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Leni [432]
3 years ago
6

Can someone help me with this?

Mathematics
1 answer:
kaheart [24]3 years ago
3 0

Answer:

D. 63 degrees

Step-by-step explanation:

For the first answer

Cos B = 0.45  

tan60 = √3

= 60° = arctan √3

Cos B = 0.45

B = 63°

Thus B = arc cos 0.45 = 63°

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For which rational expressions is 8 an excluded value? Check all that apply.
sukhopar [10]

Answer:

im pretty sure its c and d

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I will give brainliest!!! Zack needs to melt a stick of butter that measures 5 inches by 1 inch by 1 inch. He is going to put th
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The surface area will be larger which would allow for the heat to penetrate more of the butter faster.

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Solve the equation 2x^2+8x-1=o by completing the square. Give your answer to 2 decimal places
Anna007 [38]

Answer:

x ≈ - 4.12 , x ≈ 0.12

Step-by-step explanation:

Given

2x² + 8x - 1 = 0 ( add 1 to both sides )

2x² + 8x = 1 ← factor out 2 on the left side

2(x² + 4x) = 1

To complete the square

add/ subtract (half the coefficient of the x- term )² to x² + 4x

2(x² + 2(2)x + 4 - 4) = 1, that is

2(x + 2)² - 8 = 1 ( add 8 to both sides )

2(x + 2)² = 9 ( divide both sides by 2 )

(x + 2)² = \frac{9}{2} ( take the square root of both sides )

x + 2 = ± \sqrt{\frac{9}{2} } = ± \frac{3}{\sqrt{2} } = ± \frac{3\sqrt{2} }{2}  ( subtract 2 from both sides )

x = - 2 ± 1.5\sqrt{2} , thus

x = - 2 - 1.5\sqrt{2} ≈ - 4.12 ( to 2 dec. places )

x = - 2 + 1.5\sqrt{2} ≈ 0.12 ( to 2 dec. places )

5 0
4 years ago
Zher and Gabbie are making cookies for the Hospitable Pantry. They only have up to 6 hours to
GrogVix [38]

Answer:

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4 0
3 years ago
Can anyone help me plzzz??!
Roman55 [17]

Answer:

X=1

Step-by-step explanation:

It’s 2 secant lines on a circle.

https://www.mathplanet.com/education/geometry/circles/advanced-information-about-circles

Look at that website. The part says that (ab*ad)=(ac*ae)

Doing that, we get

9*(9+11x)=10(10+8x)

81+99x=100+80x

19x=19

X=1

4 0
3 years ago
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