A) Isi petak kosong pada garis nombor di ruang jawapan dengan nilai yang betul. b) Selesaikan/Solve: 3 4/7 x (8/9 - 2/3)

The known values are $-0.8$ and 1.0.
The difference is $1.0 - (-0.8) = 1.0 + 0.8 = 1.8$.
There are 3 intervals between $-0.8$ and 1.0.
The length of each interval is $\frac{1.8}{3} = 0.6$.

The box to the right of $-0.8$ is $-0.8 + 0.6 = -0.2$.
The box to the left of $-0.8$ is $-0.8 - 0.6 = -1.4$.
The box to the left of $-1.4$ is $-1.4 - 0.6 = -2.0$.

The completed number line values are: $\boxed{-2.0}$, $\boxed{-1.4}$, $-0.8$, $\boxed{-0.2}$, 0.4, 1.0.

The solution is $\boxed{\frac{50}{63}}$.