book Maths Puzzle Numerical Ability

express sec -123 degrees as the same function of a positive acute angle.

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book Other Question

How do i "factor Each polynomial"? I have 3 Questions.
#1- 45x^4-5y^4 - forty-five X to the fourth power minus five Y to the fourth Power

#2- 48a^5y-147ay^7 - Forty-eight A to
John owns a hot dog stand. He has found that his profit is represented by the equation P=-x(squared)+70x=76, where P represents profits and x represents the number of hot dogs sold