The exterior angle theorem states that an exterior angle is equal to the sum of its remote interior angles.
With that we know...
m<QRS+m<RSQ=m<SQP
90+34=x+72
124=x+72
x=52 degrees
answer: 52 degrees
Option B;
A suitable x-coefficient for a quadratic function that factors into a perfect square has to be even.
To solve this you can make a proportion where the matching sides will correspond to each other. It should look something like this:


Now you must cross multiply
10*42 = 15*x
420= 15x
To isolate x divide 15 to both sides
420/15 = 15x/15
28 = x
Hope this helped!
~Just a girl in love with Shawn Mendes