An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 50 hours. How large a sample is need if we wish to be 95% confident that we will be within 12 hours of the true mean?

An art teacher made a copy of a small painting. to make the painting easier to see the teacher enlarged the area of the painting by 49%. let y respresent the area of the original painting. the expression below is one way to resperesnt the area of the new painting.find two equivalent expressions that would give the area of the new painting y+0.49y