Answer: A.)0 B.)8/9 or 8.9 repeating C.) 1/100 or 0.01
Step-by-step explanation: Hope this helps in your studies!
[tex]\\ \tt\hookrightarrow a/3=-5a[/tex]
[tex]\\ \tt\hookrightarrow -a/3=5a[/tex]
[tex]\\ \tt\hookrightarrow a=-a/15[/tex]
#b
[tex]\\ \tt\hookrightarrow 12-b=12.5b[/tex]
[tex]\\ \tt\hookrightarrow 12.5b+b=12[/tex]
[tex]\\ \tt\hookrightarrow (1+12.5)b=12[/tex]
[tex]\\ \tt\hookrightarrow 13.5b=12[/tex]
[tex]\\ \tt\hookrightarrow b=0.8888[/tex]
#c
[tex]\\ \tt\hookrightarrow -0.1=-10c^2[/tex]
[tex]\\ \tt\hookrightarrow c^2=0.01[/tex]
[tex]\\ \tt\hookrightarrow c=0.1[/tex]