Mark recorded the temperature each day for a week. He calculated the mean temperature and found it was 21.6°C
Mark’s thermometer was not working properly. All seven temperatures were 3° too high.
Write down the correct mean temperature.

Step-by-step explanation:

130.2/7= 18.6

Before finding the correct form you need to find their total sum and subtract 21 from it since the number of temperature recordings are 7

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )