A 10-gallon container is filled halfway with a mixture that is 80% vinegar and 20% water. How many gallons of water must be added for the mixture to become 50% vinegar and 50% water? Answer ASAP please

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.