Simplify 5 - ( x - 3) + 4x
Simplify -3(x + 3) - 2(x + 4)
i'm not sure how to do these questions. I already know the answer. (its all in the back of the book) I'm just not understanding HOW to do it and how to also apply it to other problems that are similar to these. The book explains very little and then adds in different things and i'm just confused. Please please please give a step by step. thank you

Given the function f(x) = log base 4(x+8) , find the value of f^-1(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)) =

Find the distance between (7,-6) and (-3,-9)