The answer is: [B]: "False" .
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Answer:
18.8
14+12+21+26+19+15+22+17+24+18 = 188 188/10
I don't remember how to do stem and leaf plots.
Yes you are correct. An equilateral triangle would combine with the dodecagon (12 sided polygon) and the square to help tessellate the plane.
So 3 times a number is between -18 and 18
between means it cannot be -18 or 18 so
3 times x=3x
x=unknown
3x
< less than
>greater than
if it is between -18 and 18 then the number is >-18 and <18 so
-18<3x and
18>3x
divide both equations by 3
-6<x
6>x
combine
-6<x<6
solution set=(x|-6<x<6)