exam Maths Puzzle Numerical Ability

Please Help! How do you solve the equation
m - 2n = 9 if the domain is {-1, 0, 5}.

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exam Other Question

Hi, ive been asked to answer the following questions, and having great difficulty, i have managed to answer the first question, (although with ALOT of help), but i was wondering if a right triangle has a 123 foot hypotenuse, and a 38 foot leg. to the nearest tenth of a degree, what are the sizes of its acute angles?

thank you