Look at the image to answer.

Yes

Step-by-step explanation:

Given that the area of the square floor is 400, we can find the side length because A = x^2 = 400. So, the side length is just the square root of 400 = 20.

Now, we are increasing the length of each side by 21 so that now the dimensions are 21 ft by 21 ft. We multiply these to get the area: 21 * 21 = 441.

Rational numbers are those that can be written in the form p/q, where q ≠ 0. Here, we can write 441 as 441/1, so yes, the new area is a rational number.

Hope this helps!

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.