Answer:
Step-by-step explanation:
PQS and RQS are supplementary
PQS +68=180
PQS =112
x+ 112+TSQ=180
4x=3x+TSQ
TSQ=x which means
2x+112=180
2x=68
x=34
30 items are sold there
21/0.7 --> 210/7=30
X= 1/2
-3x+7x=2
4x = 2
4x/4 + 2/4
2,-3 do you need me to explain