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ppdgboy

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This doesn't seem right
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- According to my knowledge when you multiply a square root times a square root, it will just be the number. So shouldn't it be 10i and not 10i²?
Why is this the answer?
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Why is it C?
Can someone help me with this question?
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A question on simultaneous equations gives the two equations 3x+2y = 17 and 5x-4y=21. The question asks you to solve for y. I used the substitution method. So I can save time, I solve for y directl...