Mathematics College

In the equation x² + 18x + 81 = 0, the roots are?​

Answers

Answer 1
X= -9






Hope this helps<3
Answer 2

Answer:

x = (-9)

Step-by-step explanation:

x^2 + 18x + 81 = 0

x^2 + 9x + 9x + 81 = 0

x(x+9) + 9(x+9) = 0

(x + 9)(x + 9) = 0

(x + 9) = 0

x + 9 = 0

x = 0 - 9

x = -9

Related Questions

Plot the following and their opposites on the number line.

Answers

Step-by-step explanation:

Is there a image or any numbers because I can't see any

Answer:

If you are doing it thru edmentum the answer would be -2, 7, 1, 0, -5, 4, -3

Step-by-step explanation:

Hope this helps!!

The associative property is shown by the following: 5(3+1)=5(3) + 5 (1)

Answers

False, that’s the distributive property

solve pls brainliest

1.
2.

Answers

Answer:

Step-by-step explanation:

Answer:

(-4)³= -64

(-8)²= -64

Step-by-step explanation:

sorry if I did it wrong

PLEASE HELP!!!!!!!!!!! ONLY ANSWER IF CORRECT.

Answers

Answer: x = -2

lemme get me phone rq for the screen shot for the graph

Step-by-step explanation: here's here's graph

Can someone help me with letter b along with an explanation.

Answers

Step-by-step explanation:

Forced vital capacity: the maximum amount of air you can forcibly exhale from your lungs after fully inhaling. It is about 80 percent of total capacity, or 4.8 liters, because some air remains in your lungs after you exhale

9514 1404 393

Answer:

  a) 1.70 L

  b) 16 breaths per minute

Step-by-step explanation:

a) The maximum value of v(t) occurs when the sine function is at its maximum value of 1. In that case, the volume is ...

  1.27 +0.43×1 = 1.70 . . . liters

__

b) One full breath cycle takes a period of time that makes the argument of the sine function be 2π. The that time period is ...

  1.71t = 2π

  t = 2π/1.71 ≈ 3.6744 . . . seconds

Then the number of breaths per minute is ...

  (60 seconds/minute)/(3.6744 seconds/breath) ≈ 16.33 breaths/minute

The person takes about 16 breaths per minute while sleeping.

Ms. Reynold's sprinkler system has 4 stations that water all parts of her front and back lawn. Each station
runs for an equal amount of time. If it takes 36 minutes for the first 3 stations to water, how long does it
take to water all parts of her lawn?
It will take 46
minutes for Ms. Reynold to water her lawn.

Answers

Answer:

It will take 48 minutes to water all parts of her lawn.

Step-by-step explanation:

Each section runs for an equal amount of time

3 sections have run for 36 minutes

36 divided by 3 is 12, meaning each section runs for 12 minutes

12 times 4 is 48

Holly buys a $22 shirt for 20% off. The tax rate in her city is 6.5%. What is the total amount she paid for the shirt? Round to the nearest cent.

Answers

Answer:

$18.74

Step-by-step explanation:

To find the sale price:

22 * 0.2 = 4.4

22 - 4.4 = 17.6

or, you can just multiply by 0.8, so you wont need to subtract later

22 * 0.8 = 17.6

Then, you need to find the tax amount:

17.6 * 6.5 = 1.144

17.6 + 1.144 = 18.744

Round

18.74

Find the S.S. of the equation (x+5)2 =(x+5) in R

Answers

Answer2x +10=x+5

⇒x=5

Step-by-step explanation:

2x-x=10-5

⇒x=5

Given that cos (x) = k
what does cos (2x) = ?

Thanks in advance :)

Answers

Answer:

(2x) = 2k

Step-by-step explanation:

If x = k, then 1x=1k, then 2x=2k

Answer:

2k² - 1

Step-by-step explanation:

cos x =k

cos 2x = 2 cos ² x - 1

           = 2k² - 1

A jewelry store is having a sale, and all items are 15% off. If a necklace was originally price at $85.00, what is the sale price?

Answers

85*.15=12.75
85-12.75
72.25
The sale price is $72.25

Round 0.1347 to the nearest tenth.

Answers

Answer:

0.1

Step-by-step explanation:

Tenths is the first place to the right of the decimal point

Since the next place over is 3

round down to 0.1

Don’t mind answers in boxes

Answers

An expression needs to contain a variable (like “x”) the variable in this case is the total amount of students. For Dance, if we use x to represent the total amount of students, then the statement “1/9 of the students” can be expressed as 1/9x. Then, since it say “29 more than one ninth of the students”, you add 29 to the expression as it’s own term( meaning don’t add 29 with the 1/9, just put them beside each other to form the expression). Doing this should give you the answer: 1/9x + 29

90 men and 60 women were asked if they had watched the latest ‘Expendables’ movie. Altogether 3/5 of the people said Yes.
3/10 of the women said Yes.
What percentage of the men said No? (Show your working)

(THE ANSWER SHOULD BE 20% BUT HOW TO PROVE THAT????)
HELP ME PLEASE

Answers

Explanation:

150 total people
3/5 * 150 = 90 total people said yes

3/10 * 60 = 18 women said yes
(42 women said no)
(72 men said yes)

Subtract the people who said yes from the total people to find the people who said no.
150 - 90 = 60 people said no
60 - 42 = 18 men said no

18/90 = 0.20 or 20%

Please help i will give 100 points

Answers

First:

X = 15

Step-by-step explanation:

So the two angles are congruent, or they are the same angle. So you write the equation as 5x + 9 = 84.

5x + 9 = 84

      -9     -9

5x = 75

(divide) 5 from both sides

x = 15

Second:

X = 27

Step-by-step explanation:

For this one I believe the answer is X = 27 because both equations should equal 180 degrees.

So you write the final equation:

(x + 72) + (3x) = 180

     -72                -72

(combine X's):

4x = 108

Divide both sides by 4

X = 27

Third:

X = 40

Step-by-step explanation:

For this one, the angles match again, so you write it s:

4x - 50 = 2x + 30

    +50           +50

4x = 2x +80

-2x  -2x

2x = 80

Divide both sides by 2

X = 40

End

I super hope this helped!

Maybe brainliest? No pressure!

Let me know if this works or you need more help!

What is an equation of the line that passes through the point (−4,5) and is perpendicular to the line 4x+y=7

Answers

Answer:

[tex]y = \frac{1}{4} x + 6[/tex]

Step-by-step explanation:

rewrite the original equation

[tex]4x + y = 7 \\ y = - 4x + 7[/tex]

perpendicular line has a negative reciprocal slope. I will use this slope and substitute the points to find our y-intercept

[tex]5 = \frac{1}{4} ( - 4) + b \\ 5 = - 1 + b \\ b = 6[/tex]

2 1/7 x 1/3 in lowest terms??

Help please

25 points for the right answer

Answers

Answer:

5/7

Step-by-step explanation:

2 1/7 x 1/3

= 15/7 × 1/3

=  15 × 1/7 × 3

=  15/21

=  15 ÷ 3/21 ÷ 3

=  5/7

Mrs. Miller deposited a check for $245.83 and a check for $418.72. She went to a non-company ATM and withdrew $80. She was charged a fee of $2.50. What is her current balance if she started with $50 in her account?

Play media comment.

Group of answer choices

–$692.05

$632.05

$634.55

$639.55

Answers

Answer: Your answer should be B

Step-by-step explanation: Give brainliest if it works!

SHOW WORK. Algebra question. 100 POINTS. Easy

Answers

Answer:

D. -1 < x < 3

Step-by-step explanation:

The given function is negative between the x - intercepts  -1 and  3.Your choice is correct.

Answer:

D. -1 < x < 3

Step-by-step explanation:

The given function is negative between the x - intercepts  -1 and  3.

Your choice is correct.

8+2x-4=6+2(x+1) please help

Answers

Answer:

Step-by-step explanation:

6.) The candyman spent $100 on his new costume to scare little kids and has $25 left. His
hourly pay is $5. How many hours did he work to afford his new costume, plus the $25?

Answers

Answer:

the answer is 30 or 5

Step-by-step explanation:

tvgnfjh

what is the answer for f+f

Answers

Both f's would be equal to 1 so 2

Answer:

it depends.

Step-by-step explanation:

we have to know what f means to be able to answer this question

Evelyn swimming pool requires 3 quarts of a bacterial cleaning agent five times a month how many gallons of this agent will Evelyn use during June July August?

Answers

Answer:

180 litres

Step-by-step explanation:

Quart: 1.1 litre

3 quarts used every 1 time its cleaned

cleaned 5 times 1 month

5 x 3=15

12 months in a year 15 x 12 = 180

help plshddjjdhdjjdjdjdh

Answers

It’s not c. It’s A. X=3. Pls mark brainliest.

Consider the following 8 numbers, where one labelled
x
is unknown.

5
,


31
,


31
,


x
,


31
,


34
,


10
,


48


Given that the range of the numbers is 67, work out 2 values of
x
.

Answers

9514 1404 393

Answer:

  x = -19 or 72

Step-by-step explanation:

The range of the given numbers is 5 to 48. In order for x to make the range be 67, the value of x must be 67 less than 48, or must be 67 greater than 5.

  x is 48 -67 = -19

or

  x is 5 +67 = 72

help help hep me sorry for like a million queestions

Answers

Answer:

1/12. Larger the disparity between numerator and the denominator (with the denominator the larger), the smaller the fraction!

Which is the graph of f(x) = 5(2)*?
O
40
20
(2, 20)
(0.5)
4 -3 -2 -1
1 2
3
4
5 6 x

Answers

Answer:

the graph is this one , I send the picture

what's the missing sequence of 37 40 123 ? 372 1116
​

Answers

Answer:

369

Step-by-step explanation:

37 + 3 = 40

40 × 3 = 120

120 + 3 = 123

123 × 3 = 369

and so on

The missing term of the given sequence is 369.

What is sequence?

A specific is an ordered list of elements with a specific pattern.

According to the given question

We have a sequence

37, 40, 123

The first term of the above sequence = 37

The second term of the sequence = 37 + 3 = 40

The third term of the given sequence = 40 × 3 = 120

The fourth term of the sequence = 120 + 3 = 123

The fifth term of the sequence = 123 × 3  = 369

The sixth term of the sequence  = 369 + 3 = 372

Hence, the missing term of the given sequence is 369.

Learn more about the sequence here:

https://brainly.com/question/19819125

#SPJ2

HELP ME SOLVEEEE !!!!!

Answers

Answer:

y=2

Step-by-step explanation:

y+7=9(y-1)

y+7=9y-9

y-9y=-9-7

-8y=-16

y=2

>> Answer

_________

[tex] \: [/tex]

[tex] \frac{1}{3} (y + 7) = 3(y - 1)[/tex]

[tex] \frac{y + 7}3 = 3(y - 1) [/tex]

[tex]y + 7 = 9(y - 1)[/tex]

[tex]y + 7 = 9y - 9[/tex]

[tex]y - 9y = - 9 - 7[/tex]

[tex] - 8y = - 16[/tex]

y = 2✔

Find the equation of the linear function represented by the table y 6 9 12 15 x 1 2 3 4​

Answers

Answer: y = 3x + 3

Step-by-step explanation:

We know the linear function as following:

y = mx + b

m is the slope of the equation. b represents the y-intercept.

To find m, we divide the rate of change of y by the rate of change of x. We know that the rate of change y is +3 because we add three each time in order to find the next value. The rate of change of x is +1 because we add one each time to find the next value. So m would be:

m = 3/1

m = 3

Our linear equation is now as following:

y = 3x + b

In order to find b, we should first substitute a coordinate in the equation above.

y = 3x + b

6 = 3(1) + b

Then, we multiply 3 with 1

6 = 3 + b

Finally, we substract 3 on both sides. Now we've got our b value.

b = 3

Now our equation should look like this.

y = 3x + 3

To verify if the equation, we should substitute another coordinate, and verify if each side of the equation is equal.

y = 3x + 3

15 = 3(4) + 3

15 = 12 + 3

15 = 15

So we now know that the equation is indeed correct.

Answer:

y = 3x + 3

Step-by-step explanation:

As per given table we have ordered pairs:

(1, 6), (2, 9), (3, 12), (4, 15)

Find the slope and y- intercept to work out the equation.

y = mx + b

The slope:

m = (9 - 6)/(2 - 1) = 3/1 = 3

The y -intercept:

6 = 3*1 + b6 = 3 + bb = 3

The equation is:

y = 3x + 3

The graph is attached

c. The number of men in a community is 2,400. If the ratio of women to men in the community is 5:4,
find
i. The total number of people in the community.
ii. The number of women in the community.
iii. How many more women are there than men if 400 men joined the community.

Answers

Answer:

women : men

5. : 4

x. : 2400

x = 3000

i) 3000 + 2400= 5400

ii) 3000

iii) 3000 - ( 2400+400) = 200

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