Convex quadrilaterals have a total of 360* when you add up all the angles. But you have to remember that convex angles are always 180* or less. This means that angles A, B, and C are all convex. If you add all the given angle measurements you get 248*. 360-248= 112*. So, your answer is C.
The measures of the interior angles of a quadrilateral add up to 360 degrees, so make angles A, B, C, and x add up to 360 in an equation and solve for x, the missing angle.
It could be 3 and lower because if you - 7 from -10 you get -17 then your equation would be -5x< -17 than you divide -17 by -5 and get 3.4 than your equation is x < 3.4 so your answer is 3.4 or below.
