Can someone pls help i know this seems easy but its not for a none smart person like me

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i