Craig can paint his house in 20 hours. His friend David can paint the house in 48 hours. If David helps Craig paint his house, how long will it take them to do the job together?* *State your answer as a decimal. Round to the nearest thousandth.​

What is the scale factor of two similar pyramids with volumes of 64 cubic feet and 8 cubic feet

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i

Mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.