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3 years ago

10

Which civilization first started using iron to make weapons?

1 answer:

nignag [31]3 years ago

5 0

The Assyrian army was the first <span>to use iron</span> in its weapons .

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What did Reconstruction accomplish in the short term?

marta [7]

Reconstruction was a success in that it restored the United States as a unified nation: by 1877, all of the former Confederate states had drafted new constitutions, acknowledged the Thirteenth, Fourteenth, and Fifteenth Amendments, and pledged their loyalty to the U.S. government.

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3 years ago

23. Find the exact value of cos(20) knowing that: *

Kaylis [27]

Answer:

$\cos(2\theta) = 0$

Explanation:

Given

$\sin(\theta) = -\frac{\sqrt 2}{2}$

$270^o < \theta < 360^o$

Required

$\cos(2\theta)$

Recall that:

$\sin^2(\theta) + \cos^2(\theta) =1$

Substitute: $\sin(\theta) = -\frac{\sqrt 2}{2}$

$(-\frac{\sqrt 2}{2})^2 + \cos^2(\theta) =1$

$\frac{1}{2} + \cos^2(\theta) =1$

Collect like terms

$\cos^2(\theta) =1-\frac{1}{2}$

$\cos^2(\theta) =\frac{1}{2}$

$\cos(2\theta)$ is calculated as:

$\cos(2\theta) = \cos^2(\theta) - \sin^2(\theta)$

So, we have:

$\cos(2\theta) = \frac{1}{2} - (-\frac{\sqrt 2}{2})^2$

$\cos(2\theta) = \frac{1}{2} - \frac{2}{4}$

$\cos(2\theta) = \frac{1}{2} - \frac{1}{2}$

$\cos(2\theta) = 0$

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3 years ago

Which statements apply to campaign finance and the laws controlling it? Check all that apply. Individual donors can contribute u

rjkz [21]

Answer:

1 Individual donors can contribute up to a set amount and no more.

2 Finance laws require that donors and the amounts given be identified.

4 Campaigns are financed by public and private donations.

Explanation:

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Answer:

Wheres the following?

Explanation:

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4 years ago

The Cleveland Massacre was

tino4ka555 [31]

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