book Maths Puzzle Numerical Ability

Could someone help me solve this problem?

Find the circumference of 3.75 ft. Use 3.14 for pie and round your answer to one decimal place.
Thanks!
Sher

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book Other Question

If Cathy had earn one fourth of a percent more in annual interest on an investment, the interest for one year would have been $85 greater. How much money did she invest at the begg x^3-27=(x-3)(x-3)(x-3)
Did I do the problem right? He wanted me to factor completely.