3 years ago

If x - 2y + z = 5 and -x + 3y - z = 2, then y = ?

Mathematics

1 answer:

jok3333 [9.3K]3 years ago

5 0

Answer:

y=10

Step-by-step explanation:

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gregori [183]

$i^5+i^{-25}+i^{45}$

Rewrite the term $i^{-25}$

$=i^5+\dfrac{1}{i^{25}}+i^{45}$

Expand each term so we have

$=i(i^2)^2+\dfrac{1}{i(i^2)^{12}}+i(i^2)^{22}$

Use the fact that $i^2=-1$

$=i(-1)^2+\dfrac{1}{i(-1)^{12}}+i(-1)^{22}$

Use the fact that $(-1)^{a}=1$ when a is an even number

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Step-by-step explanation:

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