Find the inverse of
1 -7 -1 -6
-6 -7 -1 -1
-1 7 1 -6
-6 7 1 -1

correct answer:

b.(19,-2)

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:

30 people weigh 160 pounds or more