show the following propositions using a direct proof, using cases. (a) proposition. if n ∈ z, then 5n 2 3n 7 is odd.

Answers

Answer 1

In both the cases when n is even and when n is odd, the expression is odd, we can conclude that if n ∈ Z, then [tex]5n^2 + 3n + 7[/tex]is odd.

To prove the proposition "if n ∈ Z, then[tex]5n^2 + 3n + 7[/tex]is odd" using a direct proof with cases, we consider two cases: when n is even and when n is odd.

Case 1: n is even.

Assume n = 2k, where k ∈ Z. Substituting this into the expression, we have [tex]5(2k)^2 + 3(2k) + 7 = 20k^2 + 6k + 7[/tex]. Notice that [tex]20k^2[/tex] and 6k are both even since they can be factored by 2. Adding an odd number (7) to an even number results in an odd number. Hence, the expression is odd when n is even.

Case 2: n is odd.

Assume n = 2k + 1, where k ∈ Z. Substituting this into the expression, we have [tex]5(2k + 1)^2 + 3(2k + 1) + 7 = 20k^2 + 16k + 15[/tex]. Again, notice that [tex]20k^2[/tex]and 16k are even. Adding an odd number (15) to an even number results in an odd number. Therefore, the expression is odd when n is odd.

Since we have covered all possible cases and in each case, the expression is odd, we can conclude that if n ∈ Z, then 5n^2 + 3n + 7 is odd.

To know more about even refer to-

https://brainly.com/question/2289438

#SPJ11


Related Questions

Can someone please tell me what is the solution

Answers

Answer:

[tex] \frac{1}{4} \tan {}^{4}(x) + c[/tex]

If 95% of students are coming to school tomorrow, what is the complement?

Question 5 options:

A. 95%


B. 100%


C. 1%


D. 5%

Answers

Answer:

d

Step-by-step explanation:

can you help me with this question According to Frost in his poem "The Road Not Taken," what kind of difference did taking one road over another road make? A. It made a good difference, B. It made a bad diference, c. Frost does not say

Answer:

the answer is d

Step-by-step explanation:

it only takes 5% to get to 100%

Triangles are similar Find the value of x.
Please help Thank you in advanced ​

Answers

Answer:

x=36

Step-by-step explanation:

14/42=12/x

14x=12(42)

14x=504

x=36

Which of these relations is a function?
X
y
9
10
-18
2
2
4
-12
2
20
3
y
17
19
-2
20
6
-10
X
1
-10
y
18
17
12
14
1
16
х
15
8
y
-8
5
17
0
-13
15

Answers

Answer:

I think the answer is 2 4

Step-by-step explanation:

Table {1} and table {2} represent the relations that are functions.

What is function? What is modulus function?

A function is a relation between a dependent and independent variable. We can write the examples of functions as -

y = f(x) = ax + b

y = f(x, y, z) = ax + by + cz

We can define the modulus function as -

|x| = - x     {x < 0}

|x| = x       {x > 0}

Given is to identify which of the relations are functions.

For a relation to be a function, it should have unique value of {y} for a unique value of {x}. One value of {x} cannot have more than one values at the same time. We can see in the image attached that only table 1 and 2 represent such relations. So, we can conclude that relation {1} and {2} represent the functions.

Therefore, table {1} and table {2} represent the relations that are functions.

To solve more questions on functions, visit the link below-

https://brainly.com/question/30194223

#SPJ7

Due in 20 please help

The polygons are similar. Find the values of
the variables. Write an equation and solve,
showing ALL the work.

Answers

It tells you they are similar. This means the angles are the same, and the sides are proportionate.

Look at the 12 and 4 at the very bottom. This tells you the ratio of the sides. Since 12 / 4 = 3, you can find y with 2 * 3 which is 6.

From that, you also know that 3z = 3y - 2. Substitute the value of y in and you can find z.

Corresponding angles are exactly the same. which means, (3x)° = 100°

You should get x = 33 1/3, y = 6, z = 5 1/3

2
What is the system by which we can convert between
metric and customary units?
A None; it's different for every unit
B A base-6 algorithm
C A base-10 system
D A mix between multiplication and division

Answers

Answer:

i think that it's A.

Step-by-step explanation:

Metric units are the standard units of measurement while customary units are derived from the metric units. To convert between both units, you need a mix between multiplication and division.

Take distance as an instance.

The metric unit of distance is meters.

The customary units are: feet, inches, yards, miles, etc.

To convert from meters to feet, we multiply by 3.281

For instance:

[tex]2\ meters = 2 \times 3.281\ feet[/tex]

[tex]2\ meters = 6.562\ feet[/tex]

To convert from feet to meter, we divide by 3.281.

For instance:

[tex]6.562\ feet = \frac{6.562}{3.281}\ meters[/tex]

[tex]6.562\ feet = 2\ meters[/tex]

Hence, option (d) is true

Read more about metric and customary units at:

https://brainly.com/question/346695

How do you solve for x and y?

Answers

Answer:

x = 100, y = 50

Step-by-step explanation:

Make a system of equations:

First, you know that x + y degrees and 30 degrees are on a line together, they add up to 180 degrees:

x + y + 30 = 180

x + y = 150

Next, the interior angles of a triangle always add up to 180 degrees, and since 2y, x/2, and 30 are all the angles in a triangle, you have:

2y + x/2 + 30 = 180

x/2 + 2y = 150

Now, all you have to do is solve the system of equations.

To start, multiply the second equation by 2 to get rid of the fraction:

x + 4y = 300

Then, you can subtract the two equations:

x + 4y = 300

- (x + y = 150)

3y = 150

divide both sides by 3

y = 50

substitute y = 50 into the equation x + y = 150:

x + 50 = 150

x = 100

Please help me 15 points it’s worth it please help me on this question

Answers

Answer:

last answer

Step-by-step explanation:

The altitude of an airplane is decreasing at a rate of 40 feet per second. What is the change in altitude of the airplane over a period of 20 seconds?

Answers

Answer:

Step-by-step explanation:

-40t

-40(20)

-800 ft

GIVING BRAINLIEST!!!

Answers

Answer:

i think its 78.5 but the answers not on there the closest one there to it is 76.5 so just put that one

Step-by-step explanation:

89+67
berapakah jawapan nya​

Answers

Answer:

156

Step-by-step explanation

fgcfgvhvcfgvxxbbhhcx

Answer:

Jawapan kepada 89 + 67 = 156

Solve by elimination:
9x + 4y = 97
9x + 6y = 123
14
15'
B (5, 13)
(13,5)
D (1, 22)

Answers

Answer:

B (5, 13)

Step-by-step explanation:

9x + 4y = 97

9x + 6y = 123

To solve by elimination, we want to eliminate a variable. To do this, we must make one variable cancel out.

First, we can see that both equations have 9x. To cancel out x, we must make one of the 9x's negative. To do this, multiply each term in the equation by -1.

-1(9x + 6y = 123)

-9x - 6y = -123

This is one of your equations. Set it up with your other given equation.

9x + 4y = 97

-9x - 6y = -123

Imagine this is one equation. Since every term is negative, you will be subtracting each term.

9x + 4y = 97

-9x - 6y = -123

___________

0x -2y = -26

-2y = -26

To isolate y further, divide both sides by -2.

y = 13

Now, to find x, plug y back into one of the original equations.

9x + 4(13) = 97

Multiply.

9x + 52 = 97

Subtract.

9x = 45

Divide.

x = 5

Check your answer by plugging both variables into the equation you have not used yet.

-9(5) - 6(13) = -123

-45 - 78 = -123

-123 = -123

Your answer is correct!

(5, 13)

Hope this helps!

Smiths bike shop rents bikes for $10
plus $4 per hour. Anita paid $22 to
rent a bike. How many hours did
she rent the bike for? Write an
equation to represent this situation
and then solve.

Answers

10+(4x3)= $22 (How much she rent the bike for)

solve each system of eaquasions x+4y=4 -x+2y=8​

Answers

x + 4y = 4
-x + 2y = 8


x + 4y - x + 2y = 4 + 8

6y = 12

y = 2


x + 4(2) = 4
x + 8 = 4
x = -4

(x,y)
(-4,2)

Answer:

(-4, 2)

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right  

Distributive Property

Equality Properties

Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of Equality

Algebra I

Terms/CoefficientsCoordinates (x, y)Solving systems of equations using systems

Step-by-step explanation:

Step 1: Define Systems

x + 4y = 4

-x + 2y = 8

Step 2: Rewrite Systems

x + 4y = 4

[Subtraction Property of Equality] Subtract 4y on both sides:                    x = 4 - 4y

Step 3: Redefine Systems

x = 4 - 4y

-x + 2y = 8

Step 4: Solve for y

Substitution

Substitute in x:                                                                                                 -(4 - 4y) + 2y = 8[Distributive Property] Distribute negative:                                                   -4 + 4y + 2y = 8Combine like terms:                                                                                        -4 + 6y = 8[Addition Property of Equality] Add 4 on both sides:                                    6y = 12[Division Property of Equality] Divide 6 on both sides:                                y = 2

Step 5: Solve for x

Define original equation:                                                                                x + 4y = 4Substitute in y:                                                                                                 x + 4(2) = 4Multiply:                                                                                                            x + 8 = 4[Subtraction Property of Equality] Subtract 8 on both sides:                       x = -4

E = MV^2 ÷ 2 + mgh, Make V Subject of the formula​

Answers

Answer:

[tex] \red{ \bold{ V = \sqrt{\frac{2(E - mgh)}{M}}}}[/tex]

Step-by-step explanation:

[tex]E = MV^2 ÷ 2 + mgh \\ \\ E - mgh = MV^2 ÷ 2 \\ \\ 2(E - mgh)= MV^2 \\ \\ \frac{2(E - mgh)}{M}=V^2 \\ \\ \sqrt{\frac{2(E - mgh)}{M}} = V \\ \\ \red{ \bold{ V = \sqrt{\frac{2(E - mgh)}{M}}}}[/tex]

An account earns simple interest.
$600 at 5% for 2 years

a.Find the interest earned.
$___

b.Find the balance of the account.
$___



Please answer and give an explanation with your response. I will mark the correct and quickest answer BRAINLIEST!!!

Answers

Answer:

600×100/5×2=

6\10=3/5

Answer:

A is $60

B is $660

Step-by-step explanation:

For A, you move the decimal in 5% 2 over so it is 0.05. You then multiply 0.05 by 600, multiply that answer by 2, and you'll get $60.

Sorry I'm not sure how to do B, I looked up the answer to that one.

4. Six numbers are shown.
1.25, -1.5, -0.75,
34,
2 6/8,
5/4
Place each number in its correct location on the number line.

Answers

Step-by-step explanation:

sorry i couldn't solve the last and the last second one

Was it helpful?

comment down

If there is any kind of suspicious mistake

then sorry

What is 631.051 as a fraction
sorry if that doesnt make sense.

Answers

Answer:

631 and 51/1000

Step-by-step explanation:

Well I need the help in this last question I will mark brain list if you got it right

Answers

Answer:

6x−11y+15

Step-by-step explanation:

Distribute the Negative Sign:

=5x−6y+7+−1(−x+5y−8)

=5x+−6y+7+−1(−x)+−1(5y)+(−1)(−8)

=5x+−6y+7+x+−5y+8

Combine Like Terms:

=5x+−6y+7+x+−5y+8

=(5x+x)+(−6y+−5y)+(7+8)

=6x+−11y+15

Answer:

6x−11y+15

I hope I helped!!

(5x-6y+7) -(-x +5y -8)
=5x-6y+7+x-5y+8
=6x -11y +15
Hope it helps you (^_^)

Delia takes out a loan to buy a car for $18,000 with an interest rate of 6.5%. The amount of interest Delia will have to pay is $4,680. Write and solve an equation to determine the number of months her loan is for. Show all of your work and explain how you got your number of months.

Answers

Answer:

Delia pays $4,680 in 4 months

Step-by-step explanation:

Equation:

18,000 * 6.5% = 1170

4680 ÷ 4 = 1170

So, the answer is 4 months this is the equation.

Hope this helps! :)

heres a pic of my dog :) her name is tess

Answers

Answer:

She is so adorable

Step-by-step explanation:

Very adorable doggo

Answer:

She's adorable!! What type of dog is she?

Step-by-step explanation:

I have two rottweilers and I love them sooooo much <3

Hi! PLS HELP ITS 30 POINTS!! Thanks!
A soda bottle holds 1.5 liters of soda. How many milliliters does the bottle hold?

15 millimeters
150 millimeters
1,500 millimeters
15,000 millimeters
Pls help!
Imma report u if its something off the topic!
Thanks again!
(its not b i tried it and got it wrong!! )

Answers

Answer:

1,500 millimeters

Step-by-step explanation:

1 litre = 1000 millilitre.

Try 1,500.

What is the scientific notation for .000472

Answers

Answer:

The scientific notation for 0.000472 is 4.72 * [tex]10^{-4}[/tex].

que volumen ocupará 600 g de agua?

Answers

Answer:

Step-by-step explanation:

600 ml

10.
Write a rule for the linear function in the graph.

A. y = 4/5x + 2

B. y = -5x - 2

C. y = 5/4x - 2

D. y = -4/5x + 2

Answers

Answer:

D. y = -4/5x + 2

Step-by-step explanation:

Graph the line using the slope and y-intercept, or two points.

Slope:  

4

5

y-intercept:  

(

0

,

2

)

x

y

0

2

5

2

0

can someone please help me u can just do 5 and explain please


¿Puede alguien ayudarme? Puedes hacer 5 y explicar por favor.

Answers

Answer:

i only can explain until number 7

i am sorry

maybe that help you

pls help ty !
question is in the pic

Answers

Yes the answer is correct because you are adding 2 perfect squares and you get the same answer !

Answer:

He is not correct

Carlos got 5/6 of the test questions correct. This was 15 questions. How
many questions were on the test?

Answers

Answer:

5/6 is about a 84%, and 84% of 15 questions is 12.6. so the teacher just made the grading simplified

Step-by-step explanation:

Find the volume of the figure.
10 cm
8 cm
10 cm
14 cm
10 cm
8 cm
cubic centimeters

Answers

Answer:

60 cm³

Step-by-step explanation:

Step-by-step explanation:

=896000 is the answer

method -10x8x10x14x10x8

️️

Christine has her own dog -walking business. She Charges her customers $20 per day to walk their day

Answers

Answer:

y= money made

x = amount of dogs walked

equation- y = 20x

for the table name # of dogs walked on the right and money earned on the left.

for the left put 1 2 3 4 5 6 7 and 8

1 goes with 20

2 goes with 40

3 with 60

4 with 80

5 with 100

6 with 120

7 with 140 and

8 with 160

Step-by-step explanation:

Other Questions
Mr. Smith, the special education teacher, called Tim's parents to schedule a meeting to update information on Tim's progress on his IEP and to set goals for the upcoming year. This type of meeting is called a/an: Adverse impact (Al) is a test characteristic where differential outcomes vary as a function of a protected-class status variables (i.e., race, sex, color, religion, national origin, age, and disability; Arthur, Doverspike, Barrett, & Miguel, in press). This is distinct from subgroup differences which reflect group mean differences on certain tests; Al on the other hand is a legal term that refers to differential outcomes for different groups (Arthur et al., in press). Despite being distinct, these constructs are highly related; subgroup differences on predictor tests very often lead to Al. Many authors have proposed a variety of solutions for avoiding Al in employment decisions (Campion et al., 2001; Ployhart & Holtz, 2008; Sackett, Schmitt, Ellingson, & Kabin, 2001), though not all options are legal and/or valid. Maintaining equilibrium between minimizing Al and maximizing validity has been referred to as the diversity-validity dilemma (Ployhart & Holtz, 2008).What isMeant by differential outcomes If point a (-8, 9) was rotated clockwise 180o about the origin, what would its new coordinates be? Fellow-citizens, above your national, tumultuous joy, I hear the mournful wail of millions! whose chains, heavy and grievous yesterday, are, to-day, rendered more intolerable by the jubilee shouts that reach them. If I do forget, if I do not faithfully remember those bleeding children of sorrow this day, may my right hand forget her cunning, and may my tongue cleave to the roof of my mouth! To forget them, to pass lightly over their wrongs, and to chime in with the popular theme, would be treason most scandalous and shocking, and would make me a reproach before God and the world. My subject, then, fellow-citizens, is American slavery. I shall see this day and its popular characteristics from the slaves point of view.Which best describes why this is an example of inductive reasoning?It starts with details and uses them to support a more sweeping statement.It makes an assertion, then counters arguments against that assertion.It defends an argument with carefully researched facts and excerpts.It uses an anecdote to support a broad claim about the injustices of slavery. who is ymca's target market?who are ymca's end-users?who are ymca's donors? You are raising up a big bucket of water from a 22.5 m deep well. The combined mass of the water and the bucket is 11.3 kg. The bucket is attached to a heavy duty steel chain. The mass of the chain is 17.9 kg. How much work do you perform during the lifting process? Tries 0/12 If it takes 1.75 minutes for you to raise the bucket of water out of the well, then what was your average power? whats the main idea of the crusades speech How does bisclavret communicate with the king when he's in wolf form? Does he whimper? In general, we can conclude that with increasing economic development and wealth, a country tends to use __________ water per person. Ramon is six years younger than 4 times his brothers age. Oh f his brother is 5 year old, how old is Ramon Round your answer to the nearest percent. Assessingis based on more than just numbers; it requires seeing how yourbody composition is changing.O muscle massO weight lossO physical perfectionO diabetes risk Elnora is exploring her native Greek islands. She notices a dark object on the horizon and realizes that it must be a very distant ship. Her depth perception was assisted by the monocular cues for relative size and ________. A smart-phone is thrown upwards from the top of a 384-foot building with an initial velocity of 32 feet persecond. The height h of the smart-phone after t seconds is given by the quadratic equationh 16t + 32t + 384. When will the smart-phone hit the ground how many 2/7 are in 150 People who are allergic to bee stings are actually having a response to the antibodies produced by their immune system when they are stung. This is called anaphylaxis. Most people who end up having a bee sting allergy did not have anaphylaxis the first time they were stung. It is only upon the second sting, or subsequent stings that they have an allergic response. Explain this phenomenon. a. After encountering the allergen, B cells create B-cell receptors on their surface that can bind to it more quicklly upon subsequent exposures to the allergen b. More antibodies (IgE binding to mast cells and resulting in their degranulation) on second exposure results in more infiammation causing anaphylaxis c. Less antibodies (IgE binding to mast cells and resulting in their degranulation) on second exposure results in less inflammation causing anaphylaxis d. The innate immune system uses its memory cells to produce more inflammation after the second bee sting resulting in anaphylaxis You are flying a kite in a competition and the length of the string is 725 feet and the angle at which the kite is flying mesures 35 with the ground. How high is your kite flying? Differentiate perimeter controls from internal controls. Give examples. What controls constitute a defense in depth strategy? explain. How are security controls tested and verified? Less popular open source products are not likely to attract the community of users and contributors necessary to help improve these products over time. This situation reiterates the belief that _____ are a key to success. Consider a message signal m(t) with the spectrum shown in the following Figure. The message signal bandwidth W=1KHz, This signal is applied to a product modulator, together with a carrier Accos(2fc t)wave producing the DSB-SC modulated wave S(t). This modulated wave is next applied to a coherent detector. Assuming perfect synchronism between the carrier waves in the modulator and detector, determine the spectrum of the detector output when: (a) The carrier frequency fc=1.25 KHz. And (b) The carrier frequency fc=0.75 KHz. What is the lowest carrier frequency for which each component of the modulated wave S(t) is uniquely determined by m(t)?