Question

I need help with numbers 8-11. By the way whoever answers the quetion, the next quetions I'll put 40 points cause this one I put 20. And I need this one by tomorrow.

Answer 1

for number 8,Section A:
country carpets:22 × square +100
city carpets:25 × square +70
⇒22x +100= 25x+70
⇒X=10