Which set is a function? a) {(0,3), (3,0), (0,4), (4,0)} b) {(0,2), (2,0), (4,6), (6,4)} c) {(2,6), (3,6), (4,6), (2,0)} d) {(6,2), (2,0), (4,6), (6,4)}

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c

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)) =

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x