Suppose a normally distributed random variable x has a mean of 100 and P(x < 90) = 0.40. What is the probability that x is between 90 and 110? Ie. What is P(90 < x < 110)?

What is the binomial expansion of (2x-3)^5

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?

Factor the polynomial, if possible. if the polynomial cannot be factored, write prime. 9n^3 + 27n^2 – 25n – 75