How is the method of volume estimate carried out the volume of a irregular shape solid can be measured indirectly by water displacement?

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Which of the following statement about pascal's triangle are true?

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.