exam Maths Puzzle Numerical Ability

Can someone help me on this problem?
I need to add:
2 + (-11) + 14 + (-7)

Thanks,
Lisa

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exam Other Question

Two cars leave from a town at the same time traveling in opposite directions. One travels 5 mph faster than the other. In 3 hours, they are 267 miles apart. How many mph is each car traveling? I know Distance = rate * time.
Solve by completing the square

x^2=5x+2

Any help is appreciated