exam Maths Puzzle Numerical Ability

How long will it take an investment to double compounded continuously at 6%?

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exam Other Question

Directions are to solve this problem: the area of a rectangle is 256 m^2. The length of the rectangle is 4 times greater than the width. What are the length and width of the rectangle? My answer to this was L=32 and W=8. Am i correct? Solve for x:
(A.) Log(base 5)7 + log(base 5)8 = log(base 5)(2x-4)

(B.) Log(base 3) (x+1) - log(base 3) x = log(base 3) 15

(C.) (3/4)log(base 10) 10,000 = x