I need help please! I don’t understand what to do. How do I find the measure of that angle? I will give brainlist

For the equations below which statement is true ? -2x=14 6x=-42

What is the result of adding the system of equations? 2x+y=4 3x-y=6

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c