Help fast don’t understand

Which of the following is correct interpretation of the expression -4+13

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.