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4 years ago

Which of the following is the conjugate of a complex number with 2 as the real part and −8i as the imaginary part?

Mathematics

2 answers:

Sergio [31]4 years ago

6 0

Hello,

$\overline{2-8i}=2+8i$
Answer B

sleet_krkn [62]4 years ago

4 0

Hi,

The complex number is

z = a+bi

For a = 2 and b = -8

z = 2+(-8)i
z = 2-8i

The conjugate is

z = a-bi

For a = 2 and b = -8

z = 2-(-8)i
z = 2+8i

Answer:

B. 2+8i

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Which expression is a difference of cubes?

Tanzania [10]

Answer:

Option 4 is correct.

Step-by-step explanation:

Given the following options

we have to choose the difference of cubes.

Option 1:

$9w^{33}-y^{12}$

$9(w^{11})^{3}-(y^4)^3$

which is not the difference of cubes

Option 2:

$18p^{15}-q^{21}$

$18(p^5)^3-(q^7)^3$

which is not the difference of cubes

Option 3:

$36a^{22}-b^{16}$

$(6a^{11})^2-(b^8)^2$

which is the difference of square

Option 4:

$64c^{15}-a^{27}$

$(4c^5)^3-(a^9)^3$

which is the difference of cubes.

8 0

3 years ago

Given a sphere with a radius of 3cm, find its volume to the nearest whole number.

Travka [436]

Answer:

V≈113.1cm³ radius = 3 cm

Step-by-step explanation:

5 0

3 years ago

Please I need help on solving for x

Sedaia [141]

Answer:

$34^o=1/2((3x-2)^0-(x+6)^o)$

$68^o=3x^o-2^o-x^o-6^o$

$68^o+8^o=2x^o-8+8^o$

$76^o=2x^o-->x=38^o$

$\huge\boxed{\boxed{\underline{\textsf{\textbf{x=38}}}}}$

<h3><u>---------------------</u></h3><h3><u>hope it helps...</u></h3><h3><u>have a great day!!</u></h3>

5 0

3 years ago

Need the answer ASAP

Evgesh-ka [11]

Anwser:

22.5 or 5/22 or 30

Step-by-step Explanation:

-2 and -2
SSS
-2+-2= -4

-4 x 30= -120

-120 divided by 4 is 30
but that’s not a fraction so you do

22.5 or 5/22

-2 x -2 x 30=

7 0

3 years ago

A. Seven fewer than t

Katyanochek1 [597]

7 fewer than t is:

t - 7

I hope this helps

7 0

4 years ago