Plzzz me! i need a good grade! 10 or 20 points!

question 1: which equations, tables, or graphs represent functions? select the three answers that apply.
(use picture for one of the options)

1: which one represents a function? use picture!

2: which one represents a function? y=3x+17 or 20=2x+12

3: which one represents a function? x coordinates are: 16,8,0,-8 y coordinates are: 12,-4,12,28 or x coordinates are: 12,-4,12,28 y coordinates are: 16,8,0,-8?

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

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)) =

The measure of an angle is 117°. what is the measure of a supplementary angle?