Simplify:
(3-4i)(1+5i)-(2-i)



Show all of your work please

Answers

Answer 1
So first you want to do the multiplication.

(3-4i)*(1+5i)

So what you want to do is multiply everything inside the parenthesis by everything inside the other parenthesis.

Or,

3 * 1 + 3 * 5i + -4i * 1 + (-4i) * 5i

Or,

3 + 15i + -4i - 20i

Then,

3 + -9i

3 - 9i - (2 - i)

Open the parenthesis, and since it has a minus before it reverse the operator inside of the parenthesis.

3 - 9i - 2 + i

Or,

1 - 8i



Related Questions

The sum of two consecutive odd integers is 24. find the integers. which equation can be used to find the first integer n

Answers

Sorry, all I know is the answer. The answer would be 11 and 13.

Evaluate the expression when x = -15
-4x -11
A. -71
B. -49
C. 49
D. 71

Answers

Hi there! Because x equals a negative number and you are multiplying by -4, the answer will be positive. Therefore, A and B are eliminated, because those answers are negative and not positive. -4 * -15 is 60. 60 - 11 = 49. There. 49 is the answer to the problem. The answer is C.

graph y=4x please i need help

Answers

start from the origin and go over 4

The surface area of a cone is given by the formula
S = πl + πr2. Solve the formula for l.

Answers

Start my moving terms to one side of the equation to isolate the term with 'l' in it.

(pi)(l)=S- (pi)(r^2)

Then divide to get the 'l' term alone.

l = (S/(pi)) - r^2

Answer:

l = (S - πr²) / π

Step-by-step explanation:

The problem gives us the formula for the surface area of a cone S, we will solve the formula for l.

The formula is

S = πl + πr²

If we take the πr² to the other side, we get:

S - πr² = πl

Now we divide by π, and we get:

(S - πr²) / π = l

Therefore solving for l, we get that

l = (S - πr²) / π.

log(-2a+9)=log(7-4a)

please helpp!!

Answers

Verify each of the solutions by substituting them back into the original equation log(−2a+9)=log(7−4a)log(-2a+9)=log(7-4a) and solving. In this case, all solutions were found to be valid.a=−1
assuming it's the same base log on either side you can just set the inside equal.

-2a + 9 = 7 - 4a
-2a + 4a = 7 - 9
2a = -2
a = -1

Can somebody help me with this?

Answers

The answer is choice D because we are adding the two angles UVW and WVX to form the larger angle UVX. The angle addition postulate basically says "glue two adjacent angles together and you can form a larger angle" more or less. It is similar to the segment addition postulate. 

Sasha can mow 3/8 of an acre of grass in 45minutes.how many acres of grass does Sasha now per hour?

Answers

keeping in mind that an hour is 60 minutes.

[tex]\bf \begin{array}{ccll} \stackrel{acre}{grass}&\stackrel{minutes}{time}\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ \frac{3}{8}&45\\ g&60 \end{array}\implies \cfrac{\frac{3}{8}}{g}=\cfrac{45}{60}\implies \cfrac{\frac{3}{8}}{\frac{g}{1}}=\cfrac{45}{60}\implies \cfrac{3}{8}\cdot \cfrac{1}{g}=\cfrac{45}{60} \\\\\\ \cfrac{3}{8g}=\cfrac{45}{60}\implies 180=360g\implies \cfrac{180}{360}=g\implies \cfrac{1}{2}=g[/tex]

Plz help! True or False. The response variable is plotted along the y-axis.

Answers

True. The response variable (also known as the dependent variable) is always on the y axis while the independent variable is always on the x axis.

Molly walked 3.45 miles on a hike. Her sister walked 1.23 miles. Her brother walked 0.85 miles. How much farther did Molly walk than her brother and sister combined? 0.38 miles 1.37 miles 2.22 miles 5.53 miles

Answers

1.23+0.85 = 2.08 miles
3.45-2.08= 1.37 miles, which is the answer

The distance walked together, is the sum of their distances.

Molly walked 1.37 miles farther  than her brother and sister

The given parameters are:

[tex]\mathbf{Molly = 3.45\ miles}[/tex]

[tex]\mathbf{Sister = 1.23\ miles}[/tex]

[tex]\mathbf{Brother = 0.85\ miles}[/tex]

The combined distance walked by her brother and her sister is:

[tex]\mathbf{Both = Sister + Brother}[/tex]

Substitute known values

[tex]\mathbf{Both =1.23\ miles + 0.85\ miles}[/tex]

Evaluate like terms

[tex]\mathbf{Both =2.08\ miles}[/tex]

The distance Molly walked farther is calculated as follows:

[tex]\mathbf{Farther = Molly - Both}[/tex]

Substitute known values

[tex]\mathbf{Farther = 3.45\ miles - 2.08\ miles}[/tex]

Evaluate like terms

[tex]\mathbf{Farther = 1.37\ miles}[/tex]

Hence, Molly walked 1.37 miles farther  than her brother and sister combined

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What is the simplified form of the following expression? 7[6^2÷(5^2-4^2 )+8]
&

(3/4)^3

Answers

The 1st one is 84 and the 2nd one is 27/64. Hope this helped!

If the slope and a point of a line are given, then the equation of the line can be written in point-slope form.

True
False

Answers

The answer is true .
Becasue Point - slope form : y - y1 = m ( x - x1 )
                                             ( x1 , y1 ) is the point given ; m = slope is given .
 
the answer is true...

Solve the inequality 3(x + 1) + 2(x + 2) > 0. A. x < -7/5 B.x > -7/5 C. x < 7/5 D.x > 7/5

Answers

3x+3+2x+4>0
5x>-7
x>-7/5
B

Answer:

3x+3+2x+4>0

5x>-7

x>-7/5

B

Step-by-step explanation:

By graphing the system of constraints, find the values of x and y that maximize the objective function. 25<=x<=75 y<=110 8x+6y=>720 y=>0 minimum for c=8x+5y a. c=100 b. c=225 2/3 c. c=633 1/3 d. c=86 2/3

Answers

Sketch the graph

x = 25
x = 75
y = 110
6y = 720 - 8x

and C = 8x + 5y

The minimum point for C is the point of intersection between 8x + 6y = 720 and x = 25

Substitute x = 25 into 8x + 6y = 720 we have:
8(25) + 6y = 720
200 + 6y = 720
6y = 720-200
6y = 520
y = ²⁶⁰/₃

Substitute x = 25 and y = ²⁶⁰/₃ into C
C = 8(25) + 5(²⁶⁰/₃) = 633¹/₃

Answer: Option C


Please help!!!!!!!!!
does x/x+6 simplify to 1/6 explain why or why not

Answers

No, it does not.

x and x + 6 are both prime and cannot be factored.

There are no common factors to divide out.

x over x + 6 is already simplified.

If you substitute in a value for x, the fraction will not be equal to 1/6.

The expression x/(x+6) does not simplify to 1/6 because there are no common factors in the numerator and denominator that can be canceled out.

The expression x/(x+6) does not simplify to 1/6. To understand this, we need to recognize that simplification involves reducing a fraction to its simplest form by factoring or canceling common factors in the numerator and the denominator.

If x were a factor in both the numerator and the denominator, then we could simplify by canceling out the x's.

However, in the expression x/(x+6), the term x+6 in the denominator cannot be simplified with x in the numerator because they are not factors of each other. They are connected by the addition of 6, which means that there are no common factors to cancel out.

The only way x/(x+6) would simplify to 1/6 is if 'x' were to be somehow removed from the denominator, leaving only the constant 6. But since this is not the case, the fraction cannot be simplified to 1/6. Therefore, the original expression is already at its simplest form unless a specific value is given for x, which may then allow further simplification.

A long piece of wood of length 2.0 m is broken into 4 pieces with two pieces of length a and the other two pieces of length
b. the four pieces are put together to form a rectangle. find b if your aim is to have a rectangle with the maximum area.

Answers

Best Answer: 2a+2b=4 a+b=2 a=2-b Let area of the rectangle is A so A=a*b A=(2-b)b A=2b-b^2 taking derivative of both sides of above equation with respect to b we get, dA/db=2-2b for maximum A dA/db=0 2-2b=0 b=1 so, b=1 meter

The value of b is 0.5 m if your aim is to have a rectangle with the maximum area.

What is the area of the rectangle?

It is defined as the area occupied by the rectangle in two-dimensional planner geometry.

The area of a rectangle can be calculated using the following formula:

Rectangle area = length x width

It is defined as the two-dimensional geometry in which the angle between the adjacent sides are 90 degree. It is a type of quadrilateral.

It is given that:

A long piece of wood of length 2.0 m is broken into 4 pieces with two pieces of length a and the other two pieces of length b.

Total wooden length:

2a + 2b = 2

a + b = 1

Area = ab  

A = a(1 - a)

dA/da = 0

1 - 2a = 0

a = 0.5 m

b = 0.5 m

Thus, the value of b is 0.5 m if your aim is to have a rectangle with the maximum area.

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Grandpa schmidt is 75 years old. this is 9 years less than seven times the age of junior schmidt. how old is junior

Answers

Grandpa's age is 75 years
Seven times the age of junior = age of grandpa + 9 jears = 75 + 9 = 84 years
Hence, the age of junior will be 84 / 7 = 12 years. (Since 84 is seven times his age, you have to devide by seven).
--> Junior is 12 years old.

I hope I've been helpful, MarkV

How many ways can six friends be arranged around a circular dinner table?

Answers

A question such as this one is a little tricky since the people seated are not in a straight line. 

For a circular table seating question, (n-1)! formula is used. Without restrictions 5! people can be seated. 

You might be wondering why it is not 6!, this is because the first person will the the 6 person so you are accounting for the same person twice. 

Hope I helped :) 

if (2x-3) and (x+5) are multiplied to form the trinomial ax^2 +bx+c, what is the value of b

Answers

b will be -3 + 2*5  = 7

After using the trinomial The required value of b is 7.

What is a trinomial?

An algebraic expression with three terms is called a trinomial. One or more terms in an algebraic expression each have variables and constants. These expressions use separators like +, -,, and that are symbols or operations. This algebraic expression encompasses polynomials, monomials, binomials, and trinomials. An algebraic expression that is created by squaring a binomial expression is known as a perfect square trinomial. It takes the shape of ax2 + bx + c. Real numbers a, b, and c are present here, and a 0. Take the binomial (x + 2), for instance, and multiply it by (x + 2). The outcome is equal to x2 + 4x + 4.

Given, [tex](2x-3)[/tex] and [tex](x+5)[/tex] are multiplied [tex]= (2x-3)(x+5)[/tex]

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

                                                                   [tex]= 2x^{2} +10x -3x-15\\= 2x^{2} +7x-15[/tex]

Now, comparing the calculated expression [tex]2x^{2} +7x-15[/tex] with the given equation  [tex]ax^{2} +bx+c[/tex] , then we get, [tex]b=7[/tex]

Therefore, the required value  [tex]b[/tex] is 7.

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Mary has a total of 23 coins made up of nickels and quarters that made a sum of $3.15. How many more nickels than quarters does she have?
A) 10
B) 3
C) 8
D) 7
E) none of these

Answers

Nickels n
quarters q
I: 3.15=n*0.05+q*0.25
II: n+q=23

isolate n in II:
n+q=23
n=23-q

substitute n in I:
3.15=n*0.05+q*0.25=
3.15=(23-q)*0.05+q*0.25
3.15=(23-q)*(1/20)+(q/4)
3.15=(23/20)-q/20+(q/4)
3.15=1.15-(4*q/20)
2=q/5
10=q

insert q=10 into II:
n+q=23
n+10=23
n=13

so c) 3 more nickels than quarters

A spinner has 4 equally-sized sections, labeled A, B, C, and D. It is spun and a fair coin is tossed. What is the denominator of the simplified fraction representing the probability of spinning “C” and flipping “heads”? P(spinning C and flipping heads) =

Answers

I think.... (Not positive) it would be 1/12... 

Answer:

1/8

Step-by-step explanation:

Which does not describe the same situation?

Answers

y=3+6x is the only one that doesn't mach because the graph and the work problem is y=2+6x

Answer:

y = 3+6x

Step-by-step explanation:

Let us substitute x = 0, then we get

y = 3

This is not the case as the graph clearly shows that when x = 3, then y = 2

y = 2+6x

when x = 0 then y = 2 which valid from the graph

Now put x values from the table into the equation

y = 2+6×-1

⇒y = -4

x = 0 already solved

x = 2

y = 2+6×2

⇒y = 14

All the values fit in the equation. So, the bottom two options are valid.

Hence, the first equation is not valid.

The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds. the probability of a player weighing less than 250 pounds is closest to:

Answers

Given:
μ = 200 lb, the mean
σ = 25, the standard deviation

For the random variable x = 250 lb, the z-score is
z = (x-μ)/σ =(250 - 200)/25 = 2

From standard tables for the normal distribution, obtain
P(x < 250) = 0.977

Answer: 0.977

Using the normal distribution, it is found that there is a 0.9772 = 97.72% probability of a player weighing less than 250 pounds.

Normal Probability Distribution

In a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

It measures how many standard deviations the measure is from the mean. After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X.

In this problem:

The mean is of [tex]\mu = 200[/tex].The standard deviation is of [tex]\sigma = 25[/tex].

The probability of a player weighing less than 250 pounds is the p-value of Z when X = 250, hence:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{250 - 200}{25}[/tex]

[tex]Z = 2[/tex]

[tex]Z = 2[/tex] has a p-value of 0.9772.

0.9772 = 97.72% probability of a player weighing less than 250 pounds.

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Darryl has $5 left in his pocket. He spent $16 on a book, $20 on a compact disc, and $2 on a magazine. How much money did he have at the beginning of the day?

Answers

he had 43 dollars at the beginning of the day

Darryl had $43 at the beginning of the day.

Let's denote the initial amount of money Darryl had as [tex]\( M \)[/tex].

He spent $16 on a book, which we can denote as [tex]\( S_{book} = \$16 \)[/tex].

He spent $20 on a compact disc, which we can denote as [tex]\( S_{CD} = \$20 \)[/tex].

He spent $2 on a magazine, which we can denote as [tex]\( S_{magazine} = \$2 \)[/tex].

He has $5 left at the end of the day, which we can denote as [tex]\( L = \$5 \)[/tex].

The total amount spent, [tex]\( S_{total} \)[/tex], is the sum of the amounts spent on the book, the compact disc, and the magazine:

[tex]\[ S_{total} = S_{book} + S_{CD} + S_{magazine} \][/tex]

[tex]\[ S_{total} = \$16 + \$20 + \$2 \][/tex]

[tex]\[ S_{total} = \$38 \][/tex]

The initial amount of money Darryl had, [tex]\( M \)[/tex], is the sum of the total amount spent and the amount left:

[tex]\[ M = S_{total} + L \][/tex]

[tex]\[ M = \$38 + \$5 \][/tex]

[tex]\[ M = \$43 \][/tex]

The number of tickets sold for a school event is 330. Let a represent the number of adult tickets sold and s represent the number of student tickets sold. The cost of a student ticket is $6 and the cost of an adult ticket is $10. In total, $2380 was taken in from ticket sales. Write a linear system to represent the information

Answers

The linear system is 6s+10a = 2380.

s represents student tickets and a represents adult tickets, and the total amount collected from the tickets is $2380.

What is the linear and non-linear system?

Linear means something associated with a line. All the linear equations are used to construct a line. A non-linear equation is such that does no longer form a direct line. It looks as if a curve in a graph and has a variable slope price.

How do you realize a system is linear?

If the connection between y and x is linear (instantly line) and crossing through starting place then the system is linear. If you locate any time t at which the system is not linear then the system is non-linear.

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Final answer:

To represent the ticket sales information as a linear system, we use two equations: a + s = 330 for the total number of tickets, and 10a + 6s = 2380 for the total revenue from ticket sales.

Explanation:

The question involves writing a linear system of equations based on the information provided about ticket sales for a school event. Given that 330 tickets were sold in total, comprising adult tickets (a) and student tickets (s), and that the total revenue from these tickets was $2380, with student tickets priced at $6 each and adult tickets at $10 each, we can represent this scenario with two equations.

The first equation represents the total number of tickets: a + s = 330.

The second equation represents the total revenue: 10a + 6s = 2380.

This linear system can be solved to find the values of a and s, which would give us the number of adult and student tickets sold, respectively.

Which statement best describes how to determine whether f(x)=9-4x^2 is an odd function

Answers

If you want to know if a function is odd, you look at the exponents/degrees it has; if they're all even it's an even function if they're all odd it's an odd function if it has a mix of both even and odd its neither
the function 9-4x^2 only has one x with an exponent of two making it even

Find the GCF of the following monomials.
-50m⁴ n⁷ and 40m² n¹⁰

Answers

Greetings!

We can factor this expression/ the GCF is:
[tex]-10m^2n^7[/tex]

[tex](-10m^2n^7)(5m^2-4n^3)[/tex]

Hope this helps.
-Benjamin

Answer:  [tex]10\ m^2\ n^7[/tex]

Step-by-step explanation:

The given monomials : [tex]-50m^4n^7\text{ and }40 m^2 n^{10}[/tex]

The prime factorization of coefficients :-

[tex]50=5\times5\times2\\\\40=5\times2\times2[/tex]

GCF(50, 40)=[tex]2\times5=10[/tex]

The greatest common degree of m is 2

The greatest common degree of n is 7

So , the GCF of the given monomilas will be :-

[tex]10\ m^2\ n^7[/tex]

I can't figure this out I need helppp!!!!

Answers

A. s equals c plus 4. C'mon that was easy.

How many solutions are ther to this equation.

Answers

There are multiple solutions and they will vary. 

Hope this helps!
Can u plz mark me as brainliest? I really need it!

The correct scientific notation for the number 0.00050210 is:

Answers


5.0210 × 10-4





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Final answer:

The correct scientific notation for the number 0.00050210 is 5.0210 x 10^(-4).

Explanation:

The correct scientific notation for the number 0.00050210 is 5.0210 x 10-4. In scientific notation, the decimal point is moved to the right, and the number is multiplied by a power of 10. The exponent indicates how many places the decimal point was moved.

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can somebody help me with these please ☺

Answers

Left problem
This problem can be solved with a proportion.
Use x for the unknown height of the tree.
If 2 foot tall casts a shadow 5 ft long as x foot tall casts a shadow 55 ft long.

2/5 = x/55

Cross multiply:

5x = 110

x = 22

The tree is 22 ft tall.

Right problem
Look at the table. The input goes up by 1 each step. The corresponding output goes up by 3 each step. For each change of 1 in the input, the output changes 3.

Now look at the table, and fill in the output for inputs of 2, 1, and 0.
Each time the input goes down by 1, the output goes down by 3.
We have input 3 with output 10.
Then we can calculate:
input 2 with output 7
input 1 with output 4
input 0 with output 1

Since for each change of 1 in the input, the output changes 3, the slope is 3.

That means the equation is

y = 3x + b

b is the y-intercept. Since we calculated the output of 1 for an input of 0, the y-intercept is 1.

The equation is

y = 3x + 1

That means the expression for the output is 3n + 1

Answer: D. 3n + 1
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