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3 years ago

15

Help fast please. :)

1 answer:

tatiyna3 years ago

6 0

Answer:

12cm²

Step-by-step explanation:

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1 + 5sin^2x= 7sin^2x solve trig equation. Can you show me how to solve this trig equation?

pantera1 [17]

Answer: $x = \frac{\pi}{4}\pm k\frac{\pi}{2}\,\,\,\,\,\,k=\{0,1,2,...\}$

Step by step:

$1 + 5\sin^2x= 7\sin^2x\\\sin^2 x\rightarrow z\\1 + 5z = 7z\\2z = 1\\z = \frac{1}{2}\implies \sin^2 x = \frac{1}{2}\\|\sin x| = \frac{1}{\sqrt{2}}\\\sin x = \pm\frac{1}{\sqrt{2}}=\pm\frac{\sqrt{2}}{2}\\\implies x = \frac{\pi}{4}\pm k\frac{\pi}{2}\,\,\,\,\,\,k=\{0,1,2,...\}$

(Used a table of common angles)

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4 years ago

Which number is the largest A. 0.37 B. 0.037 C. 0.004

DENIUS [597]

The correct answer is A

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3 years ago

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Some algae contains up to 50% oil by weight. How much oil is in a 7.3-ounce sample of this type of algae?

frutty [35]

Answer: 3.65

Step-by-step explanation:

This question is asking basically what is 50% or 1/2 of 7.3.

Let's expand the number 7.3

Then, we end up getting 7.30.

We have to find 1/2 of 7.30.

$\frac{1}{2}$ of 7.30 = $3.65$

Hope this helps you!

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3 years ago

If your cell phone bill was $67.85 and there is a 7.5% late fee how much will your bill be?

dedylja [7]

$67.85 \times .075 = 5.08875 \\ 67.85 + 5.08875 = 72.94$
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4 years ago

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Which of the following expressions is equivalent to -5.4 - (2.1 + 1.8)?

Leno4ka [110]

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So I would say A. Thanks for asking your question today and have a good day on Brainly.com! :)

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4 years ago