The number of hours needed to paint a house varies inversely with the number of painters working. a 2400 square foot house can be painted in 27 hours by 6 painters. how many painters would it take to paint the house in 18 hours? i know the formula is y=k/x but i know y is the hours, but don't know what k and x should be. and show you work. merci beaucoup!

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. solve this quadratic equation using the quadratic formula. 2x2 - 2x=1 need asap