HELP ME ASAP! Will give BRAINLIEST! Please read the question THEN answer correctly! No guessing. Check ALL that apply.

HELP ME ASAP! Will Give BRAINLIEST! Please Read The Question THEN Answer Correctly! No Guessing. Check

Answers

Answer 1

Answer:

x = -2 or x = 1/3 thus: B & C

Step-by-step explanation:

Solve for x over the real numbers:

2 x^2 + 7 x - 2 = 2 x - x^2

Subtract 2 x - x^2 from both sides:

3 x^2 + 5 x - 2 = 0

The left hand side factors into a product with two terms:

(x + 2) (3 x - 1) = 0

Split into two equations:

x + 2 = 0 or 3 x - 1 = 0

Subtract 2 from both sides:

x = -2 or 3 x - 1 = 0

Add 1 to both sides:

x = -2 or 3 x = 1

Divide both sides by 3:

Answer: x = -2 or x = 1/3


Related Questions

Find the distance between (-10,12) and (-6,-14). Round to the nearest hundredth

Answers

Answer:

26.31 units

Step-by-step explanation:

Given: Points [tex](-10,12),(-6,-14)[/tex]

To find: Distance between the given points

Solution:

Let [tex](x_1,y_1)=(-10,12)\,,\,(x_2,y_2)=(-6,-14)[/tex]

The distance formula is used to find the distance between two points [tex](x_1,y_1),(x_2,y_2)[/tex]

According to distance formula,

Distance = [tex]\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]

[tex]\sqrt{(-6+10)^2+(-14-12)^2}\\ =\sqrt{16+676}\\ =\sqrt{692}\\ =26.31[/tex]

So, distance between the given points is 26.31 units

please help this is timed please!

Answers

Answer:

f/g(x) 1/x x=0

Step-by-step explanation:

f/g 1/x+2

x+2=0

-2      -2

x=-2

Which category is not one of the major responsibilities of state government?
A. Economic development
B. Corrections
C. Electrical power
D. Law enforcement

Answers

Answer: C electricity

Step-by-step explanation:

It is

C. electrical power

What would be the coordinates of the image if this pre-image is reflected across the x-axis?

A(-2, 2), (1, 1), (3, 1), (2, 4)
B(2,-2), (-1, 1), (-3,-1). (-2,-4)
C(-2, 2), (1, -1), (3, 1). (2,4)
D(-2,-2), (-1, 1), (-3, -1) (-2,-4)​

Answers

Answer:  C   (-2, 2), (1, -1), (3, 1). (2,4)

It will help to rotate the image so the x-axis is horizintal and the y-axis is vertical.

Step-by-step explanation:

Imagine the prefigure twirling on a parallel bar like a gymnast.

When it's up-side down the point that was at  (1,1) flips to (1. -1) and the point that was at  (3 -1) flips to (3, 1)

As you chech your choices, that knocks out most of the other possibilities.

But you should still verify the other cocorinates.

Hint: if the reflection is across the x-axis, the x values will be the same in the pre-image and the reflection, the y- values will change accorfing to their distance from the x-axis.

Please help ASAP! I will mark Brainliest! Please READ the question THEN answer CORRECTLY! No guessing!

Answers

Answer: Exact Form:

(Radical 5) over 8

Decimal Form:

0.27950849

0.27950849

Step-by-step explanation:

Answer:

  C.  (√5)/8

Step-by-step explanation:

  [tex]\sqrt{\dfrac{5}{64}}=\dfrac{\sqrt{5}}{\sqrt{64}}=\boxed{\dfrac{\sqrt{5}}{8}}[/tex]

What are the solutions to the equation x-7/x = 6

Answers

Answer:

x = - 1

Step-by-step explanation:

[tex]\frac{x-7}{x}=6\\ \\x-7=6x\\\\-7=6x+x\\\\7x=-7\\\\x=-1[/tex]

Answer:x=-7 Or x=-1

Step-by-step explanation:

x-7/x=6

(x^2-7)/x=6

Collect like terms

x^2-7=6x

Arrange the quadratic equation

x^2-6x-7=0

x^2+x-7x-7=0

x(x+1)-7(x+1)=0

(x-7)(x+1)=0

x-7=0. x+1=0

x=7 x=-1

A University of Florida economist conducted a study of Virginia elementary school lunch menus. During the state-mandated testing period, school lunches averaged 863 calories. The economist claims that after the testing period ends, the average caloric content of Virginia School lunches drops significantly.

Set up the null and alternative hypotheses to test the economist’s claim.

Answers

Answer:

Null hypothesis: u = 863

Alternate hypothesis (H1): u < 863

Step-by-step explanation:

a. Null hypothesis: u = 863

The null hypothesis implies that the average caloric content of Virginia School lunches is equal to 863.

b. Alternate hypothesis: u < 863

The alternate hypothesis implies that the average caloric content of Virginia School lunches is less than 863, that is, it drops significantly.

What is 7/10 divided by 12 simplified

Answers

Answer:

7 /120

Step-by-step explanation:

7/10 ÷ 12

Copy dot flip

7/10 * 1/12

7 /120

Answer:

0.058333

Step-by-step explanation:

esearchers believed that an increase in lean body mass is associated with an increase in maximal oxygen uptake. A scatterplot of the measurements taken from 18 randomly selected college athletes displayed a strong positive linear relationship between the two variables. A significance test for the null hypothesis that the slope of the regression line is 0 versus the alternative that the slope is greater than 0 yielded a p-value of 0.04.

Which statement is an appropriate conclusion for the test?

(A)The p-value of 0.04 indicates that 4% ofthe variation in maximal oxygen uptake for college athletes can be explained by the amount of lean body mass.
(B) The p-value of0.04 indicates that 16% of the variation in maximal oxygen uptake for college athletes can be explained by the amount of lean body mass.
(C)The strong positive linear relationship displayed in the scatterplot along with a p-value less than 0.05 indicates that college athletes with higher lean body mass tend to have higher maximal oxygen uptake.
(D)The strong positive linear relationship displayed in the scatterplot along with a p-value less than 0.05 indicates that an increase in lean body mass causes an increase in maximal oxygen uptake for college athletes.
(E) A p-value less than 0.05 indicates that the relationship displayed in the scatterplot is likely due to chance, and that there is no statistical evidence ofa relationship between lean body mass and maximal oxygen uptake for college athletes.

Answers

Answer:

The correct option is (D).

Step-by-step explanation:

The p-value is well defined as per the probability, [under the null hypothesis (H₀)], of attaining a result equivalent to or more extreme than what was truly observed.

A small p-value (typically ≤ 0.05) specifies solid proof against the null hypothesis (H₀), so you discard H₀.

A large p-value (> 0.05) specifies fragile proof against the H₀, so you fail to discard H₀.

The hypothesis is defined as follows:

H₀: The slope of the regression line is 0, i.e. β = 0.

Hₐ: The slope of the regression line is greater than 0, i.e. β > 0.

A scatter-plot of the measurements taken from 18 randomly selected college athletes displayed a strong positive linear relationship between the two variables; lean body mass and maximal oxygen uptake.

The significance level of the test is, α = 0.05.

The p-value of the test is, p-value = 0.04

As the p-value = 0.04 < α = 0.05, we reject the null hypothesis.

So, it can be concluded that there is a statistical evidence of a relationship between lean body mass and maximal oxygen uptake for college athletes.

Since the scatter-plot shows a strong positive linear relationship, it implies that as the an increase in lean body mass causes an increase in maximal oxygen uptake for college athletes.

Thus, the correct option is (D).

A line with a slope of -7 passes through the points (10,v) (9,4) What is the value of V?

Answers

Answer:

  -3

Step-by-step explanation:

An increase in x-value from 9 to 10 is an increase of 1 unit. The slope of -7 tells you that the corresponding change in y will by -7 units:

  v = 4 -7 = -3

The value of v is -3.

_____

Alternate solutions

You can see this easily on a graph, or you can use the equation of the line. We have a point and a slope, so the point-slope form is useful.

  y = m(x -h) +k

  y = -7(x -9) +4

For x=10, the value of y is ...

  v = -7(10 -9) +4 = -7 +4

  v = -3

What’s the correct answer for this?

Answers

Answer:

B

Step-by-step explanation:

If we dilate point P with point P as center, it would become a line parallel to line m

The correct answer is B

if u dont know dont worry about it

Answers

Answer:

4/15

Step-by-step explanation:

The total number of spins completed is 6+8+7+9 = 30

The letter B came up 8 times

P(B) = number of B's over total

P(B) = 8/30 = 4/15

How to find the area of the seating area

Answers

Parallelogram area is base times height.  Base of 14, height of 10,

Answer: A = (14 ft)(10 ft)    second choice

Answer:

choice B

Step-by-step explanation:

Answer the questions about the cone. V= 1/3 BH

What is the radius of a cone?
3,4,6,8 ft

What is the area of the base of the cone?
6,9,8,16 pi ft squared

What is the volume of the cone?

16,24,48,72 pi ft cubed

Answers

Answers the answer for question one is 3 , for question number two the answer is 9 and the answer for the last question is 24

Step-by-step explanation:

The radius of the cone is 3ft

The base area of the cone is 28.26ft²

The volume of the given cone is 75.36ft³

The formula for calculating the volume of a cone is expressed as:

[tex]V = \frac{1}{3} \pi r^2 h[/tex]

r is the base radius

h is the height of the cone

V is the volume of the cone

From the diagram, the base diameter is 6 ft

Base radius = 6/2 = 3ft

The area of the base of the cone is [tex]\pi r^2 h[/tex]

Base area = [tex]3.14 \times 3^2\ = 28.26ft^2[/tex]

Get the required volume of the cone

Volume = Base area/3

Volume = [tex]\frac{1}{3} \times 28.26 \times 8 = 75.36ft^3[/tex]

Hence the volume of the given cone is 75.36ft³

Learn more here: https://brainly.com/question/24288245

What Value if n makes the equation true
1/2(n + 4)=6

Answers

N=8

1/2 x (8+4) = 6

1/2 x 12 = 6

Hi guys, Can anyone help me with this tripple integral? Thank you:)

Answers

I don't usually do calculus on Brainly and I'm pretty rusty but this looked interesting.

We have to turn K into the limits of integration on our integrals.

Clearly 0 is the lower limit for all three of x, y and z.

Now we have to incorporate

x+y+z ≤ 1

Let's do the outer integral over x.  It can go the full range from 0 to 1 without violating the constraint.  So the upper limit on the outer integral is 1.

Next integral is over y.  y ≤ 1-x-z.   We haven't worried about z yet; we have to conservatively consider it zero here for the full range of y.  So the upper limit on the middle integration is 1-x, the maximum possible value of y given x.

Similarly the inner integral goes from z=0 to z=1-x-y

We've transformed our integral into the more tractable

[tex]\displaystyle \int_0^1 \int_0^{1-x} \int _0^{1-x-y} (x^2-z^2)dz \; dy \; dx[/tex]

For the inner integral we get to treat x like a constant.

[tex]\displaystyle \int _0^{1-x-y} (x^2-z^2)dz = (x^2z - z^3/3)\bigg|_{z=0}^{z= 1-x-y}=x^2(1-x-y) - (1-x-y)^3/3[/tex]

Let's expand that as a polynomial in y for the next integration,

[tex]= y^3/3 +(x-1) y^2 + (2x+1)y -(2x^3+1)/3[/tex]

The middle integration is

[tex]\displaystyle \int_0^{1-x} ( y^3/3 +(x-1) y^2 + (2x+1)y -(2x^3+1)/3)dy[/tex]

[tex]= y^4/12 + (x-1)y^3/3+ (2x+1)y^2/2- (2x^3+1)y/3 \bigg|_{y=0}^{y=1-x} [/tex]

[tex]= (1-x)^4/12 + (x-1)(1-x)^3/3+ (2x+1)(1-x)^2/2- (2x^3+1)(1-x)/3[/tex]

Expanding, that's

[tex]=\frac{1}{12}(5 x^4 + 16 x^3 - 36 x^2 + 16 x - 1)[/tex]

so our outer integral is

[tex]\displaystyle \int_0^1 \frac{1}{12}(5 x^4 + 16 x^3 - 36 x^2 + 16 x - 1) dx[/tex]

That one's easy enough that we can skip some steps; we'll integrate and plug in x=1 at the same time for our answer (the x=0 part doesn't contribute).

[tex]= (5/5 + 16/4 - 36/3 + 16/2 - 1)/12[/tex]

[tex]=0[/tex]

That's a surprise. You might want to check it.

Answer: 0

what is the value of (8 - 4)!?

Answers

Answer:

[tex]=24[/tex]

Step-by-step explanation:

[tex]\left(8-4\right)!\\\mathrm{Subtract\:the\:numbers:}\:8-4=4\\=4!\\\eq \mathrm{Apply\:factorial\:rule}:\quad \:n!=1\cdot 2\cdot 3\cdot \ldots \cdot \:n\\4!=1\cdot \:2\cdot \:3\cdot \:4\\=1\cdot \:2\cdot \:3\cdot \:4\\\mathrm{Multiply\:the\:numbers:}\:1\cdot \:2\cdot \:3\cdot \:4=24\\=24[/tex]

The required value of factorial (8 - 4)! is given as 24.

What is simplification?

The process in mathematics to operate and interpret the function to make the function or expression simple or more understandable is called simplifying and the process is called simplification.

As given in the question,
= (8 - 4)!

Simplifying the above expression,
= 4!
= 4 × 3 × 2 × 1
= 24

Thus, the required value of factorial (8 - 4)! is given as 24.

Learn more about simplification here:

https://brainly.com/question/12501526

#SPJ2

como se escribe en fracción 5÷12​

Answers

Answer:

5/12

Step-by-step explanation:

Answer:

5/12.

Step-by-step explanation:

i have had this before so i already know the answer.

Prob-4 Pressurized air are being used in a manufacturing company in its daily operation. There are three compressors in service; two-screw type compressors, (S1 ,S2) and one-reciprocal type compressor,(R). Each compressor, at any given time, is either off (0), or on (1) . Assume that event A is denoted to reciprocal compressor (R) that is always off . Event B is denoted that at least one of the screw type of compressor is always on. Assume that all outcomes in event B are equally likely. If P(A∩B)=45% and P(A∪B)=93%. Compute the probability that all compressors are off

Answers

Answer:

The probability that all compressors are off = P(A ∩ B') = 0.18

Step-by-step explanation:

Event A is denoted to reciprocal compressor (R) that is always off.

Event B is denoted that at least one of the screw type of compressor is always on.

P(A) = Probability that the reciprocal compressor is off.

P(A') = Probability that the reciprocal compressor is on.

P(B) = Probability that at least one of the screw type of compressor is on.

P(B') = Probability that at least one of the screw type of compressor is off.

P(A ∩ B) = 45% = 0.45

P(A ∪ B) = 93% = 0.93

P(U) = P(A ∪ B) + P(A' ∩ B')

1 = 0.93 + P(A' ∩ B')

P(A' ∩ B') = 1 - 0.93 = 0.07

The probability that all compressors are off is given as P(A ∩ B')

P(A) = P(A n B') + P(A n B)

P(B) = P(A n B) + P(A' n B)

The question asks us to assume that all outcomes in event B are equally likely.

The possible outcomes in event B include

- The two compressors are on

- First compressor is on, second compressor is off

- Second compressor is on, first compressor is off

- both compressors are off

Since all the outcomes are equally likely, the probability that at least one of the two compressors is on = (3/4) = 0.75 = P(B)

P(B) = P(A n B) + P(A' n B)

0.75 = 0.45 + P(A' n B)

P(A' n B) = 0.75 - 0.45 = 0.30

P(A ∪ B) = P(A ∩ B') + P(A' ∩ B) + P(A ∩ B)

0.93 = P(A ∩ B') + 0.30 + 0.45

P(A ∩ B') = 0.93 - 0.30 - 0.45 = 0.18

Hope this Helps!!!

The surface area of a triangular prism is 34 square inches. What is the surface area of a similar prism with dimensions that are 3 times as great as the original prism?

Answers

Answer:

306 square inches

Step-by-step explanation:

The surface are of a triangular prism is given as:

A = ab + 3bh

where a = Length of side

b = base length

h = height of the prism

If the dimensions are 3 times as great, that means a becomes 3a, b becomes 3b and h = 3h

Therefore, the new surface area becomes:

A1 = (3a * 3b) + 3(3b * 3h) = 9ab + 27bh

A1 = 9(ab + 3bh)

=> A1 = 9A

The surface area of the initial prism is 34 square inches, therefore, the surface area of the new prism will be:

A1 = 9 * 34 = 306 square inches

Giving brainliest to CORRECT answer.

Answers

Answer:

B) (-3,4)

Step-by-step explanation:

I graphed the function on the graph below to show you that vertex of the function.

If this answer is correct, please make me Brainliest!

The answer is B because it appears on my graphing calculator as this.

In ΔDEF, d = 410 cm, e = 300 cm and ∠F=126°. Find the length of f, to the nearest centimeter.

Answers

Answer:

635

Step-by-step explanation:

Answer:

634.6 cm

Step-by-step explanation:

f^2 = d^2 + e^2 - 2(d)(e)cos(angle)

f^2 = (410)^2 + (300)^2 - 2(410)(300)cos(126)

f^2 = 402695 and take the square root

Morgan is throwing a pizza party. She has 1 7/8 ​ pounds of cheese available and she needs 1/5 pound of cheese to make each pizza. How many full pizzas can Morgan make with the amount of cheese she has?

Answers

We have been given that Morgan is throwing a pizza party. She has 1 7/8 ​ pounds of cheese available and she needs 1/5 pound of cheese to make each pizza. We are asked to find the number of full pizzas that Morgan can make with the amount of cheese she has.

To solve our given problem, we will divide total amount of cheese by amount of cheese used to make each pizza.

[tex]\text{Number of pizzas}=1\frac{7}{8}\div \frac{1}{5}[/tex]

[tex]\text{Number of pizzas}=\frac{15}{8}\div \frac{1}{5}[/tex]

Now we will convert our division problem into multiplication problem by flipping the 2nd fraction.

[tex]\text{Number of pizzas}=\frac{15}{8}\times \frac{5}{1}[/tex]

[tex]\text{Number of pizzas}=\frac{75}{8}[/tex]

[tex]\text{Number of pizzas}=9\frac{3}{8}[/tex]

We are asked to find the number of full pizzas and we can see that Morgan can make 9 full and [tex]\frac{3}{8}[/tex] pizzas.

Since there are 9 full pizzas, therefore, Morgan can make 9 full pizzas with the amount of cheese she has.

please Please answer this correctly I have to finish this today as soon as possible



Estimate the measure of this angle within 10°.

Answers

Answer:

about 173⁰

Step-by-step explanation:

because it's very close to 180⁰ but isnt it, I'd say between 170 and 180

173 to be safe

which number when rounded to the nearest hundredth is 37.62

Answers

Answer:

Answer: B

Step-by-step explanation:

The number given is 37.62. So, by rounding to the nearest hundredths the number becomes 37.612 and this can be determined by using the rules of rounding off to the nearest hundredths.

Given :

Number - 37.62

The following steps can be used to round off any number to the nearest hundredth:

Step 1 - In the thousandths place value analyze that digit to round off a decimal.

Step 2 - If the value is 5 or more than 5 in the thousandth place then the digit is increased by 1 which is at the hundredth place and in the thousandth place digit and thereafter becomes zero.

Now, the number given is 37.62. So, by rounding to the nearest hundredths the number becomes 37.612.

Therefore, the correct option is B) 37.612.

For more information, refer to the link given below:

https://brainly.com/question/2096984

!!!!!!!!!!!!!!!!HELP

Answers

Answer:

You have to use this equation: [tex]a^{2} + b^{2} -c^{2}[/tex]

Step-by-step explanation:

C is the hypotenuse but you need another one  so you got to do

[tex]x^{2} +8^{2} =17^{2}[/tex]

now you have to find [tex]x^{2}[/tex] which is

[tex]x^{2} = 17^{2} - 8^{2}[/tex]

[tex]x^{2} = 289 - 64[/tex]

[tex]x^{2} = 225[/tex]

[tex]x = \sqrt{255}[/tex]

[tex]x = 15[/tex]

angle relationships with parallel lines

Answers

Answer: 136°

Step-by-step explanation:

In this angle relationship, it is a supplementary angles. because the parallel lines are separated by a line, the 2 angles make 180°.

180°=44°+x°

x=136°

Find the solution to the system of equations.



−2x+2y=−4
3x+3y=−18

Answers

Answer:

Step-by-step explanation:

-6x + 6y = -12

6x + 6y = -36

12y = -48

y = -4

3x - 12 = -18

3x = -6

x = -2

(-2, -4)

Mr. Khan went for a trip in his car, which travels 14.5km/h on 1 liter petrol. The
reading of a speedometer was 19034.0 km when he started his journey and read
19396.5 km after he had completed his journey. How many liters of petrol are
consumed?

Answers

Answer:

25L

Step-by-step explanation:

19396.5 km - 19034.0 km = 362.5‬ km travled

362.5 km / 14.5 km/L = 25L

LOOK AT MY RECENT GIVING 100 POINTS

Answers

Answer:

ok

Step-by-step explanation:

Answer:

As you say

Step-by-step explanation:

Other Questions
Expand. Your answer should be a polynomial in standard form. (x - 7)(x - 3) How many quarters are there in $2? A. 2 B. 4 C. 6 D. 8 PLEASE INCLUDE ALL STEPS! BRAINLIEST GETS 25+ POINTS!!During a canoe trip, Roberto paddled twice as many hours as Edward, and Jim paddled for one hour. If the three of them paddled less than a total of ten hours, what is the number of hours that Roberto could have paddled? Which points could be on the line that is parallel to Line G H and passes through point J? Check all that apply. (3, 5) (1, 5) (3, 2) (3, 2) (5, 1) What two things that Montag decides about the Bible before going to meet Faber? Which of the following statements is consistent with the fact that capital in an economy is subject to diminishing returns? When workers already have a large quantity of capital, giving them an additional unit of capital will not increase productivity. When workers have a relatively small quantity of capital, giving them an additional unit of capital will not increase their productivity. When workers have a relatively large quantity of capital, giving them an additional unit of capital increases their productivity by a large amount. When workers have a relatively small quantity of capital, giving them an additional unit of capital increases their productivity by a relatively large amount. List one property that water and oil do not share. After removing a cutting from a parent plant, farmers usually: 1. Which of the following accurately describes the role of women during the World Wars? (7-6.4)A. Women remained at home and concerned themselves only with cooking and cleaning.B. Women did the majority of the fighting in battleC. Women worked in factories to produce war materials and worked in the medical fieldsD. Women used this opportunity to pursue higher education In which of the following situations would a sound editor use a cross fade?a wedding sequence is being filmed from multiple anglesoa lead character is walking out of a festive party and following a mysterious character into the nighta montage sequence is being cut for a new product commercialO a car chase scene is being filmed with both dolly and mounted camera systems [my] arm muscles smarting and rebelling against this journey" is an example of what*A. MetaphorB. SimileC. Personification Rule of law definition in relation to the federal government How many mL of normal saline is needed to prepare 8 fl oz of 14 strength hydrogen peroxide?a. 90 mLb. 180 mLC 150 mld. 60 mL Question 5(Multiple Choice Worth 5 points)(01.08 LC)What level of diction is typically found in scholarly works and speeches?O FormalO StandardO InformalO Practiced Which relation is a function? A. (1, 0), (3, 0), (1, 1), (3, 1) (1, 3) B. (1, 1), (2, 2), (3, 3), (4, 4), (5, 8) C. (2, 7), (6, 5), (4, 4), (3, 3), (2, 1) D. (9, 3), (9, 3), (4, 2), (4, 2), (0, 0) Which United States city had the largest population in 1790? What is a natural selection?A. A process that happens in the absence of environmental conditions. B. A single process of adaptation within an individual C. The survival of the fittest D. An ability to predict the outcome of a defined species over time. The obligations of citizens to act in ways that support the community are known asA.civic responsibilities.B.employmentC.laws.D.volunteer work. PLSSS HELP ILL GIVE BRAINLIEST AND 10 PTS PER QUESTION AND A BONUS ON CERTAIN QUESTIONS You might need:CalculatorSkill SumAliaa and Zhang Li are tennis-playing robots capable of placing shots with superhuman precisionthagoreAliaa is about to hit its next shot to the far corner of the court. It (Aliaa) knows that the distance betweenitself and Zhang Li is 520 cm, and it knows that the angle between Zhang Li and the far corner is 53Similarly, Zhang Li knows that the angle between Aliaa and the far corner is 100.ythagoreWhat distance should Aliaa hit the ball so that it lands perfectly in the far corner of the court?Do not round during your calculations. Round your final answer to the nearest centimeter.pecialrigcm100% 150AliaaTV53520 cmIntroductie100Zhang LiShow CalculatorDo 5 problems OOOOO