A small stone is thrown vertically upwards from a point A above the ground. At time t secs after being thrown from A, the height of the stone above the

ground is s metres. Until the stone hits the ground, s = 1.4 +19.6t- 4.9t²

(a) Write down the height of A above the ground.

(b) Find the speed with which the stone was thrown from A.

(c) Find the acceleration of the stone until it hits the ground

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)) =