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vovikov84 [41]
3 years ago
15

I really extremely need help! I will give you 5 stars and branilest

Mathematics
1 answer:
igomit [66]3 years ago
4 0

Answer:

3.6 pounds

Step-by-step explanation:

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2 (x + 4) = 4.2 (x - 2) - 2x
dalvyx [7]

Answer:

X=82

Step-by-step explanation:

6 0
3 years ago
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4x what = 2800?! need help asap!
inn [45]
4 times 700 would equal 2800. that is the answer to your question.
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3 years ago
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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

  1. 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.

4 0
3 years ago
Find the value of x.
Over [174]

Answer:

no need to divide by 2.

Step-by-step explanation:

let's see u will understand.

solution,

x+67=180 (being straight line)

or, x=180-67

x=113 answer.

hope it'll help you.

7 0
3 years ago
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PLEASE HELP ME! I WILL GIVE BRAINLIEST
RSB [31]

Answer:

  • 30 cm²

Step-by-step explanation:

The shaded area is the difference of the total area and the white triangle.

The white triangle has base of 9 cm and height of 4 cm.

<u>Its area is:</u>

  • A = 1/2*9*4 = 18 cm²

<u>Area of rectangle:</u>

  • A = 12*4 = 48 cm²

<u>The shaded area:</u>

  • 48 - 18 = 30 cm²
3 0
2 years ago
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