5620/16=351.25
Meaning you'd need 352 16-ounce bottles to hold 5620 ounces of water.
Square root of 89 = 9.43398113 rounded to the nearest hundredth is 9.43 :)
Part a: the first cereal is y=7x and the second one is y=10x so they are $3 apart.
part b: y=7*4 (28) and y=10*4 (40) is $12 apart so she will save $12 each month.