Marcus wants to find the speed of a train that traveled z of a mile in 6 minutes. Sanjay wants to find the speed of a train that traveled 6 miles in 5 of an hour. Whose problem is best modeled by a division expression?
O only Marcus's
o only Sanjay's
O both Marcus's and Sanjay's
O neither Marcus's nor Sanjay's

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)) =

Can someone show me step by step how to do this?

3c2 + 2d)(–5c2 + d) select all of the partial products for the multiplication problem above.