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해법
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Translate the problem into an equation:
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The radius of a circle is 17 in. Find its 원둘레 in terms of pipi.Twenty-eight is four times a number xJack is 7 times as old as his brother Jacob. Next year she will only be 5 times as old as him. How old is Jacob now?Martha invests 7700 in a new savings account which earns 5.2% annual interest, compounded quarterly. What will be the value of her investment after 4 years? Round to the nearest cent.The 원둘레 of a circle is 25.12 yards. What is the circle's radius?