Answer:
3. x-2
Step-by-step explanation:
Let's start with 1. we know that 2-x is the same as -2+x and since addition can be written as -2+x or x+(-2) and equal the same thing, we know that x-2 is the one that is not equivalent.
R = 4 cm
A = pi * r^2
51 = 3.14 r^2
r^2 = 51/3.14
r^2 = 16
r = 4 cm
*Note:- neglect the diameter of the the larger circle
-8
-6+(-2)
-6 - 2
= -8
