I need help finding the a, b,c for this question

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

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

You buy five cds at a sale for $5.95 each. write an expression for the total cost of the cds. then use the distributive property and mental math to evaluate the expression.