A scientist uses 2.8*10^12 cells in one experiment, which is 2,000 times the number of cells she uses in a second experiment. Wr
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A solid dot on the graph of an inequality indicates that the number is contained within the inequality, so yo should use 
or 
to represent that situation, whereas a white dot indicates that the number is not contained within the inequality.
Our graph is telling us that
is greater or equal than -1, and also is less than 3. So our inequality will be:
Our graph is telling us that