temperature: 3ºC - (-6ºC) = 3ºC + 6ºC = <<3+6=9>>9ºC. Answer: \boxed{9}.