An absolute value graph is an example of a non-linear graph. true or false?

4 + 5 7/9= 9 7/9

step-by-step explanation:

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

it would open into a square depending on the type of envelope i’m not sure about the second part