How do find the measure of similar triangle

The area of a rectangle is 54x^9y^8 square yards.if the length of the rectangle is 6x^3y^4 yards,which expression represents the width of the rectangle in yards

Segment ab is shown on the graph. which shows how to find the x-coordinate of the point that will divide ab into a 2: 3 ratio using the formula

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25