exam Maths Puzzle Numerical Ability

One of the angles of a triangle measures 53 degrees. Another angle measures 37 degrees. What is the measure of the third angle?

Instructions: Define a variable, write an equation and solve the problem.

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exam Other Question

I am having a hard time understanding the following equation;
(-2)(4)+5-6-[-2]
________________= ?
(-2)[9+(-5)]

What are the [] brackets used for in the equation? This is one equation.

thanks........ find a quadratic function with vertex (4,-5) and containing the point (-3,1). Give you solution in the form f(x)=a(x-h)^2+k