exam Maths Puzzle Numerical Ability

The demand equation for a certain product is p=x(30-0.0005x) where p is the price per unit and x is the number of units sold. The total revenue for selling x units is given by
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exam Other Question

the problem is on my practice test it is (61/2)divided by (6-4 1/4) Well here it goes,
write an equation for the parabola that is obtained by shifting the graph of y=one fifth x squared exactly 4 units to the right.

thank you.