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2 years ago

14

4a²-8ab+4b=????????????

1 answer:

GuDViN [60]2 years ago

3 0

Step-by-step explanation:

4a² - 8ab + 4b²

= (2a)² - 2 * 2a * 2b + (2b) ²

= (2a - 2b) ²

Hope it helps :)

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A circular sector has a central angle of π6 radians and a radius of 9 ft.

ohaa [14]

Answer:

$\approx \: 21.2 \: {ft}^{2}$

Step-by-step explanation:

$central \: \angle = \frac{\pi ^{c} }{6} = 30 \degree \\ \\ area \: of \: the \: sector = \frac{30 \degree}{360 \degree} \times \pi {(9)}^{2} \\ \\ = \frac{1}{12} \times 3.14 \times 81 \\ \\ = \frac{1}{12} \times 254.34 \\ \\ = 21.195 \: {ft}^{2} \\ \\ \approx \: 21.2 \: {ft}^{2}$

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3 years ago

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Factor over the complex numbers, if possible: x² + 2xyi - y2<br><br> What is the answer?

yanalaym [24]

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Answer:

(x +yi)²

Step-by-step explanation:

Comparing the given expression to the square of a binomial, we can determine the given expression to be a square.

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Here, we have a=x and b=yi. Then the factorization is ...

x² +2xyi +(yi)² = (x +yi)²

8 0

2 years ago

What is the volume of the pyramid?<br> 8 cm<br> 10cm<br> 80m<br> 120 cm<br> 240 cm

blsea [12.9K]

Answer:

Volume = 80 cm3

Step-by-step explanation:

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3 years ago

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What is the solution to the system of equations l? y= 1/2x-6 x=-4

alina1380 [7]

Answer:

<h2>x = -4 and y = -8 → (-4, -8)</h2>

Step-by-step explanation:

$y=\dfrac{1}{2}x-6\\\\x=-4\\\\\text{Put the value of x to the first equation:}\\\\y=\dfrac{1}{2}(-4)-6\\\\y=-2-6\\\\y=-8$

4 0

2 years ago

Help this is urgent!!!

galina1969 [7]

c = pi times d so that would mean d divided by pi would be the diameter.

to find the radius you would then have to take the diameter and times it by 1/2 bc r = 1/2 times d

i hope this helps

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2 years ago