is 1/4 terminating or repeating or non terminating and non repeating decimal?

1/4 is a terminating decimal.

is -0.030303... rational

Yes, -0.030303... is a rational number. It is a repeating decimal that can be expressed as -3/99.

is 8 a rational teminating decimal?

Yes, 8 is a rational terminating decimal. It can be expressed as 8/1, which is a fraction without a repeating or non-terminating decimal representation.