8/m=6/15 use cross multiplying

1 answer:

Tema [17]3 years ago

7 0

Answer: m=20

Step-by-step explanation:

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Korolek [52]

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Alik [6]

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AlekseyPX

$~~(6+9i)(6-9i)\\\\=6^2-(9i)^2~~~~~~~~~~~~~~~~~~~;[a^2-b^2 =(a+b)(a-b)]\\\\=36-81i^2\\\\=36-81(-1)~~~~~~~~~~~~~~~~;[i^2 = -1]\\\\=36+81\\\\=117$

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