exam Maths Puzzle Numerical Ability

Evaluate: 70 � 7 - 15 � 5

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if sin x= 8/17, where 0 degree < x < 90 degree, determne the exact vaule of cos (x + 180) I have worked this problem several times and I have had someone else look too, and we are not finiding the same answer. I am thinking we hace did soethign wrong. Can you please hel