Ella has 50 stacks of ten pennies in each stack. describe how to find how many pennies ella has in all.

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17

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?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9