Attached you will see the answer (use polynomial division)
-13+21=14
The temperature is 14 degrees during your afternoon.
The most familiar case is that where you see a " + " sign between two numbers; that's an indication to add the two numbers (or terms) together.
Also, the instruction, "sum up the following," is a command to find the sum of all the numbers that follow.
5 divide by 30 equals 6.12 minus 6 equals 6 so she has to make at least 6 pies.
