C. 2
Step-by-step explanation:
(-8(17-12)/(-2(8-(-2) = 2
step-by-step explanation:
given perimeter: 28cm
length: 9cm
atp,
2(l+w)=p of the reactangle
2(9+x)=28
18+2x=28
2x=28-18
x=10/2
x=5
therefore width is 5 cm