Angles a and b are supplementary angles. What is the value of m∠a if m∠b=43° ?(1 point) Responses 137° 137 degrees 223° 223 degrees 47° 47 degrees 43° 43 degrees
Since angles a and b are supplementary angles, the sum of their measures is 180°. Therefore, if m∠b = 43°, then m∠a = 180° - 43° = 137°.
The correct answer is 137°.