Can I have one word math group names u can give as many as u want I will pick one and if I like it I will mark u as a brainliest

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)) =

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)