exam Maths Puzzle Numerical Ability

How do I proof that ALL Right Angles Are Congruent?

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it takes a painter A 3 hrs to paint a certain area of a hhouse.it takes painter B 5 hrs to do the same job.how long would it take them,working together,to do the painting job? im hoping someone can help me, factor the polynomial by factoring out the negative of the GCF -24x4y3+30x2y3