We see that we are given the value of one of the angles, which is QSR. We see another angle, which is QSP, and you should notice that these angles are supplementary, which means that the angles add up to 180 degrees. Therefore we can find the value of QSP by subtracting 112 from 180.
QSP = 180 - 112
QSP = 68 degrees
:)
