Need on answering numbers 12,13,14

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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