You start reading a book for your literature class two day before your friend. You both read 10 pages per night. A system of linear equations that represents this situation is y=10x20 and y=10x. Will your friend finish the book before you?

Need on this one asap im almost done with this subject

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)) =

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.