can someone please help me with numbers 13 and 15? will mark as brainliest

Answer:

  x ≈ 50.1  or  49.0 — depending on how you solve the triangle

Step-by-step explanation:

In the given figure, ∆IJK is marked with angles that make it similar to ∆LMN. Side lengths are given as j = 77, k = 60, m = x, n = 39, and you are asked to find the length of x.

Angle J can be found from the other angles in ∆IJK.

  J = 180° -I -K

  J = 180° -63° -48° = 69°

You will observe that angles J and K have measures 69° and 48°, respectively, and that these are congruent to corresponding angles M and N. Since corresponding angles are congruent, the triangles are similar by the AA similarity postulate.

Using the given side lengths, we can write a proportion for corresponding sides, assuming similar triangles:

  m/n = j/k

  x/39 = 77/60 . . . . . . use the given values

  x = 39·77/60 = 50.05 ≈ 50.1

The length of side x is about 50.1 units.

If we ignore triangle IJK and solve triangle LMN using the law of sines, we have ...

  m/n = sin(M)/sin(N) . . . . . sides are in proportion to sin(opposite ∠)

  x/39 = sin(69°)/sin(48°)

  x = 39·sin(69°)/sin(48°) ≈ 49.0

Solving the triangle gives x = 49.0.

__

Additional comment

Triangle IJK is "overspecified." The figure of triangle IJK given cannot be drawn to scale because the angles and side lengths are inconsistent. This puts us in the awkward position of having to guess the procedure you're intended to use to answer the question.

The first solution above is based on relations between similar triangles. The proportion of corresponding sides doesn't consider that those side lengths are inconsistent with the angles shown.

The second solution above is based only on the information given in ∆LMN. It uses the combination of given sides and angles, without reference to ∆IJK. We prefer this solution, but we suspect your grader is looking for the other solution.

The circumference of a circle can be calculated using the formula C = 2πr, where C is the circumference, π (pi) is a mathematical constant approximately equal to 3.14, and r is the radius of the circle. In this case, the radius of the circle is 8 units. You can use either 22/7 or 3.14 as an approximation for π.

Using 22/7 for π:

C = 2(22/7) * 8 = (44/7) * 8 = 352/7 ≈ 50.29 units

Using 3.14 for π:

C = 2 * 3.14 * 8 = 6.28 * 8 = 50.24 units

Both approximations yield similar results for the circumference of the circle: 50.29 units when using 22/7 and 50.24 units when using 3.14. You may choose either of these values, depending on the desired level of accuracy. Keep in mind that these are approximations, and the true value of the circumference would involve using the exact value of π.

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The sides of the quadrilateral arranged from longest to shortest are CD, AB, DA, and BC.

We have,

To arrange the length of the sides of the quadrilateral from longest to shortest, we need to calculate the length of each side of the quadrilateral using the distance formula:

Distance Formula:

If (x1, y1) and (x2, y2) are two points in a plane, then the distance between them is given by:

d = √((x2 - x1)² + (y2 - y1)²)

Using the distance formula, we can calculate the length of each side of the quadrilateral as follows:

AB = √((4 - (-5))² + (5 - 5)²) = 9

BC = √((2 - 4)² + (0 - 5)²) = √(29)

CD = √((-5 - 2)² + (-2 - 0)²) = √(74)

DA = √((-5 - (-5))² + (5 - (-2))²) = 7

Therefore,

The sides of the quadrilateral arranged from longest to shortest are CD, AB, DA, and BC.

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The median number of emails sent per day in the given survey is 23.

To find the median, we first need to arrange the data in order from smallest to largest

20 20 20 21 22 22 22 23 23 24 24 25 26 26 27 27 27 27 27 27

The median is the middle value in the ordered list. Since there are 20 observations, we can find the median as follows

The 10th observation is 24, which is the first value greater than or equal to the median.

The 9th observation is 23, which is the last value less than or equal to the median.

Therefore, the median number of E-mails sent per day is 23.

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If sentence 6 states that ¬C is true, and sentence 7 presents a conditional statement with C as the antecedent and Q as the consequent, we can use modus ponens to infer that Q is false.

Modus ponens is a deductive reasoning rule that allows us to derive a conclusion from a conditional statement and its antecedent. Therefore, we can apply modus ponens to sentence 7 given that we know ¬C from sentence 6.
Since from sentence 6 we know ¬C, we can apply modus ponens to sentence 7. To do this, follow these steps:
1. Identify the premises: One premise is sentence 6, which states ¬C. The other premise should be a conditional statement, such as "If ¬C, then P" (replace P with the relevant proposition).
2. Apply modus ponens: Modus ponens is a rule of inference that allows us to deduce a conclusion from the given premises. If we have the premises "If ¬C, then P" and "¬C", we can conclude "P" using modus ponens.
3. State the conclusion: After applying modus ponens, we can conclude "P" based on the given premises, which include sentence 6 (¬C) and the conditional statement.

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There is a 3.8% chance that this baseball team will win the World Series.

If the sports book at the highroller Casino put the odds of a certain baseball team to win the World Series at 1:25, it means that for every one time the team wins, they will lose 25 times.

To calculate the probability, we need to use the following formula:

[tex]Probability = \frac{ Number of times the event will occur }{Total number of possible outcomes}[/tex]

In this case, the number of times the team will win is 1, and the total number of possible outcomes is 1 + 25 = 26 (1 win + 25 losses).

Therefore, the probability of this baseball team winning the World Series is:

[tex]\frac{1}{26} = 0.038 or 3.8%[/tex]
So, based on the odds given by the sports book, there is a 3.8% chance that this baseball team will win the World Series.

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To create further Pythagorean triples, the simplest way is to use the Pythagorean theorem, which states that for any right triangle, the sum of the squares of the legs (the sides adjacent to the right angle) is equal to the square of the hypotenuse (the longest side).

So, given two integers, say, a and b, where a is the shorter leg, and b is the longer leg, we can find the hypotenuse, c, using the formula c^2 = a^2 + b^2. If c is an integer, then we have a Pythagorean triple (a, b, c).

For example, let a = 3 and b = 4. Using the Pythagorean theorem, we have c^2 = 3^2 + 4^2 = 9 + 16 = 25. Therefore, c = 5, which gives us the Pythagorean triple (3, 4, 5).

To create further Pythagorean triples, we can use this method with different values of a and b. For instance, if a = 5 and b = 12, then c^2 = 5^2 + 12^2 = 169, and c = 13. Thus, we have another Pythagorean triple (5, 12, 13).

In summary, to create further Pythagorean triples, we need to choose two integers, a and b, such that a^2 + b^2 = c^2, where c is an integer. By experimenting with different values of a and b, we can generate a variety of Pythagorean triples.

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Mean of the distribution of sample mean differences (men bpm - women bpm) is -4.3.

The mean of the distribution of sample mean differences (men bpm - women bpm) can be calculated using the formula:

mean difference = mean men bpm - mean women bpm

From the given information, we know that the mean men bpm is 82.8 and the mean women bpm is 87.1. Thus, the mean difference can be calculated as:

mean difference = 82.8 - 87.1
mean difference = -4.3

Therefore, the mean of the distribution of sample mean differences (men bpm - women bpm) is -4.3.

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-Bayes' theorem is used to revise probabilities when one has new information.

-Bayes' theorem is used to revise probabilities when one has new information. It relates the conditional probabilities of two events, A and B, as follows:

[tex]P(\frac{A}{B})= P(\frac{B}{A}) \frac{P(A)}{P(B)}[/tex]

-where P(A|B) is the conditional probability of A given that B has occurred, [tex]P(\frac{B}{A})[/tex] is the conditional probability of B given that A has occurred, P(A) is the prior probability of A, and P(B) is the prior probability of B.

-Bayes' theorem allows us to update our knowledge about the probability of A after we have observed B. It is widely used in fields such as statistics, machine learning, and artificial intelligence.

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The binomial distribution can be approximated with a normal distribution when the sample size is large, typically when both np and n(1-p) are greater than or equal to 10, where n is the sample size and p is the probability of success. The correct answer is (c) large.

This is known as the normal approximation to the binomial distribution.

When the sample size is small or moderate, the normal approximation may not be appropriate, and the binomial distribution should be used to make inferences about the population proportion.

In such cases, the normal distribution may not accurately reflect the skewness and kurtosis present in the distribution of the binomial variable. As a rule of thumb, if np and n(1-p) are both less than 10, then the binomial distribution should be used instead of the normal approximation.

Therefore, the correct answer is (c) large.

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Answer:

Okay, let's solve this using PEMDAS (Please Excuse My Dear Aunt Sally):

56-6x3+7

Perform operations inside parentheses: There are no parentheses.

Multiply: 6 x 3 = 18

Subtract: 56 - 18 = 38

Add: 38 + 7 = 45

So the final answer is: 45

In steps:

56-6x3+7

6 x 3 = 18 (multiply)

56 - 18 = 38 (subtract)

38 + 7 = 45 (add)

Step-by-step explanation:

The algebraic expression that represents the situation should be x + 4.

The expression x + 4 represents the sum of a variable x and a constant 4. In algebra, x is often used to represent an unknown value or a variable quantity, while constants are fixed values that do not change. Adding the two together gives us the expression x + 4. It is important to note that there is no operation or value given after the last plus sign in the expression provided, so it is incomplete. We need to know what to add to x and 4 in order to have a complete expression.

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At the initial term, both patterns display identical values (0). From there on, succeeding terms in Pattern 1 encompass greater numbers than those of Pattern 2.

In this manner, as x-value (term figure) boosts, y-value (number in the framework) begin to amplify at a more rapid rate for the former sequence than for the latter.

The alliance between their analogous terms can be declared as a linear function where y-value for Pattern 1 is equivalent to that of Pattern 2, together with an extra 4 units. Simply put, the equation can be expressed as: y = x + 4.

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Answer:

1:13

Step-by-step explanation:

We Know

11 managers, 143 engineers

What is the ratio of managers to engineers?

The ratio of managers to engineers is

11:143

Simplify by 11; we get the ratio

1:13

So, the ratio of managers to engineers is 1:13

It will take (V₂ / V₁) number of figure D to fill the volume of figure E.

Since the volume of the figures is not given, let us assume that the volume of figure D is V₁ and that of figure E is V₂. Assume that it takes {x}, figure D to fill figure E. So, we can write the relation as -

V₁ {x} = V₂

{x} = (V₂ / V₁)

So, it will take (V₂ / V₁) number of figure D to fill the volume of figure E.

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The Volume of the given composite shape is: 432 ft³

The formula for the volume of a triangular prism is:

Volume = base area * height

The volume of a cuboid is:

Volume = Length * Width * Height

Thus:

Volume of composite shape = (6 * 12 * 4) + (6 * 6 * 4)

= 432 ft³

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The z-score that has 2.5% of the normal distribution below it is approximately 2.06.

To find the z-score that has 2.5% of the normal distribution below it, we need to use the standard normal distribution table (also known as the z-table or normal distribution table). This table shows the area under the standard normal curve to the left of a given z-score.

First, we need to find the area to the left of the desired z-score, which is 2.5%. Then, we need to find the corresponding z-score in the z-table.

Looking at the z-table, we find the row that contains the first digit(s) of the desired z-score, which is 2.5 in this case. Then, we find the column that corresponds to the second decimal place of the desired z-score, which is 0.00 in this case. The intersection of this row and column gives us the area under the standard normal curve to the left of the z-score.

In this case, we find that the area to the left of the z-score is 0.4938. To find the z-score that corresponds to this area, we look in the body of the table and find the closest value to 0.4938, which is 0.01. The corresponding z-score in the row and column headers is 2.06.

Therefore, the z-score that has 2.5% of the normal distribution below it is approximately 2.06.

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We will convert the expression to infix notation using a stack. The given expression is: a b c + 2 / a c 3 b / - -, The infix notation for the given expression is: (a-(c-(3/b))-((b+c)/2))

First, let's rewrite the expression with clearer operators and operands:

abc+2/ac3b/--

Now, let's use a stack to convert the expression to infix notation. We will perform this in stages, pushing operands and operators onto the stack as needed.

1. Push 'a' onto the stack:
  Stack: [a]

2. Push 'b' onto the stack:
  Stack: [a, b]

3. Push 'c' onto the stack:
  Stack: [a, b, c]

4. Pop the last two operands and apply the operator '+':
  (b + c)
  Push the resulting expression back onto the stack:
  Stack: [a, (b+c)]

5. Push '2' onto the stack:
  Stack: [a, (b+c), 2]

6. Pop the last two operands and apply the operator '/':
  ((b+c)/2)
  Push the resulting expression back onto the stack:
  Stack: [a, ((b+c)/2)]

7. Push 'a' onto the stack:
  Stack: [a, ((b+c)/2), a]

8. Push 'c' onto the stack:
  Stack: [a, ((b+c)/2), a, c]

9. Push '3' onto the stack:
  Stack: [a, ((b+c)/2), a, c, 3]

10. Push 'b' onto the stack:
  Stack: [a, ((b+c)/2), a, c, 3, b]

11. Pop the last two operands and apply the operator '/':
  (3/b)
  Push the resulting expression back onto the stack:
  Stack: [a, ((b+c)/2), a, c, (3/b)]

12. Pop the last two operands and apply the operator '-':
  (c-(3/b))
  Push the resulting expression back onto the stack:
  Stack: [a, ((b+c)/2), a, (c-(3/b))]

13. Pop the last two operands and apply the operator '-':
  (a-(c-(3/b)))
  Push the resulting expression back onto the stack:
  Stack: [a, ((b+c)/2), (a-(c-(3/b)))]

14. Finally, pop the last two operands and apply the operator '-':
  ((a-(c-(3/b)))-((b+c)/2))

The infix notation for the given expression is:
(a-(c-(3/b))-((b+c)/2))

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There are 863,040 ways to elect a president, vice president, secretary, and treasurer from a club of 32 members.

We can solve this problem using the concept of permutations.
To elect a president, vice president, secretary, and treasurer from a club of 32 members, we need to find the number of possible arrangements.

This can be calculated using the formula for permutations: nPr = n! / (n - r)!,

where n is the total number of members and r is the number of positions to fill.
In this case, n = 32 (total members) and r = 4 (president, vice president, secretary, and treasurer).
Calculate the factorials for n and (n - r)
32! = 32 × 31 × 30 × ... × 2 × 1
28! = 28 × 27 × 26 × ... × 2 × 1
Apply the permutation formula
32P4 = 32! / (32 - 4)!
32P4 = 32! / 28!
Calculate the final answer
32P4 = (32 × 31 × 30 × 29 × 28!) / 28!
32P4 = 32 × 31 × 30 × 29.
32P4 = 863,040.

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The area of a desk pad eight yards wide and 4/5 yards long is given as follows:

A = 0.3 yd².

Considering a rectangle of length l and width w, we have that:

The dimensions for this problem are given as follows:

Hence the area is given as follows:

A = 0.375 x 0.8

A = 0.3 yd².

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Whenever a sampled population is normally distributed or whenever the conditions of the central limit theorem are fulfilled.

The sample mean is a normally distributed random variable with mean equal to the population mean and standard deviation equal to the population standard deviation divided by the square root of the sample size.
Whenever a sampled population is normally distributed or whenever the conditions of the central limit theorem are fulfilled, the sample mean is an unbiased estimator of the population mean. This means that the sample mean is a reliable and accurate representation of the true population mean under these conditions.

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The correct answer is option D

Therefore, the correct answer is option D: The set of all elements that are in C but not in B, or are in A.

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If a and b are integers, the notation a | b denotes that a divides b, or in other words, that b is a multiple of a. The symbol "|" is read as "divides." For example, we write 2 | 6, which means that 2 divides 6 since 6 is a multiple of 2.

On the other hand, the notation a / b denotes the quotient of a divided by b, or in other words, the result of dividing a by b. The symbol "/" is read as "divided by." For example, we write 6 / 2 = 3, which means that the quotient of 6 divided by 2 is equal to 3.

It is important to note that the notation a | b and a / b are not equivalent. The former is a statement about the divisibility of two integers, while the latter is a numerical expression representing the result of dividing one integer by another.

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From the given triangle, the value of the given green box / unknown variable is 13. So, correct option is B.

To find the length of side AC, we can use the law of sines, which states that in any triangle ABC,

a/sin A = b/sin B = c/sin C

where a, b, and c are the lengths of the sides opposite the corresponding angles A, B, and C.

In this case, we know the length of side BC (b) is 15, and the measures of angles B and C are 50 and 35 degrees, respectively. Therefore, we can set up the following equation:

15/sin 50 = AC/sin 35

To solve for AC, we can multiply both sides by sin 35:

AC = (15/sin 50) * sin 35

Using a calculator, we can evaluate this expression to find that AC is approximately 13. Therefore, the answer is not one of the options given.

So, correct option is B.

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Answers:

The first answer is 10

Second answer 7.5

The 95% confidence interval that the true mean income for parking meters in the resort community falls between $3.14 and $5.28 per day.

To find the 95% confidence interval for the true mean income of parking meters in the resort community, we can use a t-distribution since our sample size is small (n=10).
First, we need to find the sample mean and standard deviation. The sample mean is simply the average of the incomes:
x = 4.21
The sample standard deviation can be found using the formula:
s = √[ Σ(xi - x)² / (n-1) ]
Now that we have the sample mean and standard deviation, we can use a t-distribution to find the 95% confidence interval. We need to find the t-value with 9 degrees of freedom (n-1), since our sample size is 10.
Using a t-table or calculator, we can find that the t-value with 9 degrees of freedom and a 95% confidence level is approximately 2.262.
The formula for the confidence interval is:
CI = x ± (t-value x s / √n)
Plugging in the values:
CI =($3.14, $5.28)
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The probability of drawing 2 yellow markers and 2 red markers is approximately 0.2697.

To find the probability of drawing 2 yellow markers and 2 red markers, we need to calculate the total number of ways to draw 4 markers from the bag, as well as the number of ways to draw 2 yellow and 2 red markers.

The total number of ways to draw 4 markers from the bag is:

¹⁴C₄ = (14!)/(4!*(14-4)!) = 1001

This is because there are 14 markers in total, and we are choosing 4 of them.

To find the number of ways to draw 2 yellow and 2 red markers, we can use the combination formula again. The number of ways to choose 2 yellow markers from 4 yellow markers is:

⁴C₂ = (4!)/(2!*(4-2)!) = 6

Similarly, the number of ways to choose 2 red markers from 10 red markers is:

¹⁰C₂ = (10!)/(2!*(10-2)!) = 45

Therefore, the number of ways to draw 2 yellow and 2 red markers is:

6 * 45 = 270

Now we can find the probability of drawing 2 yellow and 2 red markers by dividing the number of ways to draw 2 yellow and 2 red markers by the total number of ways to draw 4 markers:

P(2 yellow and 2 red) = 270/1001 = 0.2697 (rounded to four decimal places)

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The probability of drawing 2 yellow marker and 2 red markers 15/1078

A probability is a number that reflects the chance or likelihood that a particular event will occur. The certainty an event will occur is 1 which is equivalent to 100%.

Probability = sample space / total outcome

for the first draw ;

probability of picking yellow = 2/14 = 1/7

second draw;

probability of picking yellow = 1/13

third draw;

probability of picking red = 10/12 = 5/6

fourth draw;

probability of picking red = 9/11

Probability of picking two yellow = 2/14 × 1/7 = 2/98 = 1/49

probability of picking two reds = 5/6 × 9/11 = 45/66 = 15/22

probability of picking 2 yellow and 2 red = 1/49 × 15/22 = 15/1078

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The solution is, : The probability that a girl will win free popcorn is 4/21.

Here, we have,

⇒This question is on probability

⇒Number of boys=3

⇒Number of girls=4

⇒P(S)= 4+3=7

Probability for a girl to win is= 4/7

We have 3 awards a free movie ticket, a collectible poster, or a free popcorn

P(S)= 3

Probability of being awarded a free popcorn = 1/3

The probability that a girl will win free popcorn =4/21

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complete question:

Three boys and four girls enter a contest at the local movie theater. A randomly chosen winner will be awarded a free movie ticket, a collectible poster, or free popcorn. What is the probability that a girl will win free popcorn?

This means that the car needs to go at least 64 mph to overtake the bus in 5 hours, and it needs to cover the same distance as the bus did in those 3 hours, which is 120 miles.

To figure out the speed the car needs to go to overtake the bus in 5 hours, we first need to figure out how far the bus travels in those 5 hours.

Since the bus travels for 3 hours before the car starts, we can find the distance the bus travels in those 3 hours by using the formula:

distance = rate × time

where the rate is the speed of the bus, which is 40 mph, and the time is 3 hours.

So the distance the bus travels in those 3 hours is:

distance = 40 mph × 3 hours = 120 miles

Now, for the car to overtake the bus in 5 hours, it needs to cover the same distance the bus did in 3 hours plus some additional distance to get ahead of the bus. Let's call this additional distance "x".

So, the total distance the car needs to travel is:

total distance = 120 miles + x

Now we can set up an equation that relates the distances and speeds of the car and the bus:

distance covered by car = distance covered by bus + x

rate of car × time = rate of bus × time + x

where the rate of the bus is 40 mph, the time is 5 hours (since that's how long it takes for the car to overtake the bus), and the rate of the car is what we're trying to find.

Substituting the values we know:

rate of car × 5 hours = 40 mph × 8 hours + x

Simplifying:

rate of car = (40 mph × 8 hours + x) / 5 hours

We still need to find the value of "x". To do this, we can use the fact that the car overtakes the bus, which means that the distance covered by the car is greater than the distance covered by the bus:

distance covered by car > distance covered by bus

rate of car × time > rate of bus × time

rate of car × 5 hours > 40 mph × 8 hours

rate of car > 64 mph

So the car needs to go faster than 64 mph to overtake the bus in 5 hours.

To find the value of "x", we can substitute the rate of the car into the earlier equation:

rate of car × 5 hours = 40 mph × 8 hours + x

64 mph × 5 hours = 40 mph × 8 hours + x

320 miles = 320 miles + x

x = 0

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Answer:

29.4

Step-by-step explanation:

the are of a parallelogram is =base ×height

height=sin 45×6

height=4.2

base is 7

7×4.2

The price of the stereo system after the markup was $691.20.

The original price of the stereo system was $720.

During the sale, the price was reduced by 20%, which is equivalent to multiplying by (1 - 0.2) = 0.8.

The discounted price was:

720 × 0.8 = $576

After the sale, the discounted price was marked up by 20%

It is equivalent to multiplying by (1 + 0.2) = 1.2.

So the final price was 576 × 1.2

= $691.20

Therefore, the price of the stereo system after the markup was $691.20.

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