Can someone answer this question?

The cost per gallon of regular gasoline will be $2.69 per gallon.

The rate is the ratio of the amount of something to the unit. For example - If the speed of the car is 20 km/h it means the car travels 20 km in one hour.

MOBIL Service station sells various types of fuel: standard, besides, and premium. Mr.Adams burned through $36.25 on 12.5 gallons of standard fuel at the MOBIL Service station.

The cost per gallon for regular gasoline will be given as,

Rate = $36.25 / 12.5

Rate = $2.69 per gallon

The cost per gallon of regular gasoline will be $2.69 per gallon.

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Answer:

Below.

Step-by-step explanation:

If g(x) is the inverse of g(x) then  g(f(x)) = x.

g(f(x)) =  4 (x + 9)/ 4 - 9

= x + 9 - 9

= x.

So it is the inverse.

Also if you find f((g(x)) it is also = to x.

Answer:

12,000

Step-by-step explanation:

espero que he ayudado

Answer:

Around 100,i.e. 105

Step-by-step explanation:

In the given cube

Length of the cube = 7 unit cells

Breadth of the cube = 3 unit cells

Height of the cube = 5 unit cells

Therefore the number of unit cubes required to make such big cube is nothing but the volume of the big cube = length*breadth*height

⇒Number of cubes used to make that big cube= 7*5*3

                                                                               = 105

Hence, option D (around 100) is the correct answer

Answer and explanation:

Given : Suppose you and a friend each choose at random an integer between 1 and 8, inclusive.

The sample space is

(1,1) (1,2) (1,3) (1,4) (1,5) (1,6)  (1,7) (1,8)

(2,1) (2,2) (2,3) (2,4) (2,5) (2,6)   (2,7) (2,8)

(3,1) (3,2) (3,3) (3,4) (3,5) (3,6)   (3,7) (3,8)

(4,1) (4,2) (4,3) (4,4) (4,5) (4,6)   (4,7) (4,8)

(5,1) (5,2) (5,3) (5,4) (5,5) (5,6)   (5,7) (5,8)

(6,1) (6,2) (6,3) (6,4) (6,5) (6,6)   (6,7) (6,8)

(7,1) (7,2) (7,3) (7,4) (7,5) (7,6)   (7,7) (7,8)

(8,1) (8,2) (8,3) (8,4) (8,5) (8,6)   (8,7) (8,8)

Total number of outcome = 64

To find : The following probabilities ?

Solution :

The probability is given by,

[tex]\text{Probability}=\frac{\text{Favorable outcome }}{\text{Total outcome}}[/tex]

a) p(you pick 5 and your friend picks 8)

The favorable outcome is (5,8)= 1

[tex]\text{Probability}=\frac{1}{64}[/tex]

b) p(sum of the two numbers picked is < 4)

The favorable outcome is (1,1), (1,2), (2,1)= 3

[tex]\text{Probability}=\frac{3}{64}[/tex]

c) p(both numbers match)

The favorable outcome is (1,1), (2,2), (3,3), (4,4), (5,5), (6,6), (7,7), (8,8) = 8

[tex]\text{Probability}=\frac{8}{64}[/tex]

[tex]\text{Probability}=\frac{1}{8}[/tex]

The probabilities for choosing specific integers or pairs with a particular sum between 1 and 8 are computed based on the total number of possible combinations, which is 64 (8x8).

The probability of choosing a specific pair of integers when you and a friend each pick an integer at random between 1 and 8 can be found using the principles of probability. With 8 choices for each person, there are 64 (8 × 8) possible combinations.

To compute the probability that the sum of the two numbers picked is < 4, notice that there are very few combinations: (1,1), (1,2), (2,1). So, P(sum < 4) is 3/64.

Answer:

Step Three is the error

Step-by-step explanation:

right on edge

The student made the first mistake in step 2. Use the change of base formula to rewrite the equations is incorrect.

The reason is that the change of base formula is typically used in logarithms, not when graphing systems of equations.

When solving a system of linear equations by graphing, you would typically write the equations in the form y=mx+b and then graph them on the coordinate plane to find the point of intersection.

The change of base formula is used to convert logarithms from one base to another, not to rewrite equations in general.

In this case, the student simply rewrote the equations using different notation without changing their meaning.

The correct method would be to graph the original equations and identify the x-value at the point of intersection.

Answer:

C

Step-by-step explanation:

Discrete data includes numbers that are exclusively integers, i.e, ... -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 7 ..... and so on. It do not include the other real numbers that are not integers. You can recognize discrete data, for example, in a grah, as there will be only isolated points and not a continuous line.

The height of a member is continuous as we can have every number between 0 and the top height. There can be 1.50 m, 1.51m, 1.5000001m, 1.65m, 1,644444449, and so on with every number (obviously, we will not have heights of 5.78 m because of simply nature). So, we discard option a.

Exactly the same as heights happens with weight. We can ahve any weight you may imagine from the less weight to the top. 100.45555555 pounds is a posible weight, for example. With this, we discard option b.

The time is also continuous. Lets think in minutes. A runner can register 7 minutes, 7.2 minutes, 7.098686 minutes, and so on for every number. We can use every fraction you imagine. So we can discard options d and e.

However the number of times is discrete, because the number of races are discrete. There are 1, 2, 3, 4,... races. We can not have 5.5 races, it is impossible. So, the number of times a runner finished ahead is discrete. There is no member that finished 7.2 times first, we can find either 7 times or 8 times, but not 7.2. So, option c is the correct.

Answer: There were 40 adult tickets and 28 children's tickets

Step-by-step explanation:

Let x represent the number of adult tickets sold.

Let y represent the number of children's tickets sold.

An event sold $608 worth of tickets adult tickets cost $11 while children's tickets cost $6. It means that

11x + 6y = 608 - - - - - - 1

If 68 tickets were sold, it means that

x + y = 68

Substituting x = 68 - y into equation 1, it becomes

11(68 - y) + 6y = 608

748 - 11y + 6y = 608

- 11y + 6y = 608 - 748

- 5y = 140

y = 140/5 = 28

x = 68 - y = 68 - 28

x = 40

The number of toddlers at this daycare center is C. 42.

A ratio is a comparison between two similar quantities in simplest form.

Proportions are of two types one is the direct proportion in which if one quantity is increased by a constant k the other quantity will also be increased by the same constant k and vice versa.

In the case of inverse proportion if one quantity is increased by a constant k the quantity will decrease by the same constant k and vice versa.

Given, The ratio of toddlers to infants at a daycare center is 7 to 3.

let, There be 'T' number of toddlers and 'I' number of infants.

So, T : I = 7 : 3.

T/I = 7/3.

3T = 7I Or I = 3T/7...(i)

Now, Twelve more infants join the daycare to change the ratio to 7 to 5.

Therefore,

T/(I + 12) = 7/5.

5T = 7I + 84..(ii)

5T = 7(3T/7) + 84.

5T = 3T + 84.

2T = 84.

T = 42.

So, The number of toddlers in this day center is 42.

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Answer:

1,152

Step-by-step explanation:

The rectangular field have four sides, where the opposite sides of the field are equal

The length of the brick wall that gives the lowest total cost of the fence is 40 meters

Let the length of the rectangular field be x, and the width be y.

Where: y represents the side to be made of brick wall,

So, the perimeter of the field is calculated using:

[tex]\mathbf{P =2x + 2y}[/tex]

And the area is

[tex]\mathbf{A =xy}[/tex]

The area is given as 2400.

So, we have:

[tex]\mathbf{xy = 2400}[/tex]

Make x the subject in

[tex]\mathbf{x = \frac{2400}y}[/tex]

Rewrite the perimeter as:

[tex]\mathbf{P =2x + y + y}[/tex]

The brick wall is $10 per meter, while the wooden wall is $20 per 4 meters

So, the cost function becomes

[tex]\mathbf{C =\frac {20}4 \times (2x + y) + 10 \times y}[/tex]

[tex]\mathbf{C =5 \times (2x + y) + 10 \times y}[/tex]

Open brackets

[tex]\mathbf{C =10x + 5y + 10y}[/tex]

[tex]\mathbf{C =10x +15y}[/tex]

Substitute [tex]\mathbf{x = \frac{2400}y}[/tex] in the cost function

[tex]\mathbf{C =10 \times \frac{2400}{y} +15y}[/tex]

[tex]\mathbf{C = \frac{24000}{y} +15y}[/tex]

Differentiate

[tex]\mathbf{C' = -\frac{24000}{y^2} +15}[/tex]

Set to 0, to minimize

[tex]\mathbf{-\frac{24000}{y^2} +15 = 0}[/tex]

Rewrite as

[tex]\mathbf{\frac{24000}{y^2} =15}[/tex]

Divide through by 15

[tex]\mathbf{\frac{1600}{y^2} =1}[/tex]

Multiply both sides by y^2

[tex]\mathbf{y^2 =1600}[/tex]

Take square roots of both sides

[tex]\mathbf{y^2 =40}[/tex]

Hence, the length of the brick wall should be 40 meters

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Answer:

  Raj can look on his pay stub to find the total is $400

Step-by-step explanation:

The relation between the deposit and the total pay is ...

  deposit = 0.40 × total pay

  total pay = deposit / 0.40 = 160/0.40 = 400

Raj was paid $400 this week.

Final answer:

The volume of the cylindrical water tank is approximately 490 ft³.

Explanation:

To find the volume of a cylindrical water tank, we can use the formula V = πr²h, where r is the radius of the tank and h is the height of the tank. Plugging in the given values, we have V = 3.14 × (5.5 ft)² × 13 ft. Simplifying, we get V ≈ 490 ft³. Rounding to the nearest whole number, the volume of the tank is approximately 490 ft³.

Answer: Andre picked 252 pounds of apples

Step-by-step explanation:

Let x = number of pounds of apple picked by Jane.

Let y = number of pounds of apple picked by Andre

Let z = number of pounds of apple picked by Maria

Andre picks three times as many pounds as maria. It means that

y = 3z

Jane picks two times as many pounds as Andre. It means that

x = 2y

The total weight of the apples is 840 pounds. It means that

x + y + z = 840 - - - - - - - - - 1

We will substitute z = y/3 and x = 2y into equation 1

2y + y + y/3 = 840

Cross multiplying with 3

6y + 3y + y = 2520

10y = 2520

y = 2520/10 = 252

x = 2y = 252× 2 = 504

z = y/3 = 252/3 = 84

Answer:

  39 cups

Step-by-step explanation:

If we assume that the 3.5 cups of concentrate make 3.5+3 = 6.5 cups of tea, we can use the proportion ...

  6.5/3.5 = x/21

to find the x cups of tea Ahab can make with 21 cups of concentrate.

Multiplying by 21, we get ...

  x = 21(6.5/3.5) = 39

Ahab can make 39 cups of tea.

Answer:

pic # 1 answer is B. 81 x pi

pic#3 answer is C. QC

Step-by-step explanation:

pic #1

         the formula to find the area of a circle is pi x the radius to the second power

they give you the diameter. (18)

the radius is half of a diameter (d/2)

so 18/3 = 9

9 to the second power (9 x 9) = 81

so your answer is 81 x pi

pic#2

        I don't much, but i do know they asking for the radius and since the radius is half the diameter of a circle then QC makes sense in my book.

hope this is helpful.

The area of the circle is B. 81 π in²

the line segment representing radii are PC and QC

Area of circle is given by the formula

= π d² / 4

where d = 18 in

= π * 18² / 4

= 81 π in²

When C is the center of the circle. The line segment representing radii are lines from the circumference to the center. These lines includes

PC and QC

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Answer:

Remember, a number a is a zero of the polynomial p(x) if p(a)=0. And a has multiplicity n if the factor (x-a) appear n times in the factorization of p(x).

1. Since -2 is a zero with multiplicity 1, then (x+2) is a factor of the polynomial.

2. Since 1 is a zero with multiplicity 2, then (x-1) is a factor of the polynomial and appear 2 times.

3. Since 5 is a zero with multiplicity 3, then (x-5) is a factor of the polynomial and appear 3 times.

Then, the polynomial function with the zeros described above is

[tex]p(x)=(x+2)(x-1)^2(x-5)^3= x^6-15x^5+72x^4-78x^3-255x^2+525x-250[/tex]

Final answer:

The polynomial function with the given zeros -2, 1, and 5, with their respective multiplicities 1, 2, and 3, and leading coefficient 1 is [tex]f(x) = (x + 2)(x - 1)^2(x - 5)^3.[/tex]

Explanation:

To form a polynomial function f(x) with the given zeros and multiplicities, we use the fact that a zero x = a with multiplicity m corresponds to a factor (x - a)^m in the polynomial. Since the leading coefficient should be 1, we simply multiply these factors together. Based on this, the polynomial with zeros -2 (multiplicity 1), 1 (multiplicity 2), and 5 (multiplicity 3) is:

[tex]f(x) = (x + 2)(x - 1)^2(x - 5)^3[/tex]

This polynomial is of degree 6, as the sum of the multiplicities of the zeros (1+2+3) equals the degree.

Answer:

  (B)  9/20

Step-by-step explanation:

The fastest machine can do 1/4 of the job in 1 hour. The second-fastest machine can do 1/5 of the job in 1 hour. Together, these two machines can do ...

  (1/4) +(1/5) = (5+4)/(5·4) = 9/20

of the job in 1 hour.

9/20 of the job can be done in 1 hour by two of the machines.

Answer: 240 people get the news from social media

Step-by-step explanation:

The ratio of the number of people who get their news from social media to the number of people who their news elsewhere is 3:7

Total ratio is the sum of the proportion of those that get their news from social media and those that got their news elsewhere.

It becomes 3+7 = 10

Total number of people in the town is 800

To determine the number of people that got their news from social media, we will divide the proportion of those that get their news from social media by the total ratio and multiply by the total number of people in the town. It becomes

3/10 × 800 = 240

The probability of guessing correctly within ten tries is 10/1,000,000, simplifying to 1/100,000.

This problem is related to probability. The total number of ways to form a six-digit code with numbers from 0 to 9, where numbers can be repeated, is 10^6 because there are 10 possible choices for each of the 6 places. Thus there are 1,000,000 possible codes.

The probability of you correctly guessing the code on any one try would then be 1/1,000,000. If you try ten times, each attempt independent of the others, you still have a 1/1,000,000 chance each try. Combining these ten independent events, the total probability of guessing the correct code in ten tries would be 10/1,000,000.

Therefore, your probability is 10/1,000,000, which simplifies to 1/100,000.

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Answer:

a) [tex]P(\bar X>81.5)=1-0.933=0.067[/tex]

b) [tex]P(\bar X<69.5)=0.0062[/tex]

c) [tex]P(73.4<\bar X<84.05)=0.8755[/tex]  

Step-by-step explanation:

1) Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Let X the random variable that represent interest on this case, and for this case we know the distribution for X is given by:

[tex]X \sim N(\mu=77,\sigma=27)[/tex]  

And let [tex]\bar X[/tex] represent the sample mean, the distribution for the sample mean is given by:

[tex]\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})[/tex]

On this case  [tex]\bar X \sim N(77,\frac{27}{\sqrt{81}})[/tex]

Part a

We want this probability:

[tex]P(\bar X>81.5)=1-P(\bar X<81.5)[/tex]

The best way to solve this problem is using the normal standard distribution and the z score given by:

[tex]z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}[/tex]

If we apply this formula to our probability we got this:

[tex]P(\bar X >81.5)=1-P(Z<\frac{81.5-77}{\frac{27}{\sqrt{81}}})=1-P(Z<1.5)[/tex]

[tex]P(\bar X>81.5)=1-0.933=0.067[/tex]

Part b

We want this probability:

[tex]P(\bar X\leq 69.5)[/tex]

If we apply the formula for the z score to our probability we got this:

[tex]P(\bar X \leq 69.5)=P(Z\leq \frac{69.5-77}{\frac{27}{\sqrt{81}}})=P(Z<-2.5)[/tex]

[tex]P(\bar X\leq 69.5)=0.0062[/tex]

Part c

We are interested on this probability

[tex]P(73.4<\bar X<84.05)[/tex]  

If we apply the Z score formula to our probability we got this:

[tex]P(73.4<\bar X<84.05)=P(\frac{73.4-\mu}{\frac{\sigma}{\sqrt{n}}}<\frac{X-\mu}{\frac{\sigma}{\sqrt{n}}}<\frac{84.05-\mu}{\frac{\sigma}{\sqrt{n}}})[/tex]

[tex]=P(\frac{73.4-77}{\frac{27}{\sqrt{81}}}<Z<\frac{84.05-77}{\frac{27}{\sqrt{81}}})=P(-1.2<z<2.35)[/tex]

And we can find this probability on this way:

[tex]P(-1.2<z<2.35)=P(z<2.35)-P(z<-1.2)[/tex]

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

[tex]P(-1.2<z<2.35)=P(z<2.35)-P(z<-1.2)=0.9906-0.1151=0.8755[/tex]

Answer: 28989675

Step-by-step explanation:

The number of ways to choose r things out of n things ( if order doesn't matter) is given by :_

[tex]^nC_r=\dfrac{n!}{r!(n-r)!}[/tex]

Given : In the 6/55 lottery game, a player picks six numbers from 1 to 55.

Then , the number of ways to choose 6 numbers out of 55 is  if repetition is not allowed :

[tex]^{55}C_6=\dfrac{55!}{6!(55-6)!}\\\\=\dfrac{55\times54\times53\times52\times51\times49!}{6\times5\times4\times3\times2\times1\times49!}\\\\=\dfrac{55\times54\times53\times52\times51}{6\times5\times4\times3\times2\times1}\\\\=28989675[/tex]

Hence, the player have 28989675 choices.

When repetition is not allowed, a player in the 6/55 lottery game can make 32,468,436 different choices.

When repetition is not allowed, the number of different choices a player has in the 6/55 lottery game can be determined using the concept of combinations. A combination is a selection where the order of the elements does not matter.

To calculate the number of combinations, we can use the formula:

C(n, r) = n! / (r! * (n-r)!)

In this case, n = 55 (total number of choices) and r = 6 (number of choices to be made). Substituting these values into the formula:

C(55, 6) = 55! / (6! * (55-6)!)

Simplifying further:

C(55, 6) = 55 * 54 * 53 * 52 * 51 * 50 / (6 * 5 * 4 * 3 * 2 * 1)

This simplifies to:

C(55, 6) = 32,468,436

Therefore, a player has 32,468,436 different choices in the 6/55 lottery game when repetition is not allowed.

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Answer:

We conclude that cheddar popcorn weighed less than 5.5 ounces.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ =5.5 ounces

Sample mean, [tex]\bar{x}[/tex] = 5.23 ounces

Sample size, n = 64

Alpha, α = 0.05

Sample standard deviation, σ = 0.24 ounce.

First, we design the null and the alternate hypothesis

[tex]H_{0}: \mu = 5.5\text{ ounces}\\H_A: \mu < 5.5\text{ ounces}[/tex]

We use One-tailed z test to perform this hypothesis.

Formula:

[tex]z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }[/tex]

Putting all the values, we have

[tex]z_{stat} = \displaystyle\frac{5.23 - 5.5}{\frac{0.24}{\sqrt{64}} } = -9[/tex]

Now, [tex]z_{critical} \text{ at 0.05 level of significance } =-1.645[/tex]

Since,  

[tex]z_{stat} < z_{critical}[/tex]

We reject the null hypothesis and accept the alternate hypothesis. Thus, we conclude that cheddar popcorn weighed less than 5.5 ounces.

The z test is mathematically given as z=-1.86, and a>p value.

therefore we failed to accept null hypothesis.

Question Parameters:

A random sample of 64 bags

weighed, on average, 5.23 ounces

the standard deviation of 0.24 ounce.

µ = 5.5 ounces

Generally, hypothesis  is mathematically given as

H_0:\mu = 5.8 null

H_a:\mu < 5.8 alter

Using z test

[tex]z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}\\\\z=\frac{5.74-5.8}{\frac{0.26}{\sqrt{65}}}[/tex]

z=-1.86

In conclusion,

p value = 0.0314

α = 0.10

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Answer:

The number of games sold by Chris  = [tex](\frac{g}{8}  - 17)[/tex]

Step-by-step explanation:

The total number of employees in the team = 8

The total number of games sold by the whole team = g

The number of games sold by Chris = Average Games sold by each member - 17

Now, [tex]\textrm{Average number of games sold by each}  = \frac{\textrm{Total number of games sold by team}}{\textrm{Total number of people in team}}\\[/tex]

=[tex]\frac{g}{8}[/tex]

⇒The average number of games sold by each of the team member = g/8

Hence, the number of games sold by Chris  = [tex](\frac{g}{8}  - 17)[/tex]

Answer:

16+h=c

Step-by-step explanation:

Check the picture below.

Final answer:

Sally looked at 48 turkey trees and found 7/8 were too small. By multiplying 48 by the fraction 7/8, we find that 42 trees were too small.

Explanation:

The question asks us to calculate the number of turkey trees that were too small, based on the total number of trees Sally looked at and the fraction that were too small.

Sally looked at 48 trees in total and found that 7/8 of them were too small. To find the number of too small trees, we multiply the total number of trees by the fraction that were too small:

Number of too small trees = Total number of trees × Fraction too small

Number of too small trees = 48 × 7/8

Calculating this gives us:

Number of too small trees = 48 × 0.875

Number of too small trees = 42

Therefore, out of the 48 turkey trees Sally looked at, 42 of them were too small for her Thanksgiving needs.

Answer:

The answer to your question is  y = x - 23

Step-by-step explanation:

Process

1.- Get the slope of the line

If two lines are parallels, it means that they have the same slope.

                                 y = 1x - 10

Slope = m = 1

2.- Get the equation of the line

                               y - y1 = m(x - x1)

                               y + 29 = 1(x + 6)                 Substitution

                               y + 29 = x + 6                     Expanding

                               y = x + 6 - 29                      Simplifying

                               y = x - 23

Answer:

y = x - 23

Step-by-step explanation:

All lines parallel to the given line y = x - 10 have the same slope (1), and the same form of equaiton:  y = x + C, where C is a constant.

We know that the new line passes through (-6, -29).  Replacing x with -6, y with -29, we get:

-29 = -6 + C, and thus we find that C = -23.

Thus, the desired equation is

y = x - 23

Answer:

13

Step-by-step explanation:

5-(-8)=13

Answer:

13

Step-by-step explanation:

The number line is really helpful in this case. All you have to do is count the spaces between -8, where A is, and 5, where C is. There's 13 spaces between them, therefore the length of AC is 13.

Answer:

The smallest poster has dimension 25.6 cm by 32.05 cm.

Step-by-step explanation:

Let "x" and "y" be the length and the width of the poster.

The margin of a poster are 4 cm and the side margins are 5 cm.

The length of the print = x - 2(4) = x - 8

The width of the print = y - 2(5) = y - 10

The area of the print = (x- 8)(y -10)

The area of the print is given as 388 square inches.

(x-8)(y -10) = 388

From this let's find y.

y -10 = [tex]\frac{388}{(x - 8)}[/tex]

y = [tex]\frac{388}{x - 8} + 10[/tex] -------------------(1)

The area of the poster = xy

Now replace y by [tex]\frac{388}{x - 8} + 10[/tex], we get

The area of the poster = x ([tex]\frac{388}{x - 8} + 10[/tex])

= [tex]10x + \frac{388x}{x - 8}[/tex]

To minimizing the area of the poster, take the derivative.

A'(x) =  [tex]10 + 388(\frac{-8}{(x-8)^{2} } )[/tex]

A'(x) = [tex]10 - \frac{3104}{(x-8)^2}[/tex]

Now set the derivative equal to zero and find the critical point.

A'(x) = 0

[tex]10 - \frac{3104}{(x-8)^2}[/tex] = 0

[tex]10 = \frac{3104}{(x-8)^2}[/tex]

[tex](x - 8)^2 = \frac{3104}{10}[/tex]

[tex](x - 8)^2 = 310.4[/tex]

Taking square root on both sides, we get

x - 8 = 17.6

x = 17.6 + 8

x = 25.6

So, x = 25.6 cm takes the minimum.

Now let's find y.

Plug in x = 25.6 cm in equation (1)

y =  [tex]\frac{388}{25.6 - 8} + 10[/tex]

y = 22.05 + 10

y = 32.05

Therefore, the smallest poster has dimension 25.6 cm by 32.05 cm.

The minimum area of the poster given that the printed area is 388 sq.cm and the margins are 4cm top/bottom and 5cm on the sides, is found by using calculus and the area constraints. The problem can be solved by expressing width and height in terms of one another and then optimizing the area equation.

To solve the problem, we use calculus and the area constraint to find the dimensions with a minimum area. Let's denote that width of the poster is w and height is h. The entire area of the poster would then be expressed as:

(w+2*5cm)*(h+2*4cm) = poster area

On the other hand, we have a fixed constraint that states the printed area is 388cm², so we have:

w*h = 388 cm²

We can express h as 388/w and substitute this in the poster's area equation, and then use calculus to find the minimum area given these constraints.

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Answer:

x = 12

Step-by-step explanation:

Given expression is \[7x-9-11=3x+4+2x\]

Simplifying: \[7x -(9+11) = (3x+2x)+4\]

Or, \[7x - 20 = 5x + 4\]

Bringing all terms containing x to the left side of the equation and all the numeric terms to the right side:

\[7x-5x = 20 + 4\]

=> \[(7-5)x = 24\]

=> \[2x = 24 \]

=> x = \[\frac{24}{2}\]

=> x= 12

Hence the value of x which satisfies the given equation \[7x-9-11=3x+4+2x\] is 12