By taking the product of the two fractions we will see that the number that goes in the green box is a 6.
<h3>
How to add two fractions?</h3>
We only can add two fractions if we have the same denominator in both of them, here we want to transform -2/3 in an equivalent fraction, such that the denominator is 9, so we multiply both the numerator and denominator by 3.
So we need to solve:

From that, we can conclude that the number that goes in the green box is 6.
If you want to learn more about fractions, you can read:
brainly.com/question/11562149
Answer:
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Step-by-step explanation:
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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.