exam Maths Puzzle Numerical Ability

ISBN0618372628

One angle in a triangle is a right angle, and one angle is equal to 30. What is the measurement of the third angle?

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I am not sure if you would use the foil method to answer this question or not.
(2x-y)*2. (*2 means squared)
I am confused on this question. I would really appreciate your help. Thanks fill in the chart given this linear equation:
y=-7x-4