1) 18q-6r q=-5/6 r=17/18

18*(-5/6)-6*(17/18)=-15-17/3=-62/3=-20*2/3

2)8-0.2t and 8+0.2t  t=4

8-0.2*4=7.2    8+0.2*4=8.8

7.2 > 8.8

3) 8b-6u-6b+5u=2b-1u       8(11p-9)-10=88p-72-10=88p-82

7s-(s+8)+(11s-6)=7s-s-8+11s-6=17s-14

4) -6(1.8s-5.5)-17.2s-6  s=-1/5

-10.8s+33-17.2s-6=-28s+27=5.6+27=32.6

5)-

6)9g-(7g-(2g-n))=9g-(7g-2g+n)=9g-5g-n=4g-n