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3 years ago

Will someone plz help with these?? 18 and 19

Mathematics

2 answers:

Pavel [41]3 years ago

8 0

Answer:

19 )

do cross multiply

and answer will come

Step-by-step explanation:

w+ý=z/y

Nesterboy [21]3 years ago

8 0

Answer:

18)

y=5/2x-23/2

19)

Both equasions equal

x=z/w+y

Step-by-step explanation:

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slope
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2 years ago

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Step-by-step explanation:

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2 years ago

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2 years ago

Read 2 more answers

How to find the perimeter of shapes

Morgarella [4.7K]

You add the legnths of the sides together exg
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2 years ago

If 2^n + 1 is an odd prime for some integer n, prove that n is a power of 2. (H

vovikov84 [41]

Step-by-step explanation:

We will prove by contradiction. Assume that $2^n + 1$ is an odd prime but n is not a power of 2. Then, there exists an odd prime number p such that $p\mid n$ . Then, for some integer $k\geq 1$ ,

$n=p\times k.$

Therefore

$2^n + 1=2^{p\times k} + 1=(2^{k})^p + 1^p.$

Here we will use the formula for the sum of odd powers, which states that, for $a,b\in \mathbb{R}$ and an odd positive number $n$ ,

$a^n+b^n=(a+b)(a^{n-1}-a^{n-2}b+a^{n-3}b^2-...+b^{n-1})$

Applying this formula in 1) we obtain that

$2^n + 1=2^{p\times k} + 1=(2^{k})^p + 1^p=(2^k+1)(2^{k(p-1)}-2^{k(p-2)}+...-2^{k}+1)$ .

Then, as $2^k+1>1$ we have that $2^n+1$ is not a prime number, which is a contradiction.

In conclusion, if $2^n+1$ is an odd prime, then n must be a power of 2.

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2 years ago