Which of the following sets of ordered pairs represents a function? A.
{(9,14), (9,4), (0,0), (11,16)}
B.
{(0,-9), (14,-9), (0,9), (-9,14)}
C.
{(9,-9), (12,-9), (0,-9), (-9,12)}
D.
{(-9,9), (-9,12), (-9,0), (12,-9)}

In a school 2/3 of the students study a language of those who study a language 2/5 study french

One integer is 8 times another. if the product is 72, then find the integers

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)) =