What number should be added to -79 to get a sum of -59

Let x be the unknown no.

Now,

.°. x= 20

Hence, 20 should be added to -79 to get -59

3

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: