There are 6 red, 9 blue and 5 green marbles in a bag. Samantha reaches into the bag and chooses one marble. Which color has one fourth of being chosen

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Ibeg you to me 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

(c) a vine called the mile-a-minute weed is known for growing at a very fast rate. it can grow up to 0.5 ft per day. how fast in inches per hour can the mile-a-minute weed grow up to? show your work using the correct conversion factors.