Lời Giải
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Two years ago, Jernie was three times as old as his sister, Cecile. In 4 years, he will be only twice his sister's age. Find their present ages.Twice the hiệu between a number, x, and thirty-six is three times the numberA toy ball can be modeled as a sphere. Alejandro measures its bán kính as 4.9 cm. Find the ball’s volume in cubic centimeters. Round your answer to the nearest tenth if necessary.A person invests 1000 dollars in a bank. The bank pays 7% interest compounded quarterly. To the nearest tenth of a year, how long must the person leave the money in the bank until it reaches 3400 dollars?a number increased by 12 is 20