Find two numbers, if their sum is −11 and their difference is 41

15 and -26

Step-by-step explanation:

the fist # = x

The 2nd # = y

equation:    x + y - 11 = -x + y - 41

                           + 11   +x  -y  +41  

                                  2x=30

                                     x=15

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: