Anna is given the equation 3 + 2x = 2x + 3 The replacement set is {2, 3, 4, 5} Anna says the solution is {3}, but the teacher marked her problem incorrect. Explain what the answer should be and why. Why do you think this is?

Answer: k = -1 +/- √769

Step-by-step explanation:

48x - ky = 11

-48x           -48x

         -ky = -48x + 11

         [tex]\frac{-ky}{-k} = \frac{-48x}{-k} + \frac{11}{-k}[/tex]    

           [tex]y =\frac{48x}{k} - \frac{11}{k}[/tex]

Slope: [tex]\frac{48}{k}[/tex]

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 (k + 2)x + 16y = -19

- (k + 2)x             -(k + 2)x

                 16y = -(k + 2)x - 19

                  [tex]\frac{16y}{16} = -\frac{(k + 2)x}{16} - \frac{19}{16}[/tex]

                  [tex]y = -\frac{(k + 2)x}{16} - \frac{19}{16}[/tex]

Slope: [tex]-\frac{(k + 2)}{16}[/tex]

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[tex]\frac{48}{k}[/tex] and [tex]-\frac{(k + 2)}{16}[/tex] are perpendicular so they have opposite signs and are reciprocals of each other.  When multiplied by its reciprocal, their product equals -1.

[tex]-\frac{(k + 2)}{16}[/tex] *  [tex]\frac{k}{48}[/tex] = -1

[tex]\frac{(k + 2)k}{16(48)}[/tex] = 1

Cross multiply, then solve for the variable.

(k + 2)(k) = 16(48)

k² + 2k - 768 = 0

Use quadratic formula to solve:

k = -1 +/- √769

Answer:

You were the 35th caller.

Step-by-step explanation:

For one minute, every 5th caller will win a music player and every 7th caller will win concert tickets.

If you were just the first caller to win both a music player and concert tickets, that means we need to find a least number which is divisible by both 5 and 7.

Actually we will find the LCM(Least common multiple) of 5 and 7.

[tex]5=1*5\\ \\ 7=1*7\\ \\ So, LCM = 1*5*7=35[/tex]

That means, you were the 35th caller.

Answer:

35

Step-by-step explanation:

One inch is greater than centimeter

ANSWER

The subscription price of $45 provides the maximum revenue for the company

EXPLANATION

When the price is $[tex]40[/tex], the company sells [tex]2000[/tex] quantities.

The total revenue accrued

[tex]=40\times2000[/tex]

[tex]=$80,000[/tex]

When the price increases to $[tex]45[/tex] the quantity sold will decrease by 200 magazines which is [tex]2000-200=1800[/tex]

The total revenue accrued

[tex]=45\times 1800[/tex]

[tex]=81000[/tex] dollars

When the price increases to $[tex]50[/tex] the quantity sold will decrease by 200 magazines again which is [tex]1800-200=1600[/tex]

The total revenue accrued

[tex]=50\times 1600[/tex]

[tex]=80000[/tex] dollars

When the price increases to $[tex]55[/tex] the quantity sold will decrease by 200 magazines which is [tex]1600-200=1400[/tex]

The total revenue accrued

[tex]=55\times 1400[/tex]

[tex]=77000[/tex] dollars

Hence a subscription price of $45 provides the maximum revenue for the company.

Answer:

'Kilometers' is the most appropriate unit to measure this distance.

Step-by-step explanation:

The distance between the baseball stadium and the airport is  [tex]1.6\times 10^6[/tex] centimeters.

[tex](1.6\times 10^6)cm = (16\times 10^5)cm[/tex]

Now,  10⁵ centimeters is equal to 1 kilometer.

That means,  [tex](16\times 10^5)cm = (16\times 1)km= 16 km[/tex]

So, 'Kilometers' is the most appropriate unit to measure this distance.

Explanation:

Anna gets paid $8.75/hour working as a barista.

She gets paid $9.00/hour for creating weekly advertisement signs.

In total she works 25 hours a week.

Let 'x' represent the number of hours that she works as a barista, then [tex]25-x[/tex] would represent the number of hours she works to create signs.

A. We need to write a function h(x) that represents the amount of money that Anna earns working as a barista.

Since she is earning $8.75 per hour and she works as a barista for 'x' hours a week so the function is:

[tex]h(x)=8.75\times x=8.75x[/tex]

[tex]h(x)=8.75x[/tex]

B. We need to write a function f(x) to represent the hours Anna works creating the signs.

Since, in total she works for 25 hours a week so the function to represent the number of hours she work to create signs can be given by:

[tex]f(x)=(25-x)[/tex]

C. If 's' represents the number of hours that Anna works creating signs, we need to create a function g(s) that represents her earning creating signs.

So the number of hours Anna works creating signs for the coffee break is [tex]s[/tex], she gets paid $9.00 an hour for creating signs, so:

[tex]g(s)=9\times s=9s[/tex]

[tex]g(s)=9s[/tex]

D. We need to finf a composite function [tex]g(f(x))[/tex], to find the desired function we need to plug value of f(x) in the function g(s):

[tex]g(f(x))=9s=9(f(x))=9(25-x)=225-9x[/tex]

[tex]g(f(x))=225-9x[/tex]

The composite function g(f(x)) represents Anna's earnings while working just to create signs for the Coffee break.

E. To represent Anna's total earnings the functions that can be combined are h(x) and g(f(x)) because h(x) represents Anna's earnings while working as a barista and g(f(x)) represents Anna's earnings while she creates signs for the coffee break.

The function to represent Anna's total earnings can be given as:

[tex]T(x)=h(x)+g(f(x))=8.50x+225-9x[/tex]

where we must keep in mind that 'x' represents the number of hours she spent working as a barista in a 'week'.

One question before I give my answer , Where did it say she stopped?

Answer:

ohhhh cool i go to the same school

Step-by-step explanation:

Answer:

37.5

Step-by-step explanation:

x= time not spent on the internet while on the computer

5/6 = 45/x

45*6/5 = x

This is the equation you should use

Let's rewrite the expression as

[tex] 8x+3ax-5ax = 8-2a \iff 8x - 2ax = 8-2a \iff 2x(4-a) = 2(4-a) [/tex]

So, if [tex] a \neq 4 [/tex], you may divide both sides by [tex] 4-a [/tex], the equation becomes [tex] 2x=2 [/tex], and the only solution is [tex] x=1 [/tex], which means that this is not an identity (an indentity is tautologically true, no matter the value of x).

If instead [tex] a = 4 [/tex], you are multiplying both sides by zero, so the equation becomes

[tex] 2x \cdot 0 = 2 \cdot 0 \iff 0=0 [/tex]

So, it doesn't matter which value for x you choose, because you will always end up with [tex] 0=0 [/tex], which is obviously always true.

x - length of side of a square

A perimeter of a square: P = 4x

We know:

20 ≤ P ≤ 32

20 ≤ 4x ≤ 32       |divide by 4

5 ≤ x ≤ 8

Answer: b. 5 ≤ x ≤ 8

Answer:

ans in b

Step-by-step explanation:

Hi there!

To calculate a discount or a mark-up in the price of a retail item, you need to multiply the given price of the item by the percentage, like so:

1.35 × 0.2 = 0.27

Then you add or subtract as necessary. In your case you would subtract since you are trying to find a discount price.

1.35 - 0.27 = 1.08

So the final price of the product after the discount is $1.08

Your friend, ASIAX

Explanation:

First we consider ΔABC and ΔBCD,

∠C=∠C  (common)

∠B=∠D=[tex]90\textdegree[/tex]

So, ΔABC ≈ ΔBCD (By AA similarity rule )

So by taking corresponding sides in ratios we get

[tex]\frac{AB}{BD}=\frac{AC}{BC}=\frac{BC}{CD}[/tex]      

Now

[tex]AC.CD=BC.BC\\BC^{2} =AC.CD[/tex]              -------- Eqn (1)

Similarly,

We consider ΔABD and ΔABC

∠A=∠A (Commom)

∠B=∠D=[tex]90\textdegree[/tex]

So,

ΔABD ≈ ΔABC (By AA similarity rule )

So by taking corresponding sides in ratios we get

[tex]\frac{BC}{BD}=\frac{AC}{AB}=\frac{AB}{AD}[/tex]  

Now,

[tex]AB.AB=AC.AD\\AB^{2} =AC.AD[/tex]              --------Eqn (2)

By Adding both the equation we get

[tex]AB^2+BC^2=AC.CD+AC.AD\\AB^2+BC^2=AC(CD+AD)\\AB^2+BC^2=AC.AC\\AB^2+BC^2=AC^2[/tex]

Hence, we proved the pythagorean theorem by using similarity of triangle.

Answer:

Domain = {4,-9,5}

Range = {2,4,17}

Step-by-step explanation:

We are given ordered pairs as

{(4,2), (-9,2), (5,4), (4,17)}

This is a subset of cartesian product AXB where

A = {4,-9,5} and B = {2,4,17}

Note: Repeated values are written only once in the set.

Hence we find that 4 is mapped on to 2 and 17,

-9 to 2 and 5 to 4

Domain = I item in the ordered pair of mapping =  {4,-9,5}

Range = II item in the ordered pair of mapping =  {2,4,17}

Hey there!!

What is a coordinate form?

... Coordinate form is written as ( x , y )

What is domain?

... Domain are also called as the 'x' values.

What is the range?

... Range is the other word for the 'y' values.

Given ordered pairs :-

( 4 , 2 ) ; ( -9 , 2 ) ; ( 5 , 4 ) ; ( 4 , 17 )

Hence, the domain is :-

... { 4 , -9 , 5 )

Hence, the range is :-

...  { 2 , 4 , 17 )

Remember :- The values "can not" be repeated!

Hope my answer helps!!

Every 3 Parrots there will be 5 Birds

3/5

Answer:

Every 3 Parrots there will be 5 Birds

3/5

Step-by-step explanation:

There is a certain pattern:

As x is increased by 1/4 every time, y is increased by 3 every time. You can make a proper ratio and set up proportions with these numbers.

2x - 5 = x + 25

-x         -x        

x - 5  =       25

   +5          +5

x       =       30

Answer: x = 30

 1 inch :  3 meters

x 4          x 4        

4 inch :  12 meters

Answer: 12 meters

In this scenario, the combined capacity of the three roads leading to the stadium is 12,000 vehicles per hour. Therefore, to park 10,000 vehicles, it would take approximately 50 minutes.

The question involves an understanding of traffic flow and rates. To find the total capacity of these roads leading to the stadium, we multiply the number of roads by the number of lanes on each road and the capacity of each lane, resulting in 4 lanes per road x 3 roads x 1,000 vehicles per lane per hour, equal to 12,000 vehicles per hour.

With 10,000 vehicles expected for the game, we can then divide the total number of vehicles by the total capacity of the roads per hour to find out how many hours it will take for all vehicles to enter the parking lots. Therefore, it will take approximately 10,000 vehicles / 12,000 vehicles per hour = 0.83 hours, or about 50 minutes.

The increased traffic due to a new manufacturing plant, increased businesses, and route changes in the nearby streets can also affect the traffic flow, however these factors are not quantified in the question. In the real world, proper planning and infrastructure can solve campus parking issues, as the example mentioned about Twelfth and Locust Streets.

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Answer:

If a polygon has not got four right angles then it is not a square.

Step-by-step explanation:

Contrapositive is

if A implies B then not B implies not A.

Answer:

The remaining child got a fraction of  [tex]\frac{1}{10}[/tex].

Step-by-step explanation:

Lets take the fraction of the money fourth child got is [tex]x[/tex]

Addition of all these fractions should be equal to 1.

⇒[tex]\frac{1}{3} +\frac{1}{6} +\frac{2}{5} +x=1[/tex]

⇒[tex]\frac{10+5+12+30x}{30} =1[/tex] (Taking a common denominator)

⇒[tex]\frac{27+30x}{30} =1[/tex]

⇒[tex]27+30x=30[/tex]

⇒[tex]30x=3[/tex]

⇒[tex]x=0.1[/tex]

Therefore,

The remaining child got a fraction of  [tex]\frac{1}{10}[/tex].

By calculating the combined fractions of the inheritance received by the first three children, we've determined that 27/30 of the inheritance has been allocated. Subtracting this from the whole leaves us with 3/30, which simplifies to 1/10 of the inheritance for the remaining child.

The student has asked about how much the remaining child will receive from a father's inheritance if the first received 1/3, the second received 1/6, and the third received 2/5 of the inheritance. To answer this, let's first add up the portions of the inheritance that the first three children received:

First child: 1/3

Second child: 1/6

Third child: 2/5

Now, we will find a common denominator to add these fractions. The least common multiple of 3, 6, and 5 is 30. Let's convert each fraction:

First child: 1/3 = 10/30

Second child: 1/6 = 5/30

Third child: 2/5 = 12/30

Now, add these fractions:

10/30 + 5/30 + 12/30 = 27/30

Once we add up these portions, we get 27/30 which represents the total part of the inheritance that has been given out to the first three children. To find out the portion for the remaining child:

30/30 (the whole inheritance) - 27/30 (the part given away) = 3/30

Reducing the fraction 3/30 gives us 1/10. So, the remaining child would receive 1/10 of the inheritance.

Answer:

138 pipe cleaners can make 23 kit

Step-by-step explanation:

6 pipe cleaners = 1 kit

1 pipe cleaner = 1/6 kit

138 pipe cleaners = 1/6 x 138

138 pipe cleaners = 23

To translate the given sentence into an equation, use the equation 2m = 32 and then divide both sides by 2 to solve for Mabel's age, which is 16 years old.

The sentence '32 is the product of Mabel's age and 2' can be translated into an equation using the variable m to represent Mabel's age. The product of two numbers means you multiply them together. We are given that when you multiply Mabel's age by 2, you get 32. The equation that represents this relationship is:

2m = 32

To find Mabel's age, we simply divide both sides of the equation by 2 to isolate m, which gives us:

m = 32 / 2

m = 16

Mabel's age is 16 years old.

24 dollars.

1/4 + 1/3 = 3/12 + 4/12 = 7/12

7/12 a + 8 = 22

7/12 a = 14

a = 14 x 12/7

a = 24 dollars

An even function is when f(x) = f(-x) ... or ... g(x) = g(-x).

f(x) = - (x + 1)(x - 4)

     = -(x² - 3x - 4)

     = -x² + 3x + 4                  f(x) = -x² + 3x + 4

f(-x) = -(-x)² + 3(-x) + 4

      = -x² - 3x + 4                 f(-x) = -x² - 3x + 4

                            f(x) ≠ f(-x) so it is NOT even.

********************************************************

g(x) = [tex]\frac{3}{2}|x|[/tex]

g(-x) = [tex]\frac{3}{2}|-x|[/tex]

       =  [tex]\frac{3}{2}|x|[/tex]  since absolute value becomes positive

g(x) = g(-x) so it IS even

Answer: C

Answer:

a_n=a_(n−1)+1.4 , where a_1=4.4

Step-by-step explanation:

Given a sequence as

4.4, 5.8, 7.2, 8.6, 10, …

We find that first term is 4.4

II term = 5.8 = 4.4+1.4

III term = 7.2 = 5.8+1.4

Iv term = 8.6 = 7.2+1.4

V term = 10.0 = 8.6+1.4

i.e. each term is got by adding 1.4 to the previous term.

In other words, this is an arithmetic sequence with I term =4.4 and d = common difference =1.4

I term = a_1 = 4.4

and a_2 = a_1+1.4 and so on.

Hence correct answer is

a_n=a_(n−1)+1.4 , where a_1=4.4

Answer:

The value of the equation is [tex]x=\frac{y-a}{b}[/tex].

Step-by-step explanation:

Consider the provided equation.

[tex]y=bx+a[/tex]

We need to solve the provided equation for x.

Subtract a from both side.

[tex]y-a=bx+a-a[/tex]

[tex]y-a=bx[/tex]

Divide both sides by b.

[tex]\frac{y-a}{b}=\frac{bx}{b}[/tex]

[tex]x=\frac{y-a}{b}[/tex]

Hence, the value of the equation is [tex]x=\frac{y-a}{b}[/tex].

The variable 'x' as the subject of the formula of the equation y = bx + a is x = ( y - a )/b.

Given the equation in the question:

y = bx + a

To make the variable 'x' the subject of the formula of the equationy = bx + a, first isolate term with the variable 'x'.

y = bx + a

To isolate the term containing variable 'x', first subtract 'a' from both sides of the equation:

y - a = bx + a - a

y - a = bx

Reaorder:

bx = y - a

Now, divide both sides by 'b':

bx/b = ( y - a )/b

x = ( y - a )/b

Therefore, the variable 'x' equals ( y - a )/b.

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It would be subtraction because 2-1 would result into 1 multiplied by 4 would make 4 your answer. And then 6-3 would equal to 3, multiply 3 by 2, you would get 6. Then finally when you add both 4 and 6, you would get the final answer of 10.

26 is a multiple of 2 but 39 isn't

39 is a multiple of 3 but 26 isn't

Dividng by the next three prime numbers, neither 26 nor 39 is a multiple of 5, 7, or 11

Moving up to the sixth prime number (13), we see that BOTH 26 and 39 are divisible by 13.  26 = 2 * 13 and 39 = 3 * 13 and 13 is the lowest common multiple of 26 and 39.

The answer is b. I see you got it. You are welcome.