Which one is it I know it’s not 5 or 2

95% confident that the true population mean backpack weight falls between 49.06 and 54.94 ounces.

To construct a 95% confidence interval for the true population mean backpack weight, we can use the following formula:

Confidence interval = mean weight ± (critical value x standard error)

Where the critical value is determined based on the level of confidence and the degrees of freedom (n-1), and the standard error is calculated as the population standard deviation divided by the square root of the sample size.

In this case, since we have a sample size of 27, the degrees of freedom would be 26. Using a t-distribution table, we can find the critical value for a 95% confidence level with 26 degrees of freedom to be 2.056.

The standard error can be calculated as:

standard error = 7.7 / sqrt(27) = 1.48

Therefore, the 95% confidence interval can be calculated as:

Confidence interval = 52 ± (2.056 x 1.48) = (49.06, 54.94)

This means that we can be 95% confident that the true population mean backpack weight falls between 49.06 and 54.94 ounces, based on the sample of 27 backpacks with a mean weight of 52 ounces and a population standard deviation of 7.7 ounces.

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Answer: The integral of sin(x)dx on the interval [0, pi/4] is:

∫sin(x)dx = -cos(x) + C

where C is the constant of integration.

To evaluate this definite integral on the interval [0, pi/4], we substitute pi/4 for x in the antiderivative and then subtract the value of the antiderivative at x=0:

cos(pi/4) - (-cos(0)) = -(√2/2) - (-1) = 1 - √2/2

Therefore, the value of the integral of sin(x)dx on the interval [0, pi/4] is 1 - √2/2.

In 2020, the number of connections per person in North America was 1.4, while in the Asia-Pacific (APAC) region, it was 1.1. To determine the number of unique users in each region, we need to take into account the total population and the connections per person.

First, we should understand that a higher number of connections per person does not necessarily mean more unique users. In fact, it could imply that users in North America have multiple connections, such as smartphones, tablets, and other devices, whereas users in APAC may have fewer devices per person.

In order to calculate the number of unique users in each region, we need to know the total population for both North America and APAC in 2020. Once we have the population figures, we can divide the total number of connections in each region by the connections per person. This will give us an estimate of the unique users in both regions.

Finally, to find out how many more unique users there were in APAC in 2020 compared to North America, we can subtract the number of unique users in North America from the number of unique users in APAC. This difference will show the additional unique users present in the APAC region during 2020.

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The volume of the figure which has 2 rectangular prisms can be found to be 276 cm ³.

To find the volume of this composite figure, you need to find the volume of each of the individual rectangles.

Volume of rectangular prism 1:

= Length x Width x Height

= 10 x 6 x 3

= 180 cm ³

Volume of rectangular prism 2:

= Length x Width x Height

= 4 x 6 x 4

= 96 cm ³

The volume of the entire figure is therefore ;

= 180 + 96

= 276 cm ³

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Answer:

[tex] \sqrt{ \frac{75}{3} } = \sqrt{25} = 5[/tex]

The voltage drop across each capacitor in the circuit will be 3 V, 2 V, and 1.5 V, respectively.

It is true that in a series circuit, each capacitor has the same charge, it does not mean that each branch will have the same charge.

In this specific circuit, the charge on the capacitors will be different in each branch, depending on the capacitance of the capacitor and the voltage drop across it.

The total charge on the capacitors in the circuit will be the same.

If we assume that each capacitor has a charge of 6 µC, then the total charge on the three capacitors in the circuit will be:

Q_total = 3 × 6 µC

= 18 µC

The capacitance of each capacitor, we can then calculate the voltage drop across each capacitor using the formula:

Q = CV

Q is the charge on the capacitor, C is its capacitance, and V is the voltage drop across it.

For the capacitor with a capacitance of 2 µF:

V1 = Q/C1

= 6 µC / 2 µF

= 3 V

For the capacitor with a capacitance of 3 µF:

V2 = Q/C2

= 6 µC / 3 µF

= 2 V

For the capacitor with a capacitance of 4 µF:

V3 = Q/C3

= 6 µC / 4 µF

= 1.5 V

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The original price of the shoe before the discount was applied is $88

A pair of shoes is on sale for $76.50

A discount of 15% was applied on the shoe

The original price of the shoe can be calculated as follows

=15/100 × 76.50

= 0.15 × 76.50

= 11.5

= 11.5 + 76.50

= 88

Hence the original price of the shoes before the application of discount is $88

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The system of equation for the given system  in the form x = p(t)x + f(t) is equal to x = [-1 -3t] x + [sint]

                    [0 + 3]x +  [cost]  

System of equation is,

,x₁′=2x₁−3tx₂ + sint,

x₂′=([tex]e^{t}[/tex])x₁ 3x₂ + cost

System in the form x = p(t)x + f(t), first express it in matrix form,

x' = A(t)x + g(t)

where x = [x₁, x₂]ᵀ,

A(t) is a 2x2 matrix,

and g(t) is a column vector with entries sint and cost.

Using the given system, we have,

x₁′ = 2x₁ - 3tx₂ + sint

x₂′ = eᵗx₁ + 3x₂ + cost

Rewriting this in matrix form, we get,

[tex][x_{1}]^{'} = [2 -3t] \left[\begin{array}{ccc}x_{1}^{} \\x_{2}^{} \end{array}\right][/tex] +  [sint]

[tex]\left[\begin{array}{ccc}x_{2}^{'} \end{array}\right][/tex]  [tex]= \left[\begin{array}{ccc}e^{t} &3\end{array}\right][/tex][tex]\left[\begin{array}{ccc}x_{1}^{} \\x_{2}^{} \end{array}\right][/tex]+ [cost]

Now, to write this in the form x = p(t)x + f(t),

we need to find a function P(t) such that A(t) = P(t) - P'(t),

where P'(t) is the derivative of P(t).

For A(t), we have,

A(t) = [2 -3t]

        [eᵗ 3 ]

To find P(t), integrate the diagonal entries of A(t),

P(t) = [2 3t]

        [eᵗ 3]

Then,  compute P'(t) and subtract it from P(t) to get A(t),

P'(t) = [0 3]

        [eᵗ 0]

A(t) = P(t) - P'(t)

     = [2-3t -0 -3]

[eᵗ - eᵗ + 3 - 0]

Therefore, the system of equation x' = A(t)x + g(t) can be written as,

x = [-1 -3t] x + [sint]

     [0 + 3]x +  [cost]  which is in the form x = p(t)x + f(t).

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The above question is incomplete, the complete question is:

Write the system ,x₁′=2x₁−3tx₂ + sint, x₂′=(e^t)x₁ 3x₂ + cost in the form.

x=p(t)x + f(t)

Answer:

120

Step-by-step explanation:

since 60 = 1 hour

60 divided by 4 = 15

15 x 8 = 120

Answer:

Step-by-step explanation:

CM is the perpendicular bisector of AB at M, it means that CM is perpendicular to AB, and AM=BM. Therefore, we have two right triangles, triangle AMC and triangle BMC, with a shared side CM, and AM=BM.

By the Pythagorean theorem, we know that in a right triangle, the square of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides. Applying this to triangles AMC and BMC, we have:

AC² = AM² + CM²

BC² = BM² + CM²

Since AM=BM, we can substitute AM for BM in the second equation, giving:

BC² = AM² + CM²

Since the left-hand sides of these two equations are equal (by the given that CM is the perpendicular bisector of AB), we can set their right-hand sides equal to each other and simplify:

AC² = BC²

Taking the square root of both sides gives us:

AC = BC

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For the parametrically defined surface ds = ∫0²π ∫[tex]0^1[/tex] F(sin(v), cos(v), z) dz dv

What is trigonometry?

Trigonometry is a branch of mathematics that deals with the relationships between the sides and angles of triangles.

To find the differentials of the given surface S, we need to first calculate the necessary derivatives:

r_u = <0, 0, 1>

r_v = <cos(v), -sin(v), 0>

We can then use these derivatives to calculate the differential of S:

dS = ||r_u x r_v|| du dv

= ||<cos(v), sin(v), 0>|| du dv

= ||<cos(v), sin(v)>|| du dv

= 1 du dv

Next, we can find the differential of a scalar function F(x, y, z) in terms of the surface S:

dF = ∇F · dS

= <Fx, Fy, Fz> · <cos(v), sin(v), 0> du dv

= Fx cos(v) du dv + Fy sin(v) du dv

Finally, we can use this differential to calculate the integral of F over the surface S:

∫∫S F(x, y, z) dS

= ∫∫S F(r(u,v)) ||r_u x r_v|| du dv

= ∫0^2π ∫0^1 F(sin(v), cos(v), u) du dv

Note that the limits of integration correspond to the range of u and v in the parametric representation of the surface. We can use the substitution u = z to convert the differential from dS to ds:

dS = ||r_u x r_v|| du dv

= ||<cos(v), sin(v), 0>|| du dv

= 1 du dv

ds = ||r_u x r_v|| dz dv

= ||<cos(v), sin(v), 0>|| dz dv

= ||<cos(v), sin(v)>|| dz dv

= 1 dz dv

This gives us:

∫∫S F(x, y, z) dS

= ∫∫S F(r(u,v)) ||r_u x r_v|| du dv

= ∫0²π ∫[tex]0^1[/tex] F(sin(v), cos(v), u) du dv

= ∫0²π ∫[tex]0^1[/tex] F(r(u,v)) ||r_u x r_v|| dz dv

= ∫0²π ∫[tex]0^1[/tex] F(sin(v), cos(v), z) dz dv

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The t-value is 0.702 if the area on the right tail is 0.25 with 9 degrees of freedom. The t-value is 2.479 if the area in the right tail is 0. 01 with 28 degrees of freedom. The t-value is -2.447 if the area left of the t-value is 0. 02 with 6 degrees of freedom.

To find the t-value such that the area in the right tail is 0.25 with 9 degrees of freedom, we can use a t-table or a calculator with t-distribution functions. Using a t-table with 9 degrees of freedom, we find that the t-value with an area of 0.25 in the right tail is approximately 0.702.

To find the t-value such that the area in the right tail is 0.01 with 28 degrees of freedom, we can again use a t-table or a calculator with t-distribution functions. Using a t-table with 28 degrees of freedom, we find that the t-value with an area of 0.01 in the right tail is approximately 2.479.

To find the t-value such that the area left of the t-value is 0.02 with 6 degrees of freedom, we can use the symmetry property of the t-distribution. Since the t-distribution is symmetric about 0, the t-value such that the area left of it is 0.02 is the same as the t-value such that the area in the right tail is 0.02. Using a t-table with 6 degrees of freedom, we find that the t-value with an area of 0.02 in the right tail is approximately 2.447. Therefore, the t-value such that the area left of it is 0.02 is approximately -2.447.

To find the critical t-value that corresponds to 90% confidence with 20 degrees of freedom, we can use a t-table or a calculator with t-distribution functions. Since we want to find the t-value that has an area of 0.05 in each tail (since the confidence interval is symmetric), we can find the t-value with an area of 0.95 in the middle. Using a t-table with 20 degrees of freedom, we find that the t-value with an area of 0.95 in the middle is approximately 1.725. Therefore, the critical t-value for 90% confidence with 20 degrees of freedom is approximately ±1.725.

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The ending balance in Richard’s checkbook register is $1,009.81

In starting the amount of Richard has in his account is $900.00

All the amount of money which will be credited or deposit in the account that means the money is added in the account .

Al the amount of money that will be debited or payment from the account will be subtracted from the account .

Credited or deposit = $390.36 + $390.36 + $390.36 + $390.36

Debited or payment = $455.00 + $125.40 + $155.44 + $455.00 + $9.20 + $251.59

Total amount of money left = Base money + credited money - debited money

Total amount of money left  = 900 + 1561.44 - 1451.63

Total amount of money left = $1,009.81

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The given question is incomplete the complete question is :

Richard’s checkbook register as of 02/19: Check # Date Description of Transaction Payment/Debit (-) Fee (-) Deposit/Credit (+) Balance 02/03 Deposit $900.00 $900.00 02/05 Deposit - Paycheck $390.36 $1,290.36 201 02/05 Blue Sky Apartments $455.00 $835.36 202 02/07 Renter’s Insurance $125.40 $709.96 203 02/18 Online Clothing Purchase $155.44 $554.52 02/19 Deposit - Paycheck $390.36 $944.88 Enter the following transactions into Richard’s checkbook register and state his ending balance: Date Type Description Amount 03/01 Check #204 Blue Sky Apartments $455.00 03/05 DEP Payroll automatic deposit $390.36 03/08 Debit Benny’s Hamburgers and Fries $9.20 03/15 Check #205 Car payment $251.59 03/19 DEP Payroll automatic deposit $390.36 a. $715.79 b. $1,009.81 c. $780.72 d. $880.24

The range of the Morning box plot is the same as the range of the Afternoon box plot. Therefore, the correct answer is option A.

A box and whisker plot—also called a box plot—displays the five-number summary of a set of data. The five-number summary is the minimum, first quartile, median, third quartile, and maximum. In a box plot, we draw a box from the first quartile to the third quartile. A vertical line goes through the box at the median.

Number of sales in Afternoon:

Minimum value = 4

First quartile = 8

Median = 14

Third quartile = 15

Maximum value = 16

Here, the range is 16-4=12

Number of sales in Morning:

Minimum value = 3

First quartile = 5

Median = 8

Third quartile = 12

Maximum value = 15

Here, the range is 15-3=12

Therefore, the correct answer is option A.

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The standard deviation of the sampling distribution can be calculated using the formula:  standard deviation = sqrt [p(1-p)/n] . Therefore, the mean of the sampling distribution is 0.5 and the standard deviation is 0.025.

The mean of the sampling distribution of possible sample proportions is equal to the population proportion, which is p = 0.5. The standard deviation of the sampling distribution can be calculated using the formula:

standard deviation = sqrt [p(1-p)/n]

Plugging in the values, we get:

standard deviation = sqrt [(0.5)(1-0.5)/400]

standard deviation = sqrt [(0.25)/400]

standard deviation = 0.025

Therefore, the mean of the sampling distribution is 0.5 and the standard deviation is 0.025.

To find the mean and standard deviation of the sampling distribution for sample proportions, you can use the following formulas:

Mean (μ) = p
Standard Deviation (σ) = √(p(1-p)/n)

Given the sample size (n) = 400 and population proportion (p) = 0.5, you can calculate the mean and standard deviation as follows:

Mean (μ) = 0.5
Standard Deviation (σ) = √(0.5(1-0.5)/400) = √(0.5*0.5/400) = √(0.125/100) = √(0.00125) ≈ 0.0354

So, the mean of the sampling distribution is 0.5 and the standard deviation is approximately 0.0354.

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The group of athletes that ran the least miles is Group C, with a median value of 2.5 miles. Therefore, the last option is correct.

When a dataset is sorted in ascending order, the median represents the middle value in the dataset. In this question, Group C's median distance is 2.5 miles, meaning that 50% of its participants can run lesser than or equal to 2.5 miles.

Whereas the median for Group B is 7 miles, which is more than the median for Group C. Therefore, in conclusion, we may say that Group C ran the least miles. The median figure, rather than the spread or range of the data, is what matters in this situation when determining which group ran the fewest miles.

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The length of the cuboid is 10 cm .

As the cuboid has six rectangular faces, the total surface area of the cuboid is calculated as follows: Assume that, l, w, h be the length, width, and height of the cuboid respectively. Therefore, the total surface area of the cuboid is 2 (lh + lw+ hw) square units.

Surface area of cuboid = 340 cm²

∵ Surface area of cuboid = 2(lb + bh + hl)

So,

⇒ 2(lb + bh + hl) = 340

⇒ 2(l × 8 + 8 * 5 + 5 * l) = 340

⇒ 2(8l + 40 + 5l) = 340

⇒ 13l + 40 = 340/2

⇒ 13l + 40 = 170

⇒ 13l = 170 - 40

⇒ 13l = 130

⇒ l = 130/13

⇒ l = 10 cm

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The given question is incomplete, complete question is:

The surface area of a cuboid is 340 cm2. If its breadth is 8 cm and height is 5 cm, then find its length.

Answer: C

Step-by-step explanation: I took the test

The question is about scale drawings in mathematics. If the model on the left TV has an 11 cm diagonal, and the right TV is a scaled version twice as large, the diagonal of the right TV would be 22 cm.

This question deals with scale drawing relationships. Scale drawings are often used in geometry and mathematics to depict real-life objects at a scale that can be easily studied. When the aspect ratio (the ratio of width to height) remains the same, if one dimension (like the diagonal in this case) of an object is doubled, all other dimensions are also doubled.

So if the television on the left has an 11 cm diagonal, then the television on the right, which is a scaled version in which the diagonal is twice as long, would measure 22 cm diagonally. Hence, the correct option is A. 22 cm.

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The standard form for the quadratic function is g(x) = x² + 2x - 1.

The standard form for a quadratic function is:

f(x) = ax² + bx + c

where a, b, and c are constants.

Out of the given options, the quadratic function that is already in standard form is:

g(x) = x² + 2x - 1

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Answer: The expected value of V can be calculated as the sum of the products of the possible values of V and their corresponding probabilities. Let's consider the three possible scenarios:

Using the utility function, we can see that the expected value of V is:

E[V] = 0 * 0.2 + (1/2) * (0.8 * 9/10) + 10 * (0.8 * 1/10)

E[V] = 0 + 0.36 + 0.8

E[V] = 1.16

Therefore, the expected value of V is 1.16. However, since V represents the number of healthy vacation days, it must be a non-negative integer. So, the closest integer to 1.16 is 1. Therefore, the answer is c. 2.

Constraints are restrictions that limit the settings of the decision variables in a linear programming model.

Constraints in a linear programming model are restrictions that limit the settings of the decision variables, which are input variables that can be controlled during optimization.

These decision variables are often defined by specific quantities to be maximized or minimized in the model.

Therefore, constraints are a group of answer choices or restrictions that must be considered when developing a mathematical model to optimize certain variables or quantities.

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The hypothesis test is a one-tailed test, since we are testing for a specific direction (greater than 72%).

An assumption is said to as a hypothesis when it is supported by evidence. Any investigation that turns the research questions into predictions must start here. Variables, the population, and the relationships between the variables are among its constituent parts.

The hypotheses for the test are:

H0: p = 0.72 (null hypothesis)

Ha: p > 0.72 (alternative hypothesis)

The claim is that the proportion of college students who recycle is greater than 72%, which corresponds to the alternative hypothesis.

The hypothesis test is a one-tailed test, since we are testing for a specific direction (greater than 72%).

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To determine whether the process is in control or not, we can use a control chart. The control chart is a graphical tool used to monitor the stability of a process over time by plotting the sample statistics such as means or proportions over time and comparing them to control limits.

In this case, we are interested in monitoring the proportion of claims that were mailed within the five-day limit. We will use a p-chart, which is a control chart used to monitor the proportion of nonconforming items in a sample.

The formula for the p-chart is:

p = (number of nonconforming items in the sample) / (sample size)

The control limits for the p-chart are:

Upper control limit (UCL) = p-bar + 3sqrt(p-bar(1-p-bar)/n)

Lower control limit (LCL) = p-bar - 3sqrt(p-bar(1-p-bar)/n)

where p-bar is the overall proportion of nonconforming items, n is the sample size, and sqrt is the square root function.

Let's calculate the p-chart for the given data. The total number of samples is 24 and the sample size is 100.

First, we calculate the proportion of claims that were mailed within the five-day limit for each sample:

p1 = 1 - 12/100 = 0.88

p2 = 1 - 14/100 = 0.86

p3 = 1 - 18/100 = 0.82

p4 = 1 - 10/100 = 0.90

p5 = 1 - 8/100 = 0.92

p6 = 1 - 12/100 = 0.88

p7 = 1 - 13/100 = 0.87

p8 = 1 - 17/100 = 0.83

p9 = 1 - 13/100 = 0.87

p10 = 1 - 12/100 = 0.88

p11 = 1 - 15/100 = 0.85

p12 = 1 - 21/100 = 0.79

p13 = 1 - 19/100 = 0.81

p14 = 1 - 17/100 = 0.83

p15 = 1 - 23/100 = 0.77

p16 = 1 - 24/100 = 0.76

p17 = 1 - 21/100 = 0.79

p18 = 1 - 9/100 = 0.91

p19 = 1 - 20/100 = 0.80

p20 = 1 - 16/100 = 0.84

p21 = 1 - 11/100 = 0.89

p22 = 1 - 8/100 = 0.92

p23 = 1 - 20/100 = 0.80

p24 = 1 - 7/100 = 0.93

Next, we calculate the overall proportion of claims that were mailed within the five-day limit:

p-bar = (p1+p2+...+p24)/24 = 0.8575

Then, we calculate the control limits for the p-chart:

UCL = p-bar + 3sqrt(p-bar(1-p-bar)/n) = 0.8992

LCL = p-bar - 3sqrt(p-bar(1-p-bar)/n) = 0.8158

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The dimensions of the rectangle for the given area 65 square inches are 13in and 5in.

Dimensions of the rectangle are length and width.

Let us consider length of the rectangle = x + 6

And width of the rectangle = x -2

Area of the rectangle = 65 square inches

Area of the rectangle = length × width

Substitute the values we have,

⇒ 65 = ( x + 6 ) × ( x -2 )

⇒65 = x² + 4x -12

⇒x² + 4x - 77 = 0

⇒x² + 11x - 7x - 77 = 0

⇒ x( x+ 11 ) -7 ( x + 11 ) =0

⇒ ( x+ 11) ( x - 7) = 0

⇒ x = -11 or x = 7

Dimensions can not be negative.

⇒ x = 7

Length = 7 + 6

            = 13 in

Width = 7 - 2

          = 5in.

Therefore, the dimensions of the rectangle are 13in and 5in.

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Answer:

If the coefficient of determination is .798, then 79.8% of the data about this regression line is explained, so 20.2% of the data about this regression line is unexplained.

For the angle of elevation to the top of a building is 5 degrees from the ground, the height of building is equals to 0.1 miles.

A buliding in New York. The angle of elevation to the top of a building from ground = 5°

Distance from ground point to base of building = 1 mile

We have to determine the height of the building. Now, if we consider all scenario geometrically, then we see the right angled triangle present in above figure. The height of buliding = h

Using the Trigonometric Ratio [tex] tan(\theta) = \frac{height}{base} [/tex]

Substitute all known values in above formula, [tex]tan(5°) = \frac{h}{1 \: miles} [/tex]

From the trigonometric table, tan(5°) = 0.087

=> h = 1 × 0.087 miles

=> h = 0.087 miles ~ 0.1 miles

Hence, required height value is 0.1 miles

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Every mile traveled along the stream, the elevation changes by 50 feet/mile.

The gradient of the stream can be calculated by dividing the elevation change by the distance traveled. In this case, the stream has an elevation change of 100 feet over a distance of 2 miles. Thus, the gradient can be calculated as:

Gradient = Elevation change / Distance traveled

= 100 feet / 2 miles

= 50 feet/mile

The gradient is an important concept in many fields, including geology, hydrology, and civil engineering. It represents the rate at which a physical quantity, such as elevation or temperature, changes with distance. A steep gradient indicates a rapid change, while a gentle gradient indicates a slow change.

Therefore, the answer is option (a) 50 feet/mile. This means that for every mile traveled along the stream, the elevation changes by 50 feet.

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The critical value of t depends on both the confidence level and the degrees of freedom.

The sample size increases, the degrees of freedom also increase, and the t-distribution approaches the normal distribution.

The z-distribution to find the critical value of z for a given confidence level.

The critical value of t for a given confidence level and degrees of freedom, we can use statistical software or online calculators.

These tools typically provide tables or functions that allow us to look up or calculate the appropriate value.

The critical value of t for a 95% confidence interval with 10 degrees of freedom.

Using an online t-distribution calculator, we can enter the values of the confidence level and degrees of freedom and obtain the result, which in this case is approximately 2.228.

If we want to construct a 95% confidence interval for a sample with 10 degrees of freedom, we would use the formula:

[tex]\bar x \pm t \times (s/\sqrt n)[/tex]

[tex]\bar x[/tex] is the sample mean, s is the sample standard deviation, n is the sample size, and t is the critical value we just obtained.

The critical value of t for a confidence interval, we need to know the confidence level and degrees of freedom, and we can use statistical software or online calculators to obtain the appropriate value.

This value is used in the formula for constructing the confidence interval, which depends on the sample statistics and the size of the sample.

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When both countries produce at full employment, Country A should focus on producing computers, and Country B should focus on producing steel. This arrangement allows them to maximize their resources and benefit from trade.

Based on the given production alternatives for countries A and B, the correct statement regarding their production of computers and steel at full employment is:

"Country A has a comparative advantage in producing computers, while Country B has a comparative advantage in producing steel."

Here's a step-by-step explanation:

1. Calculate the opportunity cost for each country:
- Country A: To produce 1 computer, they give up 1 unit of steel (100 computers = 100 units of steel).
- Country B: To produce 1 computer, they give up 4 units of steel (20 computers = 80 units of steel).

2. Identify the comparative advantage:
- Country A has a lower opportunity cost for producing computers (1 unit of steel), so they have a comparative advantage in computer production.
- Country B has a higher opportunity cost for producing computers but a lower opportunity cost for producing steel, so they have a comparative advantage in steel production.

Thus, when both countries produce at full employment, Country A should focus on producing computers, and Country B should focus on producing steel. This arrangement allows them to maximize their resources and benefit from trade.

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