Explain how to multiply the complex #'s (3+2i)(4-i)

Answers

Answer 1
Multiply the numbers like you multiply binomials.
Multiply every term of the first binomial by every term of the second binomial.
Then combine like terms, and remember that i^2 = -1.

(3 + 2i)(4 - i) =

= 12 - 3i + 8i - 2i^2

= 12 + 5i + 2

= 14 + 5i

Related Questions

The front of a tent is an equilateral triangle with the ratio of its base, b, to its height, h, given by b over h equal fraction numerator 2 over denominator square root of 3 end fraction. What equation can be used to find the tent's height?

Answers

The triangle is equilateral, and the length of a side is b.
The height, h, is given by
[tex] \frac{b}{h} = \frac{2}{\sqrt{3}} [/tex]

Multiply each side by h
[tex]b= (\frac{2}{\sqrt{3}})b [/tex]
Multiply each side by √3/2.
[tex] \frac{\sqrt{3} \, b}{2} = h[/tex]

Answer: [tex]h= \frac{\sqrt{3} \, b}{2} [/tex]

Maths question!!! The angles in triangle ABC are given in degrees, prove that AB=AC

Answers

do 12x+20=40x-8 and solve for x
First, find out the value of x to confirm if they are really true. 

We know that all the interior angles of a triangle equal to 180 degrees. 

4x+5x-8+3x+20=180 
12x=180-12 
12x=168
x=168/12 
x=14 

Put in these values of to find if AB=AC. 

(4×14)(3×14+20)=(4×14)(5×14-8) 

Solve for LHS first, 

(4×14)(3×14+20) = 56×62 

=3472 

Solve for RHS next, 

(4×14)(5×14-8) = 56×62

=3472

Since LHS=RHS, AB is also equal to AC. 

Hope I helped :) 

What is the name of the relationship between  ∠1 and ∠4 ? alternate exterior angles corresponding angles adjacent angles alternate interior angles Assessment menu bar

Answers

corresponding angles

Answer:

coresponding angles buddy

Step-by-step explanation:

Factor 16x 4 – 81 completely. First factor each term. 16x 4 = (_____)2 81 = ___ 2 Then use a2 – b2 = (a – b)(a + b) twice. Show your work. 16x 4 – 81 =

Answers

16x^4 - 81

16x^4 = (4x^2)^2
81 = 9^2

16x^4 - 81 =
(4x^2 - 9) (4x^2 + 9) <==

The completely factored form of expression 16x⁴ - 81 is  (4x² - 9)(4x² + 9).

To factor the expression 16x⁴ - 81 completely, let's first factor each term:

16x⁴ can be written as (4x²)² since (4x²)²= 16x⁴.

81 can be written as 9² since 9² = 81.

Now, we can rewrite the expression:

16x⁴ - 81 = (4x²)² - 9²

Using the formula a² - b² = (a - b)(a + b).

we can apply it twice to factor the expression further:

(4x² - 9)(4x² + 9)

Therefore, the completely factored form of 16x⁴ - 81 is (4x² - 9)(4x² + 9).

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Henry drove 195 miles in 3 hours. How many miles per hour was he driving?

Answers

65 mph is the answer your looking for.

666-601=65

boom

it wont let me put it in without these words\


16. 7⁄8 = ?⁄48 A. 42 B. 1 C. 13 D. 6
i cant answer it :(

Answers

7/8=0.875

42/48=0.875

Hope this helps!

The answer is A) 42. If 7/8= x/48 that means you would multiply 8(the bottom number) by 6 to get 48. And if you multiply the bottom by 6, you have to multiply the top by 6. So 7 x 6= 42. 

If two sides of a triangle measure 12 and 7, which cannot be the perimeter of the triangle

Answers

Hello Tovarmackenzie!
We can utilize the Triangle Inequality Theorem, Which states

A + B > C
A + C > B
B + C > A

With that said, we are going look for C.
We know that
12 + 7 > C
So
19 > C
OR
C < 19
So our 3rd leg has to be less than 19.

So if we make C  =18.999 and Sum up all the sides, 12 + 7 + 18.999 = 37.999
this means the max perimeter is 37.999.. so we know  D: 38 cannot be the perimeter.

38 cannot be the perimeter of the triangle.

What is Triangle Inequality Theorem?

The sum of any two sides of a triangle is greater than or equal to the third side.

Given:

Two sides are 12 and 7.

Using Triangle Inequality Theorem, we have

In ΔABC,

AB + BC > CAAC + CB > BAAB + CA > BC

So,

12 + 7 > C

19 > C

C < 19

So, the third side should be less than 19.

Let us take maximum possible values,

C  =18.999

Then, perimeter will be,

12 + 7 + 18.999 = 37.999

Hence, 38 cannot be the perimeter.

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is 8.23 a rational number?

Answers

Yes, 8.23 is a rational number since it is able to be written as a fraction (any rational number is able to be written as a fraction with an integer numerator and denominator); 8 23/100
Yes, it is a rational number because 8.23 can be expressed as a fraction.

EASYYYYYYYYYYYYYYYYYYYYYYYYYYYY

Answers

The correct answer is:  [C]:  " -5 ΙxΙ = 25 " .
______________________________________________
In this answer choice, when you divide each side by "-5" ; 

 you get:  " ΙxΙ = -5 ;

If x = 5, the result is "5" ; NOT "-5" .

If x = -5, the result is "5" ; NOT "-5" .

The "absolute value" of a value is always "zero" or greater.
______________________________________________
Answer choice:  [C]: has no solution.
______________________________________________

Katy buys 3 dvds every two weeks. how many dvd's will she buy in 14 weeks?

Answers

21 DVDS because if u do 7x2=14 so u then do the same to the 3 DVDS which makes 21 because u again do 3x7=21

Answer:

21 dvds

Step-by-step explanation:

Set up a proportion in terms of DVDs to weeks and solve.

3/2 = x/14

(2)(x) = (3)(14)

2x = 42

x = 21

Therefore, Katy will buy 21 DVDs in 14 weeks.

A circle has a diameter with endpoints at –3 + 18i and 7 – 6i. Which point is also on the circle?

Answers

I found this on an answer to the same question 

Answer:

D. 14+11i

Step-by-step explanation:

Edge

Factor. x(3y−5)+3(3y−5)

Answers

x3y-x5+9y-15 hope this helps 

Answer:  The required factored form is [tex](x+3)(3y-5).[/tex]

Step-by-step explanation:  We are given to factor the following polynomial :

[tex]P=x(3y-5)+3(3y-5)~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]

We will be using the following factorization formula :

[tex]a(b+c)+d(b+c)=(a+d)(b+c).[/tex]

So, from expression (i), we get

[tex]P\\\=x(3y-5)+3(3y-5)\\\\=(x+3)(3y-5).[/tex]

Thus, the required factored form is [tex](x+3)(3y-5).[/tex]

Solve for x. x + 5 = 2x

Answers

x + 5 = 2x
subtract x from both sides:-

x - x + 5 = 2x - x

5 = x

Solution is x = 5

The solution to the equation x + 5 = 2x is x = 5.

We have,

To solve the equation x + 5 = 2x, we want to find the value of x that makes the equation true.

We start by isolating the variable x on one side of the equation.

In this case, we can do that by subtracting x from both sides of the equation.

By subtracting x from both sides, we have:

x + 5 - x = 2x - x

The x term on the left side cancels out, leaving us with:

5 = x

This means that x is equal to 5, and substituting x = 5 back into the original equation gives us:

5 + 5 = 2(5)

10 = 10

The equation is true, confirming that x = 5 is the correct solution.

Therefore,

The solution to the equation x + 5 = 2x is x = 5.

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M and N are the acute angles of an isosceles right triangle.

Select the true statements.

cosM = sinM
cosM = cosN
cosM = tanN
sinN = cosM
tanM = tanN

Answers

An isosceles triangle has two sides equal. Since it's also a right triangle , the angles will be 90°, 45°, 45°.
M = 45°
N = 45°

cos(45°) = sin(45°)
true

tan(45°) = tan(45°)
true
cos(45°) = cos(45°)
true

cos(45°) = tan(45°)
false

sin(45°) = cos(45°)
true










Find the critical value z subscript alpha divided by 2zα/2 that corresponds to the given confidence level

Answers

To find the critical value [tex]z_{\alpha/2}[/tex] that corresponds to 97% confidence level:

Step 1:
Subtract 0.97 from 1:

1 - 0.97 = 0.03

Step 2:
Divide 0.03 by 2:

0.03 / 2 = 0.015

Step 3:
Subtract 0.03 from 1:

1 - 0.015 = 0.985

Step 4:
From the normal distribution table, the z score that corresponds to a probability of 0.985 is 2.17.

Therefore, the critical value that corresponds to 97% confidence level is 2.17.
Final answer:

The critical value zα/2 that corresponds to a given confidence level can be found by subtracting the confidence level from 1, dividing by 2, and looking up this value in the Z-table. For a 90% confidence level, the corresponding zα/2 is approximately 1.645.

Explanation:

To find the associated critical value zα/2 for a given confidence level, you would first subtract the confidence level from 1, then divide by 2. This will give you α/2. You would then look up this value in the Z-table to find the corresponding critical value of z. Now, let's consider an example.

Assume a confidence level of 90%. We subtract this from 1, which gives us 0.10, and then dividing by 2 gives us 0.05. Now we look up 0.05 in the Z-table, and find that the corresponding value of z is approximately 1.645. Therefore, the critical value zα/2 that corresponds to a 90% confidence level is approximately 1.645.

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The degree of the polynomial function f(x) is 4.

The roots of the equation f(x)=0 are −6 , −2 , 1, and 3.

Which graph could be the graph of f(x) ? 

Answers

Answer:

option B

Step-by-step explanation:

The degree of the polynomial function f(x) is 4.

The roots of the equation f(x)=0 are [tex]−6 , −2 , 1,[/tex] and 3.

We are given with four roots. they are the x intercepts

x intercepts are [tex]−6 , −2 , 1,[/tex] and 3

The polynomial has degree 4, the polynomial goes up on both sides

We look at the graph that has x intercepts [tex]−6 , −2 , 1,[/tex] and 3 and both ends of the graph goes up

option B is correct

The graph that could be the graph of f(x) is;

The second graph which is the one at the top right

We are told that;

Degree of polynomial f(x) = 4; This means it has 4 roots

Roots of polynomial = -6, -2, -1 and 3

The roots of a polynomial simply means the values of x at which the function f(x) is equal to zero. This simply means the x- intercept is the root.

Thus, the x-intercept of the correct graph should be at;

x = -6; x = -2 ; x = -1 and x = 3

Looking at the given graphs, the only one that has its' x-intercepts at x = -6; x = -2 ; x = -1 and x = 3 is the second graph at the top right.

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Explain why the​ t-distribution has less spread as the number of degrees of freedom increases

Answers

The t-distribution has less extent as degrees of freedom increase since as increases less information is recognized the about or by the law of large numbers. As the degrees of freedom increases the critical t value drops that happens to the critical value of t for a particular alpha level when df increases in value. 

If Leslie has a total monthly budget of $4000 and spends $500 on a car payment, What percentage of her monthly budget is dedicated to the car payment?

Answers

500 / 4000 = .125= 12.5%

Answer:

12.5%

Step-by-step explanation:

We have been given that Leslie has a total monthly budget of $4000 and spends $500 on a car payment.

To find the percentage of her monthly budget is dedicated to the car payment, we will find 500 is what percent of 4000.

[tex]\text{Leslie's monthly budget dedicated to car payment}=\frac{500}{4000}\times 100\%[/tex]

[tex]\text{Leslie's monthly budget dedicated to car payment}=\frac{50}{4}\%[/tex]

[tex]\text{Leslie's monthly budget dedicated to car payment}=12.5\%[/tex]

Therefore, 12.5% of Leslie's monthly budget is dedicated to the car payment.

A graphics company charges $50 per hour to create a logo plus $250 for the ownership rights of the logo. A private contractor charges $75 per hour to develop a logo plus a $100 supply fee. Which equation can be solved to determine x, the number of hours after which the costs would be the same?

Answers

A. 50x + 250 = 75x + 100 is the correct answer

Answer:

A. 50x + 250 = 75x + 100

Step-by-step explanation:

edge 2022

An on-demand movie company charges $2.95 per movie plus a monthly fee of $39.95. Which expression represents the yearly cost for x movie rentals?

Answers

Answer:

2.95 x + 39.95 (12)

Hope this helps!!

Final answer:

The yearly cost for a student's movie rentals with a monthly subscription fee and a per-movie fee is expressed as $479.40 + $2.95x, where x is the number of movies rented.

Explanation:

The yearly cost for x movie rentals from an on-demand movie company that charges a monthly fee and a per-movie fee can be represented by an algebraic expression. To find this expression, we need to account for both the monthly fee and the cost per movie.

The monthly fee is $39.95, so over one year, this fee would be 12 times $39.95.

For each movie rented, there is an additional charge of $2.95. If x movies are rented over a year, this cost is x times $2.95.

Combining these two costs gives us the total yearly cost:

Yearly Cost = (12 \(\times\) $39.95) + ($2.95 \(\times\) x)

This can be simplified to:

Yearly Cost = $479.40 + $2.95x

which functons have graphs that are less steep than the graph of f(x)=2x^2

(select each correct answer)

h(x)= -2x^2
g(x)= -3x^2
m(x)= 3x^2
j(x)= -x^2
k(x)= x^2

Answers

The answers are D and E, I took this quiz as well

Answer:

[tex]k(x) = x^{2} \\j(x) = -x^{2}[/tex]

Step-by-step explanation:

The slope has to be steep and the ones given above are all greater than 2 except for k(x) and j(x).

Kyle bought a 5 pound pumpkin for $2.60. How much did he pay per pound?

Answers

0.52 per pound
2.60 divided by 5 equals 0.52
:P
0.52 per pound
2.60 divided by 5 equals 0.52

Suppose that 18​% of people have a dogdog​, 34​% of people have a cat​, and 88​% of people own both. What is the probability that someone owns a dog
or a cat

Answers

I believe that this should be as simple as adding 18% and 34% together since the problem utilizes the keyword "or":  18 + 34 = 52.

So, 52% of people have either a dog or a cat.

Which equation is a point slope form equation for line AB?

A.y+1=3/2(x-1)
B.y+1=-3/2(x-1)

Answers

we know that the slope will be -3/2. Here is what it looks like when done........

7x-y-17 = 0 Hope this helps!

Molly earns $8 per hour at her job. Last month, Molly worked for 45 hours. On her paycheck, Molly noticed that she paid $38.50 for federal income tax, $22.32 for Social Security, and $5.22 for Medicare. Molly's net income was

Answers

$293.96 is her income after deductions
Final answer:

Molly's gross income is $360, and after subtracting her total deductions ($66.04), her net income is $293.96. This demonstrates the difference between gross and net income.

Explanation:

To find Molly's net income, we will first need to calculate her gross earnings, and then subtract her deductions. Molly's gross earnings are her hourly wage multiplied by the number of hours she worked, so: $8/hr * 45 hours = $360.

Next, we add up Molly's deductions: $38.50 (federal tax) + $22.32 (Social Security) + $5.22 (Medicare) = $66.04.

Finally, to determine Molly's net income, we subtract her total deductions from her gross earnings: $360 - $66.04 = $293.96.

This example illustrates the concept of gross income versus net income. Gross income is the total amount earned before deductions, and net income is the amount left after deductions have been subtracted, which is the exact amount the employee receives in their paycheck.

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Population has a mean of 180 and a standard deviation of 24. a sample of 64 observations will be taken. the probability that the mean from that sample will be between 183 and 186 is

Answers

We use so called Central Limit Theorem as follows.

If the sample size is large enough, the sample mean would be normally distributed with a mean of µ and a standard deviation of σ/√n where µ and σ are the mean and standard deviation the random variable.

In this problem, µ = 180, σ = 24 and n = 64. Based off the Central Limit Theorem, the sample mean is normally distributed with a mean of 180 and a standard deviation of 24/√64 = 24/8 = 3.

Now let's convert the 183 and 186 into z scores. Formula for a z-score is
[tex]z= \frac{x-mean}{std} [/tex]
So the z-score for 183 is (183–180)/3=1.
The z score for 186 is (186 –180)/3 = 2.

Now, let's look up the z-table for the areas to the left of those two z scores. We can see that the area to the left of z = 1 is 0.8413 and the area to the left of z = 2 is 0.9772. The probability that the z is between 1 and 2 would be 0.9772 – 0.8413 = 0.1359.

That's also the probability that the sample mean is between 183 and 186. Thus the answer is 0.1359.

The probability that the sample mean is between 183 and 186 would be 0.1359.

What do you mean by standard deviation?

In statistics, Standard deviation is a measure of the variation of a set of values.

σ = standard deviation of a population

N = number of observations of population

X = mean

μ = population mean

It is given that the Population has a mean of 180 and a standard deviation of 24. a sample of 64 observations will be taken.

So, µ = 180, σ = 24 and n = 64.

By the Central Limit Theorem, the sample mean is normally distributed with a mean of 180 and a standard deviation of 24

Therefore, 24/√64

                 = 24/8 = 3.

Now let's convert the 183 and 186 into z -scores.

So, the z-score for 183 is (183–180)/3 = 1

The z-score for 186 is (186 –180)/3 = 2.

We can see that the area to the left of z = 1 is 0.8413

The area to the left of z = 2 is 0.9772.

The probability that the z is between 1 and 2 can be calculated as the difference between the area of z.

= 0.9772 – 0.8413

= 0.1359.

Thus, the probability that the sample mean is between 183 and 186 would be 0.1359.

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the area of a triangle is 56.4cm and the base is 12cm.What is the height of the triangle?

Answers

area of a triangle = 1/2 base x height

56.4 = 1/2 x 12 x height

56.4 = 6 x height

height = 56.4 /6 = 9.4cm


There are approximately 45 hundred species of mammals on Earth and 2.8 x 10 to the 4 species of fish. What is the difference in the number of species?
This is SCIENTIFIC NOTATION

Answers

Answer:

23500

Step-by-step explanation:

We are given that

Number of species of mammals on earth=approximately 45 hundred=4500

Number of species of fish=[tex]2.8\times 10^4=2.8\times 10000=28000[/tex]

We have to find the difference between the number of species of mammals and fish.

In order to find the difference in the number of species we will subtract number of species mammals from the number  of  species of fish.

Difference=28000-4500=23500

Hence, the difference between the number of species of mammals and fish=23500

Answer:

23,500

Step-by-step explanation:

45 hundred = 45 × 100 = 4,500

2.8 × 10^4 = 28,000

28,000 - 4,500 = 23,500

If PS || QR what is the measure of angle RSP?

Answers

5y + 14 and 8y -13 we can set equal to each other because they are adjacent angles. 5y + 14 = 8y -13, we are going to subtract 5y from both sides to get 14 = 3y -13. Now add 13 to both sides and get 3y = 27. Divide by 3, y = 9. 

Plug in 9 for 8y - 13 we get 8(9)-13 = 72- 13 = 59. 

The inside angles of triangles must equal 180 so now we have 3x + 2x + 1 + 59 = 180. Combine like terms you get 5x + 60 = 180. Subtract 60 from both sides, you get 5x = 120. Divide by 5, x = 24. This is NOT your answer; we are not done yet!

We must plug in again for the angle represented by 2x + 1. The middle letter tells you which one to plug in for (rSp). x = 24 so 2(24) + 1. 48 + 1 = 49.

Your answer is B. 49. degrees.

Option B is correct. The measure of m<RSP  is 49 degrees

From the diagram shown

3x + 2x + 1 + 8y - 13 = 180

5x + 8y - 12 = 180

5x + 8y = 180  + 12

5x + 8y = 192 ................. 1

Also, since PQ is parallel to PS, hence;

5y +14 = 8y - 13 (alternate interior angle)

5y - 8y = -13 - 14

-3y = -27

y = 27/3

y = 9

Substitute y = 9 into equation 1

5x + 8y = 192

5x + 8(9) = 192

5x + 72 = 192

5x = 192 - 72

5x = 120

x = 120/5

x = 24

Get the measure of <RSP

m<RSP = 2x + 1

m<RSP = 2(24) + 1

m<RSP = 48 + 1

m<RSP  = 49degrees

Hence the measure of m<RSP  is 49 degrees

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Help me with this question

Answers

Using the slope-intercept form of y = mx + b, just plug in for the values given by the graph.

Your Y-intercept (0, y), you plug in the y value as B. M is where you put your slope. 

So for the second one (top right), you have a Y-int of -2 or (0, -2) and a slope/m of 1/1 = 1. So your equation would be y = 1x - 2 or y = x - 2. 


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