no i thought they were triangles
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A stop sign is shaped like an octagon.
A yield sign is shaped like an upside-down triangle.
"Regulation sign" Reference: It is regulating something. Failure to obey these signs can result in a traffic citation.
numbers with Like signs : result Plusnumbers with Unlike signs : result Minus
Yes. A negative subtracted by a negative is a positive. Just remember that two like signs become a positive sign, and two unlike signs become a negative sign.