What is the value of x in qrst? a. 16 b. 12 c. 8 d. 4

the answer is the option D

Step-by-step explanation:

see the attached figure to better understand the problem

we know that

The figure is a parallelogram

In a parallelogram,the diagonals bisect each other

so

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Looking through the solution he made. The second step seem to be erroneous. Clarence did not subtract 15 on the right side. It should be done as follows:

3x + 15 = 33
3x + 15 - 15 = 33 - 15
3x = 18
x = 6

Therefore, from the choices the correct answer is the second option, x should be 6.