Please help with these four Geometry questions! It'd be very much appreciated.

Which expression is equivalent to 5r6141 2r+st6

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.