Which of the following is always irrational? the sum of two fractions
the product of a fraction and a repeating decimal
the sum of a terminating decimal and the square root of a perfect square
the product of a repeating decimal and the square root of a non-perfect square

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

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What is the missing step in this proof ?