Please help me I'm so bad at math and doing AFDA really doesn't help.. Order the steps for this equation I guess pls help

Which math sentence can be used to determine if the triangle is a right triangle?

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

50 points~ ! i have to turn this in tomarrow