Answer:
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Step-by-step explanation:
NEED MORE INFO...
Hey! I'll provide you the answers!
First you want to simplify the equation using cross-multiplication.

Finally, you would want to divide both sides by 15.
n = 161
Answer:
you have to divide 12 by 15
Step-by-step explanation:
||a|| is called the norm of a. The answer is square root of 58. Hope it helps