(a) see figure a above,  In the diagram, MN || ST, NP || QT and < STQ = 70°. Find x.

(b) see figure b above,  In the diagram above, AC is a straight line, |BC| = |BD|, \(\stackrel\frown{BCD} = 50°\) and \(\stackrel\frown{BAD} = 55°\). Find \(\stackrel\frown{BDA}\).