9and 5 twelves, minus 6 and 7 twelves

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

Consider an example of a deck of 52 cards: example set of 52 playing cards: 13 of each suit clubs, diamonds, hearts, and spades ace 2 3 4 5 6 7 8 9 10 jack queen king clubs diamonds hearts spades what is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.

Every night nathan has to read for at least 25 minutes write and inequality that shows how long nathan can read each night