Simplify it like i mean how the google did this :(question is 19/8.34

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.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Use the distance formula to find the distance between (-3,5) and (3,1)