The compressions and rarefraction that make up a sound wave traveling through the air are 1. differences in air pressure.
2. differences in pitch.
3. echoes.
4. an example of infrasound.

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)) =

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b