Hello from MrBillDoesMath!
Answer:
-10w - 20
Discussion:
5 ( -2w - 4 ) =
5(-2w) - 5(4) =
-10w - 20
Thank you,
MrB
If 6 of the 13 books are new, then 7 of them are used. The ratio of new (6) to used (7) is
6:7 or 6/7
Ratio of all books (13) to used books (7) is
13:7 or 13/7
The answer is definitely 7xf
20, 180 - 20, 180 + 20 and 360 - 20
i.e. 20°, 160°, 200° and 340°