Plz !
there is a certain infinite geometric series whose first term and common ratio are both real numbers, each of whose terms is the cube of the first series’ terms, is 1. obtain the common ratio of the first series.

Ineed with number 6 , explain how to get 1978

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)) =

Which number line correctly shows 0.8 + 0.3?