Determine if the situation described in each row can be represented by 9x+3=21 or by 3x+9=21. Select the correct answer in each row. Situation 9x+3=21 3x+9=21 Selina had 21 stickers. She gave the same amount of stickers to each of her 9 friends and had 3 stickers left over. How many stickers did Selina give each friend? Robert went to an art supply store. He got a pack of paintbrushes for $9 and some bottles of paint for $3 each. His total came out to $21, before tax. How many bottles of paint did Robert get? Louise needs to paint 21 ceramic vases. She has already painted 9 vases and can paint 3 vases in one hour. How many hours will it take Louise to paint the remaining ceramic vases? Mario had a 21-inch piece of ribbon. He cut 3 inches off and then cut the remainder of the ribbon into 9 equal pieces. What is the length of each of the nine pieces of ribbon?