I TYPED IN THE ANSWER CAN SOMEONE CORRECT IF IT IS WRONG?

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

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Two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: what is the approximate distance, in feet, between the two poles? 6.93 feet 8.66 feet 12.32 feet 15.59 feet