Find the total cost: $20 meal; 7% sales tax; 20% tip (do the tip before tax)
1 answer:
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Simplify and solve quadratic equation:
So numerically the only solution is x=-4.
However, mathematically, there are two solutions, {-4,-4}, or x=4,multiplicity 2.
So numerically the only solution is x=-4.
However, mathematically, there are two solutions, {-4,-4}, or x=4,multiplicity 2.