Please help me on question 1 :)

How to use order of operation in 20 divide by 4 multiply 5 = 1

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.

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom