A pharmacist has 13% alcohol solution and another 18% alcohol solution. How much of each must he use to make 50 grams of a 14% alcohol solution? please help me with this, I would really apreciate it and I will give brainiest to the correct answer

What is the volume of the sphere shown below with a radius of 3?

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?