Problem page rachel purchased a prepaid phone card for $15 . long distance calls cost 23 cents a minute using this card. rachel
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Draw a number line. Plot -1 on the number line and make this a filled in circle. Shade to the right of the filled in circle to indicate the set of values x such that
So x could be -1 or it could be larger. The fact that x = -1 is possible is why we have a closed or filled in circle (instead of an open hole) at this endpoint.