exam Maths Puzzle Numerical Ability

Please help me I am having problems with these kinds of problems.
sqrt 7{{{2 sqrt 3 + 3 sqrt 7)}}}

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exam Other Question

directions: find the roots of the quadratic equation y=x^2+3x+2 by factoring. choose the correct answer. A)1,-2 B)-2,-1 C)0,-2 D)1,-1. which one is correct? I have no idea how to do this. Please help.

Graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on the graph.

4.2x + 3.8y = 1.9