book Maths Puzzle Numerical Ability

please help me on this question-- im terrible at math!

the spoke of a wheel reaches from the center of the wheel to its rim. If the circumference of the rim of the wheel is 42 inches, How long is each spoke? Round the answe to the nearest hundreth

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The simple interest earned on a pricipal of three hundred dollars at an annual interest rate of x percent is less than or equal to seventy-two dollars

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