book Maths Puzzle Numerical Ability

Solve the equation 1nx=4. Round the answer to four decimal places.

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book Other Question

The cost in dollars of manufacturing w wing nuts is given by the expression 0.07w + 13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut? 2
8X + 58X+ 60 = 0