Line slope of 2/3 and y intercept of -3

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4

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