For the following three problems (1. – suppose the scores on an exam in a large class are normally distributed with a mean μ = 81 points (out of 100), and standard deviation σ = 5 points. the instructor decides to set the "failing" score at 70, so anyone who scored below a 70 has a failing score. what proportion of exams will have failing scores? show all work, use provided standard normal table (z table), and show the proportion as a decimal rounded to four decimal places.

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

Someone answer asap for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0