Angles j and k are supplementary angles. What is m∠k if m∠j=34° ?

Since angles j and k are supplementary, the sum of their measures is 180°. So,

m∠j + m∠k = 180°
34° + m∠k = 180°
m∠k = 180° - 34°
m∠k = <<146=146>>146°. Answer: \boxed{146}.