9. Mr. and Mrs. Cole decided to repaint their three-bedroom house. It took Mrs. Cole 4 hours to paint the first bedroom, and it took Mr. Cole 3 hours to paint the second bedroom. If all of the bedrooms are the same size, how long would it take the Coles to paint the last bedroom if they worked together? Round your answer to the nearest minute. (3 marks) 10. Identify all restrictions on the variable x in the context of each scenario. a. Sunglass Hut in Southgate Mall received a shipment of sunglasses for $4500. While unpacking the shipment, a box was dropped and 10 pairs of sunglasses were broken and cannot be sold. Sunglass Hut management sells the remaining sunglasses for $8900, making a profit of $5 per pair on the glasses sold. If x represents the number of sunglasses in the shipment, then an equation that represents this information is 8900 4500 -=5. (1 mark) x-10 X b. This winter Ethan and Ella are responsible for keeping their family's driveway clear of snow. Ethan takes x minutes to shovel the driveway on his own and Ella takes 25 minutes longer. It takes Ethan and Ella 30 minutes to clear the driveway if they work together. An equation that represents this information is -+ x x+25 30 (1 mark)