Person 1 can do a certain job in twenty-one minutes, and person 2 can do the same job in twenty-eight minutes. when completing the job together, which expression would be used to represent the amount of work done by person 1?

What is the solution of the systems of equations? y=2/3x+3 x=-2

Someone answer asap 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)) =

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?