Answer: 31.1 meters
Explanation:
First multiply the number of pieces of slate that he uses by how long they are, so: 22 x 1.3 = 28.6. Then, add the remaining one long piece of slate that he uses, so: 28.6 + 2.5 =31.1. Don't forget to answer using the measurement they gave you. So, answer is 31.3 meters