Line perpendicular to y= 2/3x +6 that goes through (-6,4) can you explain it too? I have a bunch of questions like this that I don't understand:/

It takes a total of 6 hours to fill up an inground backyard pool using a standard house. a function can represent this situation to represent the amount of water in the pool until it is full a function of time the hose is running. determine the domain for the function

How do i do this activity, is appreciated

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