1. Which of the following ordered pairs are solutions to the system of equations below?
4x + 4y = -9
Y = 2x - 13
A : (-3, -7)
B : (3-7)
C : (3,7)
D : (-3,7)

Answer:

Mark Me Brainliest !

Answer:

P - 28 = C

Explanation:

P (Regular Price  )

C ( Cost Savings )

You Noticed These Jeans You Liked.

You Couldn't Afford Them So You Waited Til The Price Dropped.

When Prices Drop Its Either 1 of 2 Reasons

Holiday Seasons Or Price Elasticity

So These Jeans Become $28 On The Market.

Simply You Figure Out How Much You'll Save By Comparing The Original Price To The Discounted Price.

There For Your Answer Will Be The Following :

Regular Price - Discounted Price = Cost Savings

Answer:

Step-by-step explanation:

Given the system of equation

x + y - 2z = 9 ... 1

3x + y + 2z = 15 ...2

x - 5y + 22z = -27... 3

First let us reduce the system of equation into two with two unknowns.

Subtracting 1 from 3

y-(-5y) + (-2z-22z) = 9-(-27)

y+5y + (-24z) = 9+27

6y-24z = 36 ... 4

Multiplying equation 1 by 3 and subtracting from equation 2

3x + 3y - 6z = 27

3x + y + 2z = 15

On subtracting both;

(3y-y)+(-6z-2z) = 27-15

2y-8z = 12 ... 5

Equating 4 and 5

6y-24z = 36 ... 4

2y-8z = 12 ... 5

Multiplying equation 5 by 3 the equation becomes;

6y-24z = 36 ... 6

6y-24z = 36 ... 7

We can see that equation 6 and 7 are the same;

let y = k

6k - 24z = 36

k - 4z = 6

4z = k-6

z = k-6/4

Substituting y = k and z = k-6/4 into equation 1 to get x

From 1; x + y - 2z = 9 ... 1

x + k -2( k-6/4) = 9

x + k - (k-6)/2 = 9

x = 9+(k-6)/2-k

x = {18+(k-6)-2k}/2

x = (12-k)/2

The solutions to the system of equations are x = (12-k)/2, y = k, z = (k-6)/4 where k is any constant. This shows that the system of equation has infinite solutions.

Answer:

138,920 m²

Step-by-step explanation:

A square pyramid has 1 square base and 4 lateral triangular faces.

Area of square pyramid is given as BASE Area (BA) + ½*Perimeter of Base (P) × Slant height

Area of pyramid = [tex] b^2 + \frac{1}{2}*4(b)*l [/tex]

Where,

b = base length = 230 m

l = slant height = 187 m (height of the triangular sides)

Surface area = [tex] 230^2 + \frac{1}{2}*4(230)*187 [/tex]

[tex] = 52900 + 2(230)*187 [/tex]

[tex] = 52900 + 86020 [/tex]

[tex] = 138920 [/tex]

Surface area of the pyramid = 138,920 m²

Answer:

hope i helped thank you

Step-by-step explanation:

Answer:

2(6)(4)

Step-by-step explanation:

The commutative law of multiplication states that the order of the numbers does not affect the answer. To rewrite 2(4)(6) using the commutative law of multiplication, rearrange the order of the numbers.

Answer:

C

Step-by-step explanation:

Firstly, we set up the null and alternative hypothesis as follows;

The null hypothesis is;

H0: μ ≥ 12

The alternative hypothesis is;

Ha : μ < 12

Next step is to calculate the test statistic z

Mathematically;

z = (x - μ )/ σ /√n

= (11.58 - 12) /1.93/√(80

Test statistic z = -1.92

Now we proceed to find the probability value that is equal to the value of the test statistic. We can find this by using the standard normal table or NORMSTD function on excel

P(z < -1.92) = 0.0274

P-value = 0.0274

alpha = 0.05

From the above, we can see that

P-value < alpha

And because of this, we are going to reject the null hypothesis and therefore accept the alternative.

We then conclude that there is sufficient evidence to conclude that "The average battery life (between charges) of this model of tablet is at least 12 hours."

Answer:

Hey there!

The slope is rise over run, or 1/-4.

This gives us the slope, which is -1/4.

Hope this helps :)

Answer:

1/4

Step-by-step explanation:

( i mean i think it is - 1/4 but that isn't an answer choice- )

Slope (m) =

ΔY overΔX= -1 over 4  = -0.25

subtract x^1 and x^2 also y^1 and y^2

and put the answer of y' s over the answer of x 's

divide and you got your answer!

Answer:

We conclude that the true average weight loss for the vegan diet exceeds that for the control diet by more than 1 kg.

Step-by-step explanation:

We are given that an article reported on the results of an experiment in which half of the individuals in a group of 66 postmenopausal overweight women were randomly assigned to a particular vegan diet, and the other half received a diet based on National Cholesterol Education Program guidelines.

The sample mean decrease in body weight for those on the vegan diet was 6 kg, and the sample SD was 3.2, whereas, for those on the control diet, the sample mean weight loss and standard deviation were 3.8 and 2.4, respectively.

Let = true average weight loss for the vegan diet.

[tex]\mu_2[/tex] = true average weight loss for the control diet.

So, Null Hypothesis, : 1 kg      {means that the true average weight loss for the vegan diet exceeds that for the control diet by less than or equal to 1 kg}

Alternate Hypothesis, : > 1 kg      {means that the true average weight loss for the vegan diet exceeds that for the control diet by more than 1 kg}

The test statistics that will be used here is Two-sample t-test statistics because we don't know about population standard deviations;

                            T.S.  =  [tex]\frac{(\bar X_1-\barX_2)-(\mu_1-\mu_2)}{s_p \times \sqrt{\frac{1}{n_1}+\frac{1}{n_2} } }[/tex]   ~    [tex]t__n_1_+_n_2_-_2[/tex]

where, = sample mean weight loss for the vegan diet = 6 kg

 = sample mean weight loss for the control diet = 3.8 kg

 = sample standard deviation weight loss for the vegan diet = 3.2 kg

 = sample standard deviation weight loss for the control diet = 2.4 kg

[tex]n_1[/tex]  = sample of vegan diet women = 33

[tex]n_2[/tex] = sample of control diet women = 33

Also, [tex]s_p=\sqrt{\frac{(n_1-1)\times s_1^{2}+(n_2-1)\times s_2^{2} }{n_1+n_2-2} }[/tex]  = [tex]\sqrt{\frac{(33-1)\times 3.2^{2}+(33-1)\times 2.4^{2} }{33+33-2} }[/tex] = 2.83

So, the test statistics =  [tex]\frac{(6-3.8)-(1)}{2.83 \times \sqrt{\frac{1}{33}+\frac{1}{33} } }[/tex]  ~  [tex]t_6_4[/tex]

                                    =  1.722  

The value of t-test statistics is 1.722.

Also, the P-value of the test statistics is given by;

               P-value = P([tex]t_6_4[/tex] > 1.722) = 0.0461 or 4.61%

Since the P-value of our test statistics is less than the level of significance as 0.0461 < 0.05, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region.

Therefore, we conclude that the true average weight loss for the vegan diet exceeds that for the control diet by more than 1 kg.

Answer:

[tex]\large \boxed{\sf \ \text{2 feet, 4 seconds, 258 feet } \ }[/tex]

Step-by-step explanation:

Hello,

To know the height of the baseball when it is hit we have to compute h(0), as t = 0 is when the baseball is hit into the air.

[tex]h(0)=-16\cdot 0^2+128 \cdot 0+2=2[/tex]

So, the answer is 2 feet.

h(x) is a parabola which can be written as [tex]ax^2+bx+c[/tex], it means that the vertex is the point (-b/2a,h(-b/2a)).

The baseball reached its maximum height after

   [tex]\dfrac{-b}{2a}=\dfrac{-128}{-2*16}=\boxed{4 \text{ seconds}}[/tex]

And the maximum height of the baseball is h(4).

[tex]h(0)=-16\cdot 4^2+128 \cdot 4+2=-256+512+2=\boxed{258 \ \text{feet}}[/tex]

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

Answer:

y = negative four-thirds x + StartFraction 31 Over 3 EndFraction

y = 2 x + 7

Step-by-step explanation:

Let x represent the smaller number and y represent the larger number.

Four times a number added to 3 times a larger number is 31.

It is translated as:

Then, solving for y:

    ⇒  y= - 4/3x + 31/3

Correct answer choice for this equation:

y = negative four-thirds x + StartFraction 31 Over 3 EndFraction

Seven subtracted from the larger number is equal to twice the smaller number.

It is translated as:

Then, solving for y:

Correct answer choice for this equation:

y = 2 x + 7

Answer:

It's A.

Step-by-step explanation:

I just got it correct on my unit test review.

Answer:

D

Step-by-step explanation:

100/5=20

20*7=140

Answer:

slope: -3

equation: y = -3x

Step-by-step explanation:

the slope is "the amount of change in the y direction when you take one step to the right".

In the first graph you can see that (0,0) and (1,-3) are on the graph. So when you step from x=0 to x=1, the graph moves 3 units down. Hence the slope is -3. The minus sign means down.

Sometimes it is difficult to see the change in the y direction when only taking 1 step to the right. That's no problem, if you take e.g., 4 steps to the right, you have to divide the y change that you found by 4.

Written in a formula it is dy/dx, a.k.a: the y change divided by the x change.

So that takes care of the slope.

In a general formula for a line y = ax + b, the slope is the letter a.

b is used to move the graph up and down. The first graph moves through (0,0) so no b needed, hence the equation y = -3x.

If b would be, say, 5, the graph would be lifted up by 5. In fact, the point (0,b) will be the point where the graph crosses the y-axis. So you find b by finding the intersection with the y axis. x must be 0 at this point.

With this approach you can solve all assignments easily.

Answer: Choice D

Maximums = (0,1) and (2pi, 1)

minimum = (pi, -3)

======================================================

Explanation:

Cosine is a periodic function that bounces up and down forever. The highest y = cos(x) gets is y = 1 and that happens when x = 0, 2pi, etc. Basically anything in the form x = 2pi*n for any integer n will have y = cos(x) maxed out. Consequently, this means y = 2cos(x)-1 maxes out at the same mentioned x values.

Plug in those x values to find that y = 1 is the max y value for y = 2cos(x)-1

A similar situation happens for the mins as well. We have y = cos(x) be the smallest when x = pi+2pi*n for any integer n.

Answer:

[tex]f(x) = x^3 -sinx +Cx+D[/tex]

Step-by-step explanation:

Given that:

[tex]f ''(x)= 6x +sinx[/tex]

We are given the 2nd derivative of a function f(x) and we need to find f(x) from that.

We will have to integrate it twice to find the value of f(x).

Let us have a look at the basic formula of integration that we will use in the solution:

[tex]1.\ \int {(a\pm b)} \, dx =\int {a} \, dx + \int {b} \, dx \\2.\ \int {x^n} \, dx = \dfrac{x^{n+1}}{n+1}+C\\3.\ \int {sinx} \, dx = -cosx+C\\4.\ \int {cosx} \, dx = sinx+C[/tex]

[tex]\int\ {f''(x)} \, dx =\int\ {(6x +sinx)} \, dx \\\Rightarrow \int\ {6x} \, dx + \int\ {sinx} \, dx \\\\\Rightarrow 6\dfrac{x^2}{2} -cosx +C\\\Rightarrow 3{x^2} -cosx +C\\\Rightarrow f'(x)=3{x^2} -cosx +C\\[/tex]

Now, integrating it again to find f(x):

[tex]f(x) =\int {f'(x)} \, dx =\int{(3{x^2} -cosx +C)} \, dx \\\Rightarrow \int{3{x^2}} \, dx -\int{cosx} \, dx +\int{C} \, dx\\\Rightarrow 3\times \dfrac{x^3}{3} -sinx +Cx+D\\\Rightarrow x^3 -sinx +Cx+D\\\\\therefore f(x) = x^3 -sinx +Cx+D[/tex]

Answer:

x +0y+0z = 400

-x +y+0z = 150

-8x +0y +z = 250

Step-by-step explanation:

The last column is the solution

The rest of the columns are the coefficients of the variables

x +0y+0z = 400

-x +y+0z = 150

-8x +0y +z = 250

Answer:

no 5,3,6,4

Step-by-step explanation:

i got it right

Answer:

first one is no second is 5 third is 3 forth one is 6 and last one is 4

Step-by-step explanation:

PLZ give me brainless.

Answer:

1,-1,3,4

1,6,-2,-4

-4,6,-6,6

Step-by-step explanation:

I believe you just put in the values into the box. Watch the video to see how they did it to make sure it looks like how I did it.

If the drawing is 5 inches tall and the ratio is 1:7, that means that 1 inch will be equal to 7 feet.

Height = 5 x 7 = 35 feet

Answer:

27 degrees

Step-by-step explanation:

Because there is a straight line, all of the angles shown add up to 180, so if you add up all the given angles and subtract it from 180, you will get your answer.

39+86+28=153

180-153=27

Hope this helps. If you have any follow-up questions, feel free to ask.

Have a great day! :)

Answer:

The  90 % confidence  interval  for the mean population is (11.176  ; 20.824 )

Rounding to at least two decimal places would give 11.18 , 20.83

Step-by-step explanation:

Mean = x`= 16 miles per hour

standard deviation =s= 4.1 miles per hour

n= 4

[tex]\frac{s}{\sqrt n}[/tex]  =  4.1/√4= 4.1/2= 2.05

1-α= 0.9

degrees of freedom =n-1=  df= 3

∈ ( estimator  t with 90 % and df= 3 from t - table ) 2.353

Using Students' t - test

x`±∈ * [tex]\frac{s}{\sqrt n}[/tex]

Putting values

16 ± 2.353 * 2.05

= 16 + 4.82365

20.824  ;        11.176

The  90 % confidence  interval  for the mean population is (11.176  ; 20.824 )

Rounding to at least two decimal places would give 11.18 , 20.83

Answer:

[tex]11.18 < \mu <20.82[/tex]

Step-by-step explanation:

From the information given:

A meteorologist who sampled 4 thunderstorms  of  the sample size n = 16

the average speed at which they traveled across a certain state was 16 miles per hour ; i.e Mean [tex]\bar x[/tex] = 16

The standard deviation [tex]\sigma[/tex] of the sample was 4.1 miles per hour

The objective is to find the 90% confidence interval of the mean.

To start with the degree of freedom df = n - 1

degree of freedom df = 4 - 1

degree of freedom df = 3

At 90 % Confidence interval C.I ; the level of significance will be ∝ = 1 - C.I

∝ = 1 - 0.90

∝ = 0.10

∝/2 = 0.10/2

∝/2 = 0.050

From the tables;

Now the t value when ∝/2 = 0.050 is [tex]t_{\alpha / 2 ,df}[/tex]

[tex]t_{0.050 \ ,\ 3} = 2.353[/tex]

The Margin of Error = [tex]t_{\alpha / 2 ,df} \times \dfrac{s}{\sqrt{n}}[/tex]

The Margin of Error = [tex]2.353 \times \dfrac{4.1}{\sqrt{4}}[/tex]

The Margin of Error = [tex]2.353 \times \dfrac{4.1}{2}[/tex]

The Margin of Error = [tex]2.353 \times 2.05[/tex]

The Margin of Error = 4.82365

The Margin of Error = 4.82

Finally; Assume the variable is normally distributed, the  90% confidence interval of the mean is;

[tex]\overline x - M.O.E < \mu < \overline x + M.O.E[/tex]

[tex]16 -4.82 < \mu < 16 + 4.82[/tex]

[tex]11.18 < \mu <20.82[/tex]

Answer:

Yes.

Step-by-step explanation:

1+1=2

3+5=8

7+1=8

9+23=32

5+13=18

An odd number is an even number plus 1, and 1 plus 1 is an even number. even numbers added together are also always even numbers, so two even numbers (in the second example it'd be 2+1 & 4+1, so 2 and 4) plus an even number(1+1=2) must be an even number.

Answer:

2 : 3

Step-by-step explanation:

A disc has a diameter of 21 cm while a mini disc has a diameter of 14cm. Write the ratio of the mini disc diameter to the disc diameter.

Answer: Let the diameter of the mini disc be [tex]d_1[/tex] while the diameter of the disc be [tex]d_2[/tex]. To get the ratio of the mini disc diameter to the disc diameter, we just simply have to divide the diameter of the mini disc by the diameter of the disc and then represent the fraction in ratio form. The ratio of the disc diameters is given by:

Ratio of the mini disc diameter to the disc diameter = Diameter of mini disc / diameter of disc

Ratio of the mini disc diameter to the disc diameter = [tex]\frac{14}{21}=\frac{2}{3}[/tex]

Ratio of the mini disc diameter to the disc diameter = 2 : 3

Answer:

1) Not congruent

2) AAS

3) Not congruent

4) SAS

5) SSS

6) ASA

Step-by-step explanation:

In SSS, ASA, AAS, and SAS, S stands for side and A stands for angle.  If the sides and angles are congruent in any of those patterns, the triangles are congruent.

Hope it helps <3

Answer:

1. Not congruent

2. AAS, Congruent

3. Not congruent

4. SAS, congruent

5. SSS, congruent

6. ASA, Congruent

Step-by-step explanation:

1. Not congruent

It only shows that there are 3 similar angles. There were no sides described.

2. AAS, Congruent

They are congruent, just rotated in an angle (see proof 2)

3. Not congruent

It only shows 2 sides next to each other and an angle next to one side.

4. SAS, congruent

It shows 2 sides that are congruent and congruent angles between them (see proof 4)

5. SSS, congruent

All 3 sides are congruent (see proof 5,6)

6. ASA, Congruent

2 angles and an adjacent side are congruent(see proof 5,6)

Answer:

no tiene mas informaion?

Step-by-step explanation:

Answer:

12

Step-by-step explanation:

We can factor out 10! on the numerator and the denominator,.

This gives: 10! (1 + 11 + (11 * 12)) / 10! (1 + 11)

This is because 10! * 11 is equal to 11! meaning we can factor out 10!.

10! * 11 * 12 also equals 12! which is why we can factor 10! out of that too.

Seeing as 10! is at the top and bottom we can cancel those out.

This leaves us with: 144 / 12 which is equal to 12.

Answer:

Step-by-step explanation:

Hello, because of the end behaviour it means that the leading coefficient is negative so we can construct such polynomial function as below.

[tex]\large \boxed{\sf \bf \ \ -(x+7)(x-6) \ \ }[/tex]

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

The polynomial function will be f ( x ) = - x² - x + 42

What is Quadratic Equation?

A quadratic equation is a second-order polynomial equation in a single variable x , ax²+ bx + c = 0. with a ≠ 0. Because it is a second-order polynomial equation, the fundamental theorem of algebra guarantees that it has at least one solution. The solution may be real or complex.

Given data ,

The polynomial function is of second degree with zeros of -7 and 6

So , x = -7 and x = 6

Let the function be f ( x ) where f ( x ) = ( x + 7 ) ( x - 6 )

Now , as x tends to infinity , the negative makes no such difference on the zeros of the function f ( x ) ,

And , f ( x ) = - ( x + 7 ) ( x - 6 )

Therefore , to find the polynomial function , f ( x ) = - ( x + 7 ) ( x - 6 )

f ( x ) = - [ x² - 6 x + 7 x - 42 ]

        = - [ x² + x - 42 ]

        = - x ² - x + 42

Hence , the polynomial function f ( x ) = - x ² - x + 42

To learn more about polynomial function click :

https://brainly.com/question/25097844

#SPJ2

Answer:

9 x^2

Step-by-step explanation:

( 3x) ^2

We are multiplying 3x * 3x

9 x^2

Answer:

It is unlikely.

Step-by-step explanation:

Certain = 100%

Impossible = 0%

Likely = more than 50%

Unlikely = less than 50%

It is less than 50%, so it is unlikely.

Answer:

(A) it is likely

Step-by-step explanation:

i took the test on edge

Answer:

Step-by-step explanation:

a. A conclusion with regards to the null hypothesis is this:

Since the p value observed which is 0.0433 is less than the alpha level of significant 0.05, we can reject the null hypothesis.

b. A final conclusion that addresses the original claim is this:

Since we rejected the null hypothesis, it means it means there was enough statistical evidence to support the claim that more than 47​% of adults would erase all of their personal information online if they could.

Answer:

To factor this, we need to find two numbers that have a sum of 15 and product of 56; these numbers are 7 and 8. Therefore, the factored form is (x + 7)(x + 8).

Answer:

Step-by-step explanation:

[tex] {x}^{2} + 15x + 56[/tex]

Write 15x as a sum

[tex] {x}^{2} + 8x + 7x + 56[/tex]

Factor out X from the expression

[tex]x(x + 8) + 7x + 56[/tex]

Factor out 7 from the expression

[tex]x(x + 8) + 7(x + 8)[/tex]

Factor out X+8 from the expression

[tex](x + 8)(x + 7)[/tex]

Hope this helps...

Good luck on your assignment..

Answer:

2411.52

Step-by-step explanation:

1/3(3.14*16*16*9) = 2411.52

Answer:

Step-by-step explanation:

Given,

Radius ( r ) = 16

Height ( h ) = 9

pi ( π ) = 3.14

Volume of cone = ?

Now, let's find the volume of cone:

[tex]\pi \: {r}^{2} \frac{h}{3} [/tex]

plug the values

[tex]3.14 \times {16}^{2} \times \frac{9}{3} [/tex]

Evaluate the power

[tex]3.14 \times 256 \times \frac{9}{3} [/tex]

Calculate the product

[tex]2411.52 \: {units}^{2} [/tex]

Hope this helps..

Best regards!!