explain

You're right that neither statement (1) nor (2) are sufficient, so I'll jump to what happens when we combine both pieces of information.

From (1) we can conclude that angleRQS = angleRSQ
From (2) we can conclude that angleTUS = angleTSU

We also know that:
(angleRQS + angleRSQ + angleR) + (angleTUS + angleTSU + angleT) = 360

Here's the big part: angleR + angleT = 90 (since they must add to angleP to get 180 degrees)

So, we can conclude that (angleRQS + angleRSQ) + (angleTUS + angleTSU) = 270

Since angleRQS = angleRSQ and angleTUS = angleTSU, we can say that: angleRSQ + angleTSU = 135

Finally, since angleRSQ + angleTSU + angle X must add to be 180, we can conclude that angle x is 45

So the answer is E