Which calculations performed on the calculator are reasonable, using estimation? check all that apply.

2.8 × 210 = 588
50 di 2/5=5
89 × 0.18 = 160.2
1/5 di 1/5= 0.04
3/4 x 5 = 3,75

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

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.

Determine if the equation defines y as a function of x: 2xy = 1. yes o no