# SOLUTION: Please help w/pre-test for final. Find f^-1 (x), if it exists, for f(x) = 6x+5 Find the total amount of money in an account if \$8000 was deposited 6 years ago at 2% interest co

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 Click here to see ALL problems on logarithm Question 114082: Please help w/pre-test for final. Find f^-1 (x), if it exists, for f(x) = 6x+5 Find the total amount of money in an account if \$8000 was deposited 6 years ago at 2% interest compounded semi-annually. Answer by stanbon(57407)   (Show Source): You can put this solution on YOUR website!Find f^-1 (x), if it exists, for f(x) = 6x+5 You have y = 6x+5 Interchange x and y to get: x = 6y + 5 Solve for y: y = (1/6)x -(5/6) -------------------------- Find the total amount of money in an account if \$8000 was deposited 6 years ago at 12% interest compounded semi-annually. A(6) = 8000(1+0.12/2)^(2*6) A(6) = 8000(1.06)^12 A(6) = 8000*2.012196 A(6) = \$16,097.57 ======================== Cheers, Stan H.