For these two rates, calculate the unit rate and determine if these two rates are proportional

What is the common difference in the following arithmetic sequence 7,3,-1,-5

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

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.