Answer:
Thus every real number other than zero is either positive or negative, while zero itself is not considered to have a sign. Positive numbers are sometimes written with a plus sign in front, e.g. +3 denotes a positive three.
use circle equation,
center = 5, -1
radius = 2
21, 22, 24, 25, 26, 27, 28,
8
round each number to the nearest 10, then
640 ÷ 80 = 8 ← estimate
7a+b-9c+17d
Step-by-step explanation:
-5 ( a-2b+3c -4d) - (-3) (4a -3b+2c-d)
Distribute
-5a+10b-15c+20d+12a-9b+6c-3d
Combine like terms
