5x+2y=-3, 3x+3y=9 elimination method

15.5% can be expressed as the decimal 0.155.

Converting 15.5% to a fraction and a decimal:

To convert a percent to a fraction, we can simply divide it by 100 and simplify the resulting fraction. To convert a percent to a decimal, we can divide it by 100.

So, to convert 15.5% to a fraction, we can write:

15.5% = 15.5/100

To simplify this fraction, we can divide both the numerator and denominator by 5:

15.5/100 = 3.1/20

Therefore, 15.5% can be expressed as the fraction 3.1/20 in simplest form.

To convert 15.5% to a decimal, we can divide 15.5 by 100:

15.5% = 0.155

Therefore, 15.5% can be expressed as the decimal 0.155.

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85% confidence interval would be the narrowest. The correct answer is option d.

The width of a confidence interval depends on the level of confidence and the variability of the data. A higher level of confidence requires a wider interval, while a lower level of confidence results in a narrower interval. Similarly, if the data is more variable, the interval will be wider, and if the data is less variable, the interval will be narrower.

Since a 85% confidence interval provides less confidence than the other options, it will be the narrowest. A narrower interval can be useful in situations where there is less variability in the data, or when a narrower range of values is of particular interest.

However, it is important to balance the level of confidence with the precision of the estimate when selecting a confidence interval.

The correct answer is option d.

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To solve for y, we need to isolate y on one side of the equation.

We can start by multiplying both sides of the equation by 7, which will cancel out the 7 in the denominator on the left-hand side:

-28 = y/7

-28 * 7 = y

-196 = y

Therefore, y = -196.

So the solution for y is -196.

Yes, { 13 x (25+ 15) } and { (13x25) + (13x25) } are equal.

In mathematics, a binary operation is commutative if changing the order of the operands does not change the result. It is a fundamental property of many binary operations, and many mathematical proofs depend on it.

{ 13 x (25+ 15) } = 13 x 40 = 520

{ (13x25) + (13x25) } = 325 + 325 = 650

From the result, we can conclude that both expressions yield the same value, which is 520. This demonstrates the commutative property of multiplication, which states that the order of multiplication does not affect the result.

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The town's population in 2001, as predicted by the equation, was approximately 25446.

According to the given equation yˆ=135.23x−245,121.9, the town's population in year x can be predicted. To find the population of the town in 2001, we need to substitute x = 2001 in the equation.

yˆ = 135.23x − 245,121.9

yˆ = 135.23(2001) − 245,121.9

yˆ = 270568.23 - 245,121.9

yˆ = 25446.33

Therefore, the town's population in 2001, as predicted by the equation, was approximately 25446.33. Rounded to the nearest whole number, the population was 25446.

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Each inch on the map represents 20feet.

To determine what the inch on the map represents, we need to first sum the total distance traveled by the unique routes as follows:

3 inches + 2 inches + 1.5 inches + 0.25 inches = 6.75 inches.

Next, we denote the actual distance of the entire route as 135 feet.

So, to calculate the actual inch, we divide the actual distance in feet by the total distance in inches as follows:

We convert inches to feet to get 0.56

135 feet/ 6.75 Inches

= 20 feet

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The area of the rectangle is 75 square centimeters.

Let's call the width of the rectangle "w". Then, according to the problem, the length of the rectangle is three times the width, which we can write as "l = 3w".

The formula for the perimeter of a rectangle is: P = 2(l + w)

We know that the perimeter of this rectangle is 40 cm, so we can substitute the expressions we have for "l" and "w" to get:

40 = 2(3w + w)

Simplifying:

40 = 2(4w)

20 = 4w

w = 5

So the width of the rectangle is 5 cm, and the length is three times that, or 15 cm.

To find the area of the rectangle, we use the formula:

A = lw

A = (5)(15)

A = 75

Therefore, the area of the rectangle is 75 square centimeters.

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Answer:

[tex] - 1 \leqslant d < 5 \\ [/tex]

The Linnaean class system provides a framework for understanding the diversity of life on Earth by grouping similar organisms together based on shared characteristics.

By comparing and contrasting the definitions of each class, we can see how different groups of animals are related to each other and how they differ in terms of their biological traits.

The Linnaean class system is a way of organizing living things based on shared characteristics. Let's compare and contrast the definitions of the Linnaean classes using a Venn diagram.

First, we have the class Mammalia, which includes all animals that have hair or fur, produce milk to feed their young, and have specialized teeth. This class overlaps with the class Aves, which includes all birds, because some birds have specialized beaks and feathers that are similar to mammalian hair and teeth. However, birds do not produce milk.

Next, we have the class Reptilia, which includes animals that are cold-blooded, lay eggs, and have scales or plates on their skin. This class overlaps with both Mammalia and Aves in terms of species that lay eggs, such as monotremes (platypus and echidnas) and some birds (ostriches and emus). However, reptiles lack specialized teeth and do not produce milk.

Finally, we have the class Amphibia, which includes animals that are cold-blooded, breathe through their skin, and undergo metamorphosis from a water-dwelling larval stage to a land-dwelling adult stage. This class overlaps with Reptilia in terms of some shared characteristics, but Amphibia also lacks specialized teeth and does not lay eggs with hard shells like reptiles.

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Answer:

----------------------

Find the hypotenuse using Pythagorean theorem:

If θ is the smallest angle, then opposite side of this angle is the smallest leg, 3 units and therefore adjacent leg is 4 units.

Find cos θ:

The equation of the parabola is (x-3)² = -4(y+4)

Given data ,

Let the equation of the parabola be represented as A

Now , the value of A is

The focus of the parabola is F ( 3 , -7 )

Let the directrix is y = -3

And , y = a ( x - h )² + k

where ( h , k ) is the vertex and ( h , k + p ) is the focus

y is the directrix and y = k – p

(x-3)² = -4y - 16

Multiplying both sides by -1/4, we get:

-(1/4)(x-3)² = y + 4

Subtracting 4 from both sides, we get:

-(1/4)(x-3)² - 4 = y

So the equation of the parabola with focus (3,-7) and directrix y=-4 is:

y = -(1/4)(x-3)² - 4, which is equivalent to (x-3)² = -4(y+4)

Hence , the equation is (x-3)² = -4(y+4)

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The strength of evidence against the null hypothesis depends on the magnitude of the z-score and the significance level. A z-score of 1 is usually not strong enough evidence to reject the null hypothesis because the critical value at common significance levels is usually greater than 1.

The strength of evidence against the null hypothesis depends on the magnitude of the standardized statistic and the significance level chosen for the test.

If the standardized statistic is greater in magnitude than the critical value of the corresponding significance level, then we can reject the null hypothesis in favor of the alternative hypothesis.

The standardized statistic for testing the sample proportion is the

z-score, given by:

z = (p - P0) / sqrt(P0*(1-P0) / n)

where p is the sample proportion, P0 is the hypothesized population proportion under the null hypothesis, and n is the sample size.

Therefore, the magnitude of the z-score determines the strength of evidence against the null hypothesis.

A z-score of 1 is not sufficient evidence to reject the null hypothesis for most significance levels commonly used (e.g., 0.05, 0.01), as the critical value for a two-tailed test at these levels is typically larger than 1.

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The sample space of this probability model is: {HH, HT, TH, TT}.

When flipping a fair coin twice and counting the number of heads, we can represent the outcomes using the terms H (head) and T (tail).

The sample space of this probability model includes all possible outcomes:
First flip is H, second flip is H (HH)
First flip is H, second flip is T (HT)

First flip is T, second flip is H (TH)
First flip is T, second flip is T (TT).

The sample space of this probability model consists of all possible outcomes or combinations of the coin flips.

In this case, we have two coin flips, each of which can result in either heads (H) or tails (T).

Therefore, there are a total of four possible outcomes, which are:

{HH, HT, TH, TT}

where:

HH represents the outcome where both coin flips result in heads

HT represents the outcome where the first coin flip results in heads and the second coin flip results in tails

TH represents the outcome where the first coin flip results in tails and the second coin flip results in heads

TT represents the outcome where both coin flips result in tails

Each of these outcomes is equally likely, assuming the coin is fair, and together they form the sample space of the probability model.

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The correct option is D. Dilate AABC by a scale factor of 2 centred at the origin, then rotate the result 180° about the origin.

In mathematics, dilation is a transformation that changes the size of a geometric figure while preserving its shape. Specifically, dilation involves multiplying the coordinates of each point in the figure by a fixed scale factor, which stretches or shrinks the figure.

Figure ABC has the AC equal to 2 units. After dilation the base XZ will become 4.

The scale factor is calculated as,

Scale factor = 4 / 2

Scale factor = 2

The image is rotated by 180° and the image is vertically opposite side.

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The solution is,

the center of the segment is 1/2- 5/12 = 1/12

Thus the value of "b" is found: it is b =1/12 .

Then the value of "c" is  c =1/2 - 1/12 = 5/12.

Here, we have,

Inequalities represent relationships between two expressions, in which one expression is not necessarily to another. An inequality (x < a, x > a, x ≤ a, x ≥ a) is represented by the following difference expression:

x - a = b   (2)

Where b have the following cases:

If x < a, then b < 0.

If x > a, then b > 0.

If x ≤ a, then b ≤ 0.

If x ≥ a, then b ≥ 0.

The problem asks to find the values "b" and "c" in a way that

the solutions of the equation |x - b| = c are x= 1/2 and x= -1/3.

It means that "b" is the center of the segment [-1/3, 1/2].

This segment has the length 5/6  

Hence, the half of this length is 5/2 .

Therefore, the center of the segment is 1/2- 5/12 = 1/12

Thus the value of "b" is found: it is b =1/12 .

Then the value of "c" is  c =1/2 - 1/12 = 5/12.

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True, the eventual success of any system solely depends on how users work with it.

A system's success is determined by various factors, such as its design, functionality, and compatibility with user needs.

However, user engagement, adaptability, and willingness to work with the system notably contribute to its success.

Users who understand the system's features and can efficiently adapt and utilize them in their workflow contribute to its overall effectiveness.

In contrast, a system with poor user adoption and engagement may not achieve its intended outcomes, regardless of its inherent quality.

So, even if a system is well-designed and has all the necessary features, if users are unable to effectively use it, the system will not achieve its intended purpose.

Thus, user adoption and effective usage are crucial for the success of any system.

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The director may consider collecting more data or conducting a different type of hypothesis test to further investigate the research question.

The human resources director is analyzing the average ages of employees at two different plants (A and B) to determine if there is a significant difference between them. In this scenario, the director obtained a z-value of 1.88 from the statistical analysis.
The z-value, or standard score, indicates how many standard deviations the observed difference in average ages is from the expected difference (which would be zero if there is no actual difference).

To find the p-value, we use the z-value to look up the area under the standard normal distribution curve.
A p-value is the probability of observing a test statistic as extreme or more extreme than the one obtained, assuming the null hypothesis is true.

In this case, the null hypothesis would be that there is no difference in the average ages of employees at the two plants.
With a z-value of 1.88, the p-value will be the area under the curve to the right of 1.88 (for a two-tailed test, since we are looking for a difference in either direction).

Using a z-table or a calculator, we find that the area to the right of 1.88 is approximately 0.0301.

If the p-value is less than α, it indicates that the observed difference in average ages is statistically significant, and the director can conclude that there is a difference in the average ages of employees at the two plants.

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The arc in the circle is given as follows:

Minor arc Arc KLA.

An arc can be classified as either a minor arc or a major arc, depending on it's angle measures, as follows:

The arc for this problem is given as follows:

KLA.

The arc measure is less than half the circumference, that is, less than 180º, hence the arc is classified as a minor arc.

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by simplifying the number by 2 & 4 we get

=> 75:4

=> 37.5:2

=> 18.75:1

the simplest form of the numbers in ratio is 18.75 : 1...

hope this helps u out and Mark the brainliest :)

Based on our analysis, the median remains the same, but the mean is increased. So, the correct answer is (C).

To answer this question, let's consider the impact of the correction on the mean and median separately.

1. Mean: The mean is the sum of all values divided by the number of values. The original mean was calculated as follows:
(Σx)/99 = 24
Σx = 24 * 99

When we correct the maximum value from 40 to 50, the sum of all values changes:
New Σx = (24 * 99) - 40 + 50
New mean = (New Σx) / 99
Since the new sum is greater than the original sum, the new mean will be greater than the original mean.

2. Median: The median is the middle value in a sorted data set. Given that the sample has 99 values and the median was 24.5, it indicates that there are 49 values below 24.5 and 49 above it. The erroneous value (40) must have been one of the 49 values above the median. Correcting it to 50 will not change the position of the median, as it will still have 49 values below and 49 above it. Thus, the median remains the same.

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Answer:

He will use the credit card

Step-by-step explanation:

The question didn't state that he had a debit card

Answer:

x = y = 30°

z = 330°

Step-by-step explanation:

angle x and y are equale by alternate interior angle .

so furst let's find z

z = 360° - 30°

z = 330°

And when we extend the side we create vertical opposite angle and they are equal to 30 and they are equal with x and y so

x = y = 30°

Answer:

Second Option
[tex]\left(\dfrac{1}{6} \right)\cdot t + \left(\dfrac{1}{5} \right)\cdot t = 1[/tex]

Step-by-step explanation:

Shawna can paint the fence in 6 hours. So her rate of work is 1/6 of the fence in one hour

Kevin can paint the same fence in 5 hours so his rate of work is 1/5

Working together their combined rate
= 1/6 + 1/5

Let the time taken for both of them working together to paint the entire fence be t hours

In t hours
amount of work done by each = rate x time
For Shawna:
[tex]\dfrac{1}{6} \cdot t[/tex]

For Kevin:
[tex]\dfrac{1}{5} \cdot t[/tex]

The total work done must add up to the whole fence which can be represented as 1

Therefore the equation for computing the time taken for both of them to work together is given by

[tex]\dfrac{1}{6} \cdot t + \dfrac{1}{5} \cdot t = 1[/tex]

This is the second option

[tex]-------------------------------------------[/tex]

As an aside
While you have not been asked to solve the problem, we can still do it as an exercise:
[tex]\dfrac{1}{6} \cdot t + \dfrac{1}{5} \cdot t = 1\\\\\rightarrow \left(\dfrac{1}{6} + \dfrac{1}{5} \right) \cdot t = 1\\\\\rightarrow \dfrac{11}{30} \cdot t = 1\\\\t = \dfrac{30}{11} = 2 \dfrac{8}{11} \;hours[/tex]

Answer:

Step-by-step explanation:

Answer:

Let's start by assigning variables to the unknowns in the problem. Let x be the number of envelopes that required a 44-cent stamp and y be the number of envelopes that required a 61-cent stamp. We know that the total number of envelopes is 150, so we can write an equation:

x + y = 150

We also know the cost of each type of envelope. If we multiply the number of envelopes by the cost per envelope, we should get the total cost of postage. Using this logic, we can write another equation:

0.44x + 0.61y = 74.50

Now we have two equations with two unknowns. We can solve this system of equations using substitution or elimination. Let's use substitution. Solve the first equation for x:

x = 150 - y

Now substitute this expression for x in the second equation:

0.44(150 - y) + 0.61y = 74.50

Simplify and solve for y:

66 - 0.44y + 0.61y = 74.50

0.17y = 8.50

y = 50

Now that we know y, we can substitute it back into either of the original equations to find x:

x + 50 = 150

x = 100

Therefore, Peter sent 100 envelopes that required a 44-cent stamp and 50 envelopes that required a 61-cent stamp.

Step-by-step explanation:

Answer:

Step-by-step explanation:

1 pound = 16 ounces so we multiply (16 x 33 = 528!!)

C. From a starting position of 3 meters below sea level, the fish is descending 7 meters per second.

The equation of a line is an algebraic form of representing the set of points, which together form a line in a coordinate system.

The general form of the equation of a line is y = mx+b,

where m is the slope (rate of change) and b is the y-intercept (starting position)

In this case, the equation y = -7x - 3 can be used to represent this situation.

Thus, the starting position is 3 meters below sea level (-3) and the fish is descending 7 meters per second (-7).

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Complete Question

A fish is swimming at a constant rate toward the ocean floor. The equation y = -7x - 3 can be used to represent this situation, where y is the depth of the fish in meters below sea level and x is the number of seconds the fish has been swimming.

Which statement best describes the depth of the fish, given this equation?

A. From a starting position of 7 meters below sea level, the fish is descending 3 meters per second.

B. From a starting position of 7 meters below sea level, the fish is ascending 3 meters per second.

C. From a starting position of 3 meters below sea level, the fish is descending 7 meters per second.

D. From a starting position of 3 meters below sea level, the fish is ascending 7 meters per second.

With reference from the table,  the coordinates of the point where the graphs of the equations intersect  is at (0,1).

Therefore Option A is correct.

In the filed of mathematics, the term linear function is described as  two distinct but related notions but in the field of calculus and related areas, a linear function is  described as a function that it's graph is a straight line, in other words is, a polynomial function of degree zero or one.

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The distance between the given points is 31.4 units.

Given are two points (-13, -8) and (6, 17) we need to find the distance between them,

We know that the distance between two points is given by =

[tex]D = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]

Here,

(x₁, y₁) and (x₂, y₂) are (-13, -8) and (6, 17),

So,

[tex]D = \sqrt{(6+13)^2+(17+8)^2}\\\\D = \sqrt{19^2+25^2}\\\\D = \sqrt{986}[/tex]

D = 31.4

Hence the distance between the given points is 31.4 units.

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The solutions to the trigonometry equation tan(2x) = x are x = -5.41, -3.80, -2.14, 0, 2.14, 3.80, and 5.41

From the question, we have the following parameters that can be used in our computation:

tan(2x) = x

To solve the above equation graphically, we start by splitting the above equation/function as follows

y = tan(2x)

y = x

Next, we plot the graphs of y = tan(2x) and y = x on the same coordinate plane

And finally, we then write out the points of intersection

Using the above as a guide, we have the following:

x = -5.41, -3.80, -2.14, 0, 2.14, 3.80, and 5.41

Hence, the solutions to the equation tan(2x) = x are x = -5.41, -3.80, -2.14, 0, 2.14, 3.80, and 5.41

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