## Answer :

[tex]1h=\$4.5[/tex]

then we have to divide [tex]31.5[/tex] by [tex]4.5[/tex]

[tex]31.5/4.5=\frac{31.5}{4.5}=7[/tex]

it means Donovan babysit children of this family for 7 hours

**Answer:**

Donovan babysat for 7 hours.

**Step-by-step explanation**

Numerator = Money Earned Denominator= Hours Worked

[tex]\frac{9}{2}[/tex] = [tex]\frac{31.50}{x}[/tex] 31.50 x 2= 63 63/9 = **7**