At the end of each day, helen throws all the change from her purse into a box. the box contains only pennies, nickels, and dimes. at the end of one week she found that the total value of the coins was $6.43. if the number of dimes was 3 more than the number of nickels and the number of pennies was 5 more than the number of nickels, how many dimes were in the box?

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?