exam Maths Puzzle Numerical Ability

Determine the maximum possible number of turning points for the graph of the function:
f(x)= x to the fifth power + 2x to the sixth power

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exam Other Question

Mike, louie and Joy can mow the lawn in 4,6, and 7 hours, respectively. What fraction of the yard can they mow in hour if they work together? Soy bean 16% protein; corn meal 8% protein; How many pounds of each should be mixed together in order to get 320-lb mixture that is 11%protein.