Which of the following best describes the focus of a parabola? O A. A single line that is the same distance from the parabola as the
directrix is from the parabola
B. A single line that is half the distance from the parabola as the
directrix is from the parabola
C. A single fixed point that is the same distance from the parabola as
the directrix is from the parabola
D. A single fixed point that is half the distance from the parabola as
the directrix is from the parabola

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)) =

Me d is also an option but i couldn't get it in the picture

You have 37 coins that are nickels, dimes, and pennies. the total value of the coins is $1.55. there are twice as many pennies as dimes. find the number of each type of coin in the bank.