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Given:
Babysitting =$11/hours
Tutoring=$17/hours
Total work hours is=12 hours
Minimum many earn=$150
Work 2 houre for babysitting
so money earn is:
[tex]\begin{gathered} \text{earn amount =2}\times11 \\ =22 \end{gathered}[/tex]Earn amount is $ 22
then required amount is:
[tex]\begin{gathered} \text{required amount =150-22} \\ =128 \end{gathered}[/tex]so tutoring time for reuired amount is:
[tex]\begin{gathered} tutoring\text{ time=}\frac{128}{17} \\ =7.52 \end{gathered}[/tex]so 7.52 hours is tutoring time and 2 hours babysitting then it 9.52 hours achieved minimum earn amount
so minimum hours for tutoring is 7.52 hours.