Which of the following points is on the unit circle ?
a: 1,1
b: 1/4, 3/4
c : 1/2,1/2
d: 0,0
e: radical 3/2, 1/2

15 point ! ~ see if you know the answer to both you!

Plz heeeeeeelp plz give me the answer

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)) =