Question 44016
First, write the equation of variation:
{{{A = kG}}} Where A is the weekly allowance, G is the student's grade level, and k is the constant of variation.
You will need to find the value of k.  You can do this by substituting the given values of A and G into the above equation and solving for k.

{{{9.96 = k(9)}}} Divide both sides by 9.
{{{k = 1.107}}}

Now the equation of variation for your probem is:
{{{A = 1.107G}}}

To find the average allowance of a 4th grade student, just substitute 4 for G in the preceeding equation and solve for A.

{{{A = 1.107(4)}}}
{{{A = 4.428}}} or $4.43