exam Maths Puzzle Numerical Ability

if sin x= 8/17, where 0 degree < x < 90 degree, determne the exact vaule of cos (x + 180)

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Can I please get assistance with the following problem?

factor f(x) into linear factors given that k is a zero of f(x)
f(x)=x^3-6x^2-25x+150;k=5

THANK YOU!! Evaluate: 70 � 7 - 15 � 5