9units sorry for not showing work though but glad I can help
39.50-23.76-2.57-1.49=11.68
take the sales and subtract the expenses
First you gotta distribute.
4 (1.75y - 3.5) + 1.25y
4 * 1.75 y = 7
4* (-3.5) = (-14)
7y - 14 + 1.25y
Combine like terms
8.25y - 14
Well all u have to do is minus -6 from 23 so 23-6 is 17. Then all u have to do is add 0+17 so ur answer is the temperature changed 17 F
Area= base + base / 2 then multiply the height.
Example: 6+7 /2*6= 39
