One electrician charges a flat fee of $55 to come to the house, $20 per hour, and the cost of all materials. If h represents the number of hours that
the electrician spent fixing the problem, C represents the total charge, and m
represents the cost of materials, which of the following equations shows how
to determine the total fee charged?

C=20+55h+m

C=mh+55 +20

C=(55+20)h+m

C=55+20h+m

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

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)) =