What's happening is that every subtraction can be written as "addition of the opposite."
18-5 = 18 + (-5)
One reason this is done in the work you showed is that they're trying to show why you distribute the negative and the 1 into the parentheses, why you multiply everything in the parentheses by "-1" and not just 1.
The other reason is to later to be able to move the individual terms around, so you'll be able to combine like terms.
When you move terms around, the sign has to stay attached to the term, so writing all the subtractions as addition helps keep the sign attached.
700/200=7/2 because devide by 100 and then=3 1/2 and half is .5 so=
3.5
Answer:
48
Step-by-step explanation:
i counted 24 2's and 24 x 2 is 48 also i did the math
Answer:
Each teacher will have 21 students
Step-by-step explanation:
273 divded by 21 = 21
Answer:
15
Step-by-step explanation:
