Step-by-step explanation:
an open (empty) point means the point itself is not included.
a closed (filled) point means the point itself is included.
the x values going from -3 (not included) to -1 (included) means
-3 < x <= -1
so, the second answer is correct.
<em><u>The question is the base of the triangle, so we use the formula : b²=c²–a²</u></em>
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Answer:
he gained 2,100
Step-by-step explanation: