IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Out of a randomly selected 1200 people from the population, how many
of them
would have an IQ between 71 and 118, to the nearest whole number?

Solve for x by completing the square. 2x^2-4x+7=0

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)) =

Is the number 128.439 a rational number