Auto pistons at Wemming Chung's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of 10 pistons produced each day, the mean and the range of this diameter have been as follows:                                                                 Day Mean Bold x overbar (mm) Range R (mm) 1 154.9 4.2 2 155.2 4.8 3 153.6 4.1 4 153.5 5.2 5 158.6 4.3 a) What is the value of x double overbar?

Someone answer this asap rn 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)) =

Ineed me i stuck and i don’t want to get it wrong

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?