Which of the following expressions are equivalent to
-13
12
Choose all answers that apply:

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:

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed