Book Maths Puzzle Algebra

What is the square feet of a triange with sides measuring 207.4 feet, 199.51 feet, and 40 feet?

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Book Other Question

After robbing a bank, the robber gallops off at 14 mi/h. Ten minutes Later the marshall leaves in hot pursuit at 16 mi/h. How long does it take the marshall to catch up with the if the square of a number is subracted from seven times the number, the difference is 12. What is the number?