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RSB [31]
3 years ago
9

Which complex number has a distance of √17 from the origin on the complex plane?

Mathematics
2 answers:
Amanda [17]3 years ago
7 0

Answer:

The complex number 4-i has distance  \sqrt{17} from origin.

D is correct

Step-by-step explanation:

We are given the absolute value of complex plane.

If complex number is a+ib then absolute value \sqrt{a^2+b^2}

We have to check the absolute value of each option and check which is equal to \sqrt{17}

Option A:  2+15i

d=\sqrt{2^2+15^2}=\sqrt{4+225}=\sqrt{229}\neq \sqrt{17}

Option B:  17+i

d=\sqrt{17^2+1^2}=\sqrt{289+1}=\sqrt{290}\neq \sqrt{17}

Option C:  20-3i

d=\sqrt{20^2+3^2}=\sqrt{400+9}=\sqrt{409}\neq \sqrt{17}

Option D:  4-i

d=\sqrt{4^2+1^2}=\sqrt{16+1}=\sqrt{17}= \sqrt{17}

Hence, The complex number 4-i has distance  \sqrt{17} from origin.

guapka [62]3 years ago
6 0
Let the complex number be x + iy

Then by the pythagoras therem

17  = x^2 + y^2

D will satisfy this equation

4^2 + (-1)^2  = 17

answer is D  4 - i

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3 years ago
The sum of 4 consecutive integers is 406. find the integers
BabaBlast [244]

Answer and Step-by-step explanation:

When trying to figure this out, we know that the numbers have to be one after the other, like 1, 2, 3, 4, or 55. 56, 57, 58. The last digit in the numbers also have to add to 6.

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100 + 101 + 102 + 103

It adds up to 406, and the integers are consecutive.

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8 0
2 years ago
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Rick charges $50 plus $40 an hour to fix cars. Let x be the number of hours that he works and y be the overall cost that he char
Serjik [45]
Y= 40x+ 50 (i need 20 characters to post this so ignore)
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3 years ago
Robert has 26 coins that are all nickels and dimes. The value of the coins is $1.85. How many of each does he have?
Ira Lisetskai [31]

Answer:

he has 11 dimes and 15 nickels

Step-by-step explanation:

i kept going down reducing the amount of dimes and adding to the amount of nickels and found that 11 dimes is $1.10 and 15 nickels is $0.75

5 0
3 years ago
Find the probability of having 2,3, or 4 successes in five trials of a binomial experiment in which the probability of success i
Georgia [21]

Answer:

65.3%

Step-by-step explanation:

Binomial distribution PMF below (along with a description)

the probabilty of getting 2, 3, or 4 successes in 5 trials is just

p(2)+p(3)+p(4)

p(2)= 5C2*.4²*(1-.4)³ = .3456

p(3)= 5C3*.4³*(1-.4)²= .2304

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