book Maths Puzzle Numerical Ability

6y^2-41y-7
( 6y-1)(y-7)

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book Other Question

Nan can rent a van for either 50 dollars per day with unlimeted mileage or 35 dollars per day with 75 free miles and an extra charge of 20 cents for each mile over 75 miles. For w What is the derivative of ln(ln(x))?