He will have to pay 819 dollars because you have to multiply 9 times 13 which is 117 and it's 7 dollars per square foot so 117 times 7 which is 819 so he will pay for the wall $819 dollars
We have been given that the record low temperatures for a town in Maine are −20°F for January and −19°F for February.
We know that while comparing two negative numbers, the more negative number is more away from zero. So more negative number would have less value than comparatively less negative number.
Since −20°F is 20 units below zero, so it will have less value than −19°F, which is 19 units below 0.
Therefore, our required order would be −20°F, −19°F.