Answer:
79
Step-by-step explanation:
QR=TS
9a+43=a+75
-43 from each side
9a= a+32
8a=32
a=4
QR=9a+43=79
In Parallelogram, opposite sides are equal.
So,
QR = ST
QR = 9a + 43
ST = a + 75
Since, QR = ST
9a + 43 = a + 75
9a - a = 75 - 43
8a = 32
a = 32 / 8
a = 4
= 9 ( 4 ) + 43
= 36 + 43
QR = 79
