Louise’s answer is not correct. She is missing the term 30x3. When squaring a binomial, it is best to write the product of the binomial times itself. Then you can use the distributive property to multiply each term in the first binomial by each term in the second binomial. Louise also could have used the formula for a perfect square trinomial, which is found by squaring a binomial.
Start with
Add 2x to both sides:
Subtract 21 from both sides:
Divide both sides by 5. Since it is positive, we don't have to change the inequality sign:
So, the answer is 
-2x + xy = 30.....when y = 8
-2x + 8x = 30
6x = 30
x = 30/6
x = 5 <==
Ahh... this is pretty easy!!
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Locomotive is 40 feet.
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Model is 16.
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So?
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Divide 40 by 16!!
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What's that?
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2.5.
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So your answer choice is 2.5
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Hope I helped!!
Line p and q are not parallel, because the two given alternate interior angles are not congruent. (It’s B)
