exam Maths Puzzle Numerical Ability

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c to 4th power d fifth power ad to -1 power a to 9th power c to 3rd power.

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Find sec &#920; if tan &#920;=1/4 aand 180º<270º.

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Suppose that N=squareroot(x)+3 models the number of cases of an infection, in millions, of a disease x years from now.Approximately how many cases of the infection will there be 9 years from now? approximately how many years will there be 5 million cases