What are the advantages of switching a quadratic function from standard form into vertex form

Simplify the expression 10/11(22z) + (a+5) -1

It takes jonas 7 1/4 minutes to run the mile. it takes mario 8 5/12 to run the mile. how much faster is jonas than mario? 5/6 minute 1 1/3 minutes 1 1/6 minutes 1 1/2 minutesi will give points and brainlest

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