Answer:
C) 12
Step-by-step explanation:
First, look for the values of both x and y.
Since the triangles are equal to each other, you can set these equations up:
10=4x-2
21=2y+3
You would then just for x and y using those equations, so:
10=4x-2
12=4x
x=3
21=2y+3
18=2y
y=9
Finally, since the expression for QR is x+y, you'd simply add the values together.
x+y = 3+9 = 12
