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해법
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Find the area of a 원형 with a radius of 21 inches.find the 원둘레 of a circle with an area of 615.75the product of pragati,s age 2 years ago and 3 years hence is numerically 84 find her present agePedro opened a savings account 8 years ago. The account earns 7% interest, compounded monthly. If the current balance is 800.00, how much did he deposit initially?28 percent of what number is 840