As given by the question
There are given that the value -17 degrees and greater than 10 degrees.
Now,
-17 is close to -20 so:
[tex]-20+20=0[/tex]Then,
It says that the value was greater than 10
So,
[tex]0+10=10[/tex]Then,
The temperature of the change to noon is :
[tex]20+10=30[/tex]Hence, the temperature is about 30 degrees.