Nathan and Steven stacked boxes on a shelf. Nathan lifted 13 boxes and Steven lifted 15 boxes. The boxes that Nathan lifted each weighed 12 lb more than the boxes Steven lifted. Let s represent the weight of the boxes that Steven lifted. Which expression represents the total number of pounds Nathan lifted?

A. 12 (s+13)

B. 13 (s+12)

C. s + 12

D. 15 (s+12)

13 (s+12) pounds

B is correct.

Step-by-step explanation:

Nathan and Steven stacked boxes on a shelf.

Nathan lifted 13 boxes Steven lifted 15 boxes.

Let s represent the weight of the boxes that Steven lifted.

The boxes that Nathan lifted each weighed 12 lb more than the boxes Steven lifted.

Weight of each box lifted by Nathan = (s+12) lb

Total number of box lifted by Nathan = 13

Total weight of boxes = Total number of box * Weight of each box

= 13 * (s+12)

Expression: 13 (s+12) lb

Hence, The total weight of boxes lifted by Nathan will be 13 (s+12) pounds