For each situation, write the equation to represent each situation. then use your equation to answer each question. be sure to define your variables, identifying which is independent and which is dependent. show all work. round any decimals to the nearest hundredth and choose the correct answer from the choices below.

a plumber charges a customer 60 dollars an hour plus the price of any parts needed to complete the work. if the total bill is 240 dollars and just the parts alone cost 90 dollars, how long did it take to complete the work?

a) 2.5 hours

b) 300 minutes

c) 6.17 hours

d) 4 hours

What is the solution of the systems of equations? y=2/3x+3 x=-2

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)) =

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank