Which expression could be used to solve this problem? bart practices piano every day. first he practices songs for 20 minutes. then he practices scales for 15 minutes. how much time does bart practice piano in 3 days? a. 3 × (20 – 15) b. 20 × (15 + 3) c. 3 × (20 + 15) d. 20 × (15 – 3)

Nash is making a framed enlargement of a mary cassatt postage stamp to present to a retired postmaster. he enlarges the stamp using a scale of 2 inches to 1 centimeter. if the actual length of the stamp is 3 centimeters and its width is 5 centimeters, what are the dimensions of the scale picture? a. the length is 6 inches, and the width is 10 inches. b. the length is 1.5 inches, and the width is 2.5 inches. c. the length is 5 inches, and the width is 10 inches. d. the length is 5 inches, and the width is 7 inches.