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AnnZ [28]
3 years ago
15

69+69 please help to hard​

Mathematics
2 answers:
Dafna11 [192]3 years ago
8 0

Answer:

138

Step-by-step explanation:

Add

serg [7]3 years ago
6 0
69 + 69 = 138

… hope this helped. could also equal 420.
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Answer:

\left\{\begin{array}{l}x=t\\ \\y=0\\ \\z=8\end{array}\right.

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Step-by-step explanation:

yz-plane has the equation x=a, where a is a real constant. The normal vector of this plane (vector perpendicular to the plane) is

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\left\{\begin{array}{l}\dfrac{x-0}{1}=t\\ \\\dfrac{y-0}{0}=t\\ \\\dfrac{z-8}{0}=t\end{array}\right.\Rightarrow \left\{\begin{array}{l}x=t\\ \\y=0\\ \\z=8\end{array}\right.

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