1. in your own words you can say like if you multiply the left and right number it gives you the top number
2. if you add the left and right numbers you get the bottom number
Using perfect squares simplification, it is found that the value of the desired limit is of -4.
<h3>When is a limit?</h3>
It is the value of a function as x approach
In this problem, the limit we want to find is given by:

If we just replace x by -2, we end with an undetermined limit, as we have 0/0.
However, the perfect square simplification states that:
a² - b² = (a - b)(a + b).
Hence:
x² - 4 = (x + 2)(x - 2).
Then:

Hence, the value of the desired limit is of -4.
More can be learned about limits at brainly.com/question/26270080
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For number 6 its A. 4
For number 7 its B. -2/5
There are 4! = 24 poosible permutations of the four letters. Let the letters be A, B, C and D. Two permutations will have only letter A in the correct envelope, two more permutations will have only letter B in the correct envelope, two more will have only letter C in the correct envelope and two more will have only letter D in the correct envelope. Therefore 8 out of the 24 possible permutations will have only one letter with the correct address. The required probability is 8/24 = 1/3.
3/5 is greater than 1/4...