From Gonzalo: This is not precisely a maths question, but it is formulated based on my maths curiosity. Fidgetting with my new graphic calculator, I started graphing things and had the idea to graph $y=(-2)^x.$
The result surprised me, and I thought a little bit about it, stored it on the back of my brain, and promised myself to look deeper into it someday. Answered by Harley Weston.
From LANELL: this is a problem to solve: 1/3 + 2/7 >=x/21 -- part of the answer is (-oo)
not exactly that similar--it is on a calculator as a symbol- sure you know what it is I am talking about- the x will be a number Answered by Penny Nom.