To complete the square, how do you find the value that must be added to the expression to make a perfect square trinomial? what is the value? x^2 + 2/5x + ? a) square 2/5 and add to both sides; 4/25 b) take half of 2/5 and add to both sides; 1/5 c) square half of 2/5 and add to both sides; 1/25 d) take half of 2/5 and add the opposite to both sides; −1/5

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

The rumpart family is building a new room onto their house. the width of the new room will be 16 feet. the length of the room will be 4% greater than the width. write an expression to find the length of the new room. what will be the area of this new room?

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)) =