Which pair of complex numbers has a real-number product?

O (1 + 2i) (8i)

0 (1 + 2i) (2 - 5i)

O (1 + 2i) (1 – 2i)

O (1 + 2i)(4i)

Answers

Answer 1

Answer:

(1 + 2i)(1 - 2i)

Step-by-step explanation:

Multiplying a complex number and its conjugate results in a real number.

Thus

1 + 2i and 1 - 2i are conjugates

(1 + 2i)(1 - 2i) ← expand using FOIL

= 1 - 2I + 2I - 4I² [ note i² = - 1 ]

= 1 - 4(- 1)

= 1 + 4

= 5 ← a real number

Answer 2

Answer:

C

Step-by-step explanation:

C


Related Questions

Stan borrows $5,500 at a rate of 12% interest per year. What is the amount due at the end of 5 years if the interest is compounded continuously? In your final answer, include your calculations.

Answers

Answer:

1.) Without compound interest, you would earn only $8800.00. This means that thanks to the power of compound interest you will earn an additional $1191.83 in interest at the end of the 5 year term.

2.) Using the compounded interest formula, you will earn $22883.01 after the 7 year term.

3.) Because of the negative interest, the compounded amount is only $695,929.30.

4.) Putting money in a saving account is saving money with a lower earning compared to investments. Investments have the higher potential of earning more than just having a basic savings account.

Step-by-step explanation:

If you don't have compound interest, you would earn only $8800.00. This means that thanks to the power of compound interest you will earn an additional $1191.83 in interest at the end of the 5 year plan.

7/9 divided by 3/4 WITH A MODEL;)

Answers

That doesn't work.... they won't work.

1+8k=-6+8k how many solutions? marking brainlyest

Answers

Answer:

there is no solutions

Step-by-step explanation:

Answer:

The equation has no solution

Step-by-step explanation:

1 does not equal -6

solve for the indicated information. solve for x.

Answers

Answer:

-9

Step-by-step explanation:

x + 109 + x + 89 = 180° because these angles are supplementary

2x + 198 = 180 subtract 198 from both sides

2x = - 18 divide by 2

x = -9

A box has 39kg mass? the surfcae are of the box
has 150m. calculate the pressure exterted by the box on the floor

Answers

Answer:

2.548 pascal

Step-by-step explanation:

force=mass×acceleration due to gravity

force=39×9.8

pressure(p)=force/area

p=382.2/150

p=2.548 pa

1,000 decimeters equal 1 what?

Answers

Answer:

It's 1 kilometer

Step-by-step explanation:

Help please I mark brainliest

Answers

Answer:

negative 5w to the power of 3 .over w to the power of 4

simplify 15 and -3 to (-5/1)

make w to 4 to 4 -3w to the power of 8

then power simplification 6 over 8 to 3 and 4.

2) There are 500 calories in 5 servings of Sour
Patch Kids. How many calories per serving?
How many calories are there in 8 servings?

Answers

there are 100 calories per serving and there a 800 calories in 8 servings.

10 = -3 + x

Question 4 options:

x = 13


x = 7


x = -30


x = -7

Answers

Step-by-step explanation:

10= -3+x

10+3=x

x=13 is ur ans

A glass is 1/3 full. Then 40cm3 of orange juice is poured in.
The glass is now 5/7 full. What is the total volume of the glass?

Answers

Answer:

105cm3

Step-by-step explanation:

subtract 5/7- 1/3

8/21=40cm3

21/21=105cm3=total volume

Answer:

5

Step-by-step explanation:

Does anybody know what 4/5 ( + 1) is in standard form?

Answers

Answer:

4/5 + 1 = 5/5

Step-by-step explanation:

This is because the bottom number is the denominator and the top number is the whole number. So, when you add a whole number to a fraction, the whole number goes to the numerator, not the denominator.

2(5x + 3) - 2(2x - 3)

Answers

Factor: 6(x + 2)

Simplify: 6x + 12

Answer:

[tex]\boxed {6x + 12}[/tex]

Step-by-step explanation:

Solve the following expression:

[tex]2(5x + 3) - 2(2x - 3)[/tex]

-Use Distributive Property:

[tex]2(5x + 3) - 2(2x - 3)[/tex]

[tex]10x + 6 - 4x + 6[/tex]

-Combine like terms:

[tex]10x + 6 - 4x + 6[/tex]

[tex]\boxed {6x + 12}[/tex] (final answer)

give the quadrant each set of coordinates lies in

1 , 5
-2 , 4
-3 , 2
4 , -4

Answers

1) Quadrant 1
2) Quadrant 2
3) Quadrant 2
4) Quadrant 4
quadrant 1
quadrant 2
quadrant 2
quadrant 4

HELP PLSS

What is the slope of the line that passes through the points (-2, -5) and (6, 7)?

Answers

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[tex]slope = \frac{7 - ( - 5)}{6 - ( - 2)} \\ [/tex]

[tex]slope = \frac{7 + 5}{6 + 2} \\ [/tex]

[tex]slope = \frac{12}{8} \\ [/tex]

[tex]slope = \frac{4 \times 3}{4 \times 2} \\ [/tex]

[tex]slope = \frac{3}{2} \\ [/tex]

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Answer:

3/2

Step-by-step explanation:

use the slope formula to solve

y2-y1 is 7- (-5) = 12

x2-x1 is 6- (-2) = 8

the formula is y2 -y1 over x2-x1 so

12/8

simplify it to 3/2 (fraction answer)

convert it to decimal if needed: 1.5 (decimal answer)

What is the slope of the line that passes through points (-10, -3) and (5, 3)?​

Answers

Answer:

m = 6/15

Step-by-step explanation:

Answer:

(-0.4,1)

Have a beautiful day, and stay safe.

A mutual fund company offers its customers a variety of funds: a money-market fund, three different bond funds (short, intermediate, and long-term), two stock funds (moderate and high-risk), and a balanced fund. Among customers who own shares in just one fund, the percentages of customers in the different funds are as follows: Money-market 25% High-risk stock 10% Moderate-risk stock 15% Short bond 12% Intermediate bond 7% Long bond 8% Balanced 23% A customer who owns shares in just one fund is randomly selected. a) What is the probability that the selected individual owns shares in the balanced fund? For your answer, please report the answer in decimals. For example, 50% would be submitted as .5.

Answers

Part b and c are missing and they are;

b. What is the probability that the individual owns shares in a bond fund? c. What is the probability that the selected individual does not own shares in a stock fund?

Answer:

A) P(balanced fund) = 0.23

B) P(bond fund) = 0.27

C) P(no stock fund) = 0.75

Step-by-step explanation:

We are given the percentages of customers in the different funds as follows:

Money-market: 25%

High-risk stock: 10%

Moderate-risk stock: 15%

Short bond: 12%

Intermediate bond: 7%

Long bond: 8%

Balanced: 23%

A) From the percentages given, we can see that the balanced fund is 23%.

Thus,this represents the probability as addition of all the given percentages gives 100%

Thus, probability that the selected individual owns shares in the balanced fund is;

P(balanced fund) = 23% = 0.23

B) From the percentages given, bond funds given are;

Short bond: 12%

Intermediate bond: 7%

Long bond: 8%

Thus,

probability that the individual owns shares in a bond fund is;

P(bond fund) = 12% + 7% + 8%

P(bond fund) = 27% = 0.27

C) Probability that the selected individual doesn't own shares in a stock fund is;

P(no stock fund) = 1 - P(stuck fund)

P(stuck fund) = High-risk stock +

Moderate-risk stock = 10% + 15% = 25% = 0.25

Thus;

P(no stock fund) = 1 - 0.25 = 0.75

The mid segment of the triangle is 5x-1. Find the value of x.

Answers

Answer:

The value of x = 6

Step-by-step explanation:

The Midsegment of a triangle theorem states that the midsegment of a triangle is parallel to the third side of the triangle and it’s always equal to the one half or 1/2 of the length of the third side.

Now we can conclude that from the given triangle, the length of midsegment is 5x-1 which is parallel to the side of length 58, and will always equal to 1/2 of the length of the side of length 58.

Mathematically it means:

[tex]5x-1\:=\:\frac{58}{2}[/tex]

solving to find the length of x

[tex]5x-1=29[/tex]

Add 1 to both sides

[tex]5x-1+1=29+1[/tex]

[tex]5x=30[/tex]

Divide both sides by 5

[tex]\frac{5x}{5}=\frac{30}{5}[/tex]

[tex]x=6[/tex]

Therefore, the value of x = 6

what is the volume of a A prism with a base area of 34 m2 and a height of 6 m.

Answers

Answer:

34 * 6 = 204

Thank you and please rate me as brainliest as it will help me to level up

To which subset of the real number system does -24 belong?

Answers

Answer:

The real numbers have the following important subsets: rational numbers, irrational numbers, integers, whole numbers, and natural numbers. To represent a number on the number line graphically, we plot a point or its coordinate where it is approximately located on the number line.

x2 + 8x + 4 = 0
please help

Answers

Answer:

x= -3/4 or x= 0.75

Step-by-step explanation:

Jessica has 120 stamps in a collection she bought 16 more Jessica wants plays the stamps equally and six pages of the book how many stamps will be on each page of the book 20 stamps 25 stance 30 stamps or $.40 Stan's

Answers

Answer:

30 stamps each

Step-by-step explanation:

This is the correct question:

Jessica has 120 stamps in a collection she bought 60 more Jessica wants to place the stamps equally and 6 pages of a book how many stamps will be on each page of the book

Total stamps = 120 + 60

= 180

Jessica wants to place the stamps equally on 6 pages of a book

how many stamps will be on each page of the book?

Each page of the book = Total stamps / number of pages in the book

= 180 / 6

= 30

Each page of the book will have 30 stamps each

please help!!! I don't understand how this works.


Please explain how you worked it out...

Thanks!!​

Answers

Answer:

Step-by-step explanation:

64,000 x 6.2% divided by groups of 1.45 a

How does the graph of f(x) = |x| compare with the graph of g(x) = -2|x|

Answers

Answer:

the graph of g(x) will be vertically stretched by -2 and it will be steeper

Step-by-step explanation:

Peter is planting trees in his yard. He wants the ratio of pine trees to oak trees to be 3 to 2. Peter wants to plant a total of 45 trees. How many pine trees should he plant?

Answers

Answer:

Step-by-step explanation:

Let the ratio of pine tree to oak tree=3x:2x

Where no. Of pine tree =3x

No. Of oak tree=2x

Total no. Of tree = 3x+2x=45

5x=45

X=9

So no. Of pine tree=3x=3x9=27 tree is answer

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answers

Answer:

Step-by-step explanation:

9 is 39

find the slope
help with this please it’s due soon :)

Answers

undefined!! i hope this helps

Find the area of the trapezoid.

Answers

Answer:

c

Step-by-step explanation:

4.7 x 10^-3___ 2^2
=
<
>

Answers

Answer:

<     (less than)

Step-by-step explanation:

4.7*0.001 ___ 4

0.0047___4

0.0047 < 4

cordenadas cartesianas​

Answers

Answer:

what

Step-by-step explanation:

Un sistema de coordenadas cartesianas es un sistema de coordenadas que especifica cada punto de forma única en un plano mediante un conjunto de coordenadas numéricas, que son las distancias con signo al punto desde dos líneas orientadas perpendiculares fijas, medidas en la misma unidad de longitud.

HELP ME OUT PLEASE IM BAD AT MATH

Answers

Answer:

it is -⅕ if youre asking for the slope

Answer:

I don't know what your looking for but the dots are at -3,-1 and 2,-2

Step-by-step explanation:

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