Answer:
'For 8.5 hours of babysitting, Tiva will earn $68'.
'If Tiva babysits for 4 hours, she will earn $32'.
Explanation:
We have that,
'Tiva earns $48 for 6 hours'.
1. Since, for 6 hours, she earns $48.
Then, for 8.5 hours, she will earn

i.e. She will earn =

i.e. She will earn =

i.e. She will earn = $68.
So, we have 'For 8.5 hours of babysitting, Tiva will earn $68'.
2. As, for $48, she babysits for 6 hours.
Thus, for $32, she will babysit for

i.e. She will babysit for

i.e. She will babysit for

i.e. She will babysit for 4 hours.
So, we get, 'If Tiva babysits for 4 hours, she will earn $32'.