Place the indicated product in the proper location on the grid. (wx - y)2

i can't attach the grid so heres the spaces and the given things lol : )

- - x - - - w x - - - - - - -

Find the length of cu, the triangles are similar.

Pranza plotted point a in the coordinate plane below.

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax