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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 chu vi of a circle is 25.12 yards. What is the circle's radius?cosh(9) :Enter a number: