AIR MATH

Math Question

13. In isosceles triangle \( H M S, \angle M \) is the vertex angle. If \( m \angle M=(2 x+6)^{\circ} \) and \( m \angle H=(9 x+7)^{\circ} \), what is \( m \angle M \) ? A. \( 10^{\circ} \) B. \( 22^{\circ} \) C. \( 79^{\circ} \) D. \( 80^{\circ} \)

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