Which set of ordered pairs is a function? {(-6,-4).(-4,-2), (0,0).(-42).(-6,4)}
{(-2,0).(-42). (0,3).(4.1).(-2,5)}
{(-5,1). (-3, 2), (-13), (14)(3,5)}
[(-15).(-14),(-13)(-12).(-11)}
Done

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)) =