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# d interest, A=P(1+ i) n , how long would it take an investment of $10 000, at an annual interest rate of 7% per year, compounded quarterly, to triple?...

1) Using formula for compound interest, A=P(1+ i)n, how long would it take an investment of $10 000, at an annual interest rate of 7% per year, compounded quarterly, to triple?

2) What is the exact value of 2x+1= 17x.