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The 차이 of the square of a number and 40 is equal to 3 times that number.The area of a circle is 25𝜋 square feet. What is the 지름?Perry made 720 in interest by placing 6,000 in a savings account with simple interest for 2 years. What was the interest rate?how much money will you have in 8 years if you invest \$4000 at 3.5% compounded quarterly9 times a number, decreased by 4