Please help, I'm stuck in this math problem

The solution is,  J. The mean and the median both decreased.

The mean can be calculated only for numeric variables, no matter if they are discrete or continuous. It's obtained by simply dividing the sum of all values in a data set by the number of values. The calculation can be done from raw data or for data aggregated in a frequency table.

here, we have,

The amount of money Cole earned for each of six weeks is shown.

$45, $85, $43, $45, $37, $70

i.e. mean = 54.16

now,

Cole then earned $30 for working a seventh week.

so, now, mean = 50.71

i.e. The mean decreased.

Hence, The solution is,  J. The mean and the median both decreased.

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The slope of the line passing through the points (−8, -4) and (−8, 8) is undefined.

The slope of the line passing through the points (3, 4) and (−3, 4) is equal to 0.

In Mathematics, the slope of any straight line can be determined by using this mathematical equation;

Slope (m) = (Change in y-axis, Δy)/(Change in x-axis, Δx)

Slope (m) = (y₂ - y₁)/(x₂ - x₁)

Substituting the given points into the slope formula, we have the following;

Slope (m) = (y₂ - y₁)/(x₂ - x₁)

Slope (m) = (8 - (-4))/(-8 - (-8))

Slope (m) = (8 + 4)/(-8 + 8)

Slope (m) = 12/0

Slope (m) = undefined.

For line B, we have the following;

Slope (m) = (y₂ - y₁)/(x₂ - x₁)

Slope (m) = (4 - 4)/(-3 - 3)

Slope (m) = 0/6

Slope (m) = 0.

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The graph of each function  [tex]f(x)=-x^4+2x^2-2x-3[/tex] is attached below.

Function is a type of relation, or rule, that maps one input to specific single output.

In mathematics, a function is an expression, rule, or law that describes the relationship between one variable (the independent variable) and another variable (the dependent variable) (the dependent variable). In mathematics and the physical sciences, functions are indispensable for formulating physical relationships.

A Linear function is a function whose graph is a straight line

We are given the function;

[tex]f(x)=-x^4+2x^2-2x-3[/tex]

If we know that the function crosses x axis at some point, then for the polynomial functions, we have those as roots of the polynomial.

The graph of each function f(x) is attached below.

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The percent of the pole’s height is the shadow’s length is 66.7%

We know that a 39-foot pole casts a 26-foot shadow. The percent of the pole's height that is the shadow is given by:

P = 100%*(shadow's length)/(pole's height)

Replacing the values that we know, we will get:

P = 100%*(26 feet)/(39 feet)

P = 66.7%

The shadow is a 66.7% of the pole's height.

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Answer:

122 people

Step-by-step explanation:

Let's call the number of people in a vehicle "x".

From the information given, we can set up two equations to represent the relationship between the number of people and the entrance fee:

2 people: 14 = fee

x people: fee = 14x/2

4 people: 20 = fee

x people: fee = 20x/4

8 people: 32 = fee

x people: fee = 32x/8

Using the information for the bus, we can set up another equation:

x people: fee = 122

Solving for x in each equation and equating the results, we can find the number of people in the bus:

x = 14x/2

x = 20x/4

x = 32x/8

x = 122

Cross multiplying and simplifying, we find:

x = 122

Therefore, the bus contains 122 people.

The probability that the next customer will pay with a debit card or a credit card is 98% to the nearest whole number.

The probability of the next customer paying with a debit card or a credit card can be calculated by adding the number of customers that paid with a debit card (30) and the number of customers that paid with a credit card (96) together to get a total of 126. The probability of the next customer paying with a debit card or a credit card is then expressed as a percent by dividing the number of customers that paid with a debit card and a credit card (126) by the total number of customers (131) and then multiplying the answer by 100. This calculation can be expressed as the following formula:

P(debit card or credit card) = (30 + 96) / 131 * 100 = 98%

Therefore, the probability that the next customer will pay with a debit card or a credit card is 98% to the nearest whole number.

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Answer: 96%

Step-by-step explanation:

    To answer this question, we will find the probability that the next customer will pay with a debit card or credit card.

    To do this, we will divide the total number of people who paid with a debit or credit card by the total number of customers.

         [tex]\displaystyle \frac{\text{debit and credit cards}}{{\text{total customers}}} =\frac{30+96}{5+30+96} =\frac{126}{131} =0.961832[/tex]

    Next, we will multiply by 100 to transform the decimal into a percent, then we will round to the nearest whole number.

         0.961832 * 100 = 96.1832% ≈ 96%

Therefore , the solution of the given problem of graph comes out to be x value is  √2.

Scholars use graphs to visually represent or chart facts or values in a logical way. Usually, a graph point will show the relationship of two or more objects. A graph is a non-linear storage structure made up of nodes, also known as vertices, and edges. The nodes, sometimes referred to as vertices, should be joined with glue. Vertices in this graph are 1, 2, 3, and 5, whereas edges are 1, 2, 1, 3, 2, 4, and (2.5). (3.5). (4.5). Graphical depictions of exponential development in statistical charts.

Here,

Given :

=> y =x² -2

To find the value of x :

at y = 0

So,

=> 0 = x² -2

=>x² =2

=>x = √2

Thus, x value is  √2.

Therefore , the solution of the given problem of graph comes out to be x value is  √2.

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The period of oscillation of a spring-block system is most affected by changes in the mass and the spring constant, while changes in the amplitude do not affect the period.

The period of oscillation of a spring-block system is a measure of the time it takes for the block to complete one full cycle of its motion and is dependent on the mass of the block, the spring constant, and the amplitude of the oscillation.

a. If the mass is halved, the system becomes less stiff, and the period of oscillation increases.

b. Doubling the amplitude of the oscillation only changes the magnitude of the displacement and does not affect the period of oscillation.

c. If the spring constant is doubled, the system becomes stiffer, and the period of oscillation decreases.

d. If the mass is doubled, the system becomes more massive, and the period of oscillation increases.

In conclusion, the period of oscillation of a spring-block system is most affected by changes in the mass and the spring constant, while changes in the amplitude do not affect the period.

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The correct question is :

A block attached to a spring with unknown spring constant oscillates with a period of 3.4 s. Parts a to d are independent questions, each referring to the initial situation. What is the period if

a. The mass is halved?

b. The amplitude is doubled?

c. The spring constant is doubled?

d. The mass is doubled?

The time that it will take until Noah and Andre meet is; 2.5 hours

Let t represent the time it would take for Noah and Andre to meet.

Formula to find distance is;

Distance = speed × time

Noah rides at a constant speed of 4 miles per hour. This tells us that the distance that Noah would cover in t hours is expressed as 4t.

Andre rides at a constant speed of 2 miles per hour. This tells us that the distance that Andre would cover in t hours is 2t

Since the total distance is 15 miles, then we can form the equation as;

4t + 2t = 15

6t = 15

t = 15/6

t = 2.5 hours

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The range, given the stem and leaf plot above, can be found to be 33

The range of a data set refers to the difference that is seen between the highest number in that data set and the lowest number in that same set.

The highest number as given in the stem and leaf plot above is 50 and the lowest number is 17.

This means that the range is:

= 50 - 17

= 33

We can therefore conclude that the range for the data set is 33.

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The sequence 3n + 5 because each next term has a constant common difference of 3.

An arithmetic sequence is a set of numbers in which every no. next to the previous number has the same common difference

d = aₙ - aₙ₋₁ = aₙ₋₁ - aₙ ₋₂.

In a geometric sequence numbers are written in the same constant ratio(r).

It means every next number is a multiple of a common constant and the previous number.

r = aₙ/aₙ₋₁ = aₙ-₁/aₙ₋₂.

4. (a). Given, The nth term of a progression is 3n + 5.

Now, Putting some value of 'n' we have,

when n = 1,

a₁ = 8.

when n = 2,

a₂ = 11.

when n = 3,

a₃ = 14.

Now, a₃ - a₂ = a₂ - a₁ = 3.

So, the sequence has a common difference of 3 and hence it is an arithmetic sequence.

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Using the greatest common factor (GCF), to simplify the expression we have: 5(-4a + 2b - 3)

A common factor is either a number or term that is a common denominator to two or more given expressions. Thus can be used to simplify a given expression by factorization.

To factor the simplified expression, we have:

10a + 5b + 3 - 25a + 2b - 18 + 3b - 5a

collect like terms

10a - 25a - 5a + 2b  + 5b + 3b + 3  - 18 = -20a + 10b - 15

So that the positive greatest common factor (GCF) of the simplified expression is 5.

-20a + 10b - 15 = 5(-4a + 2b - 3)

The required answer is 5(-4a + 2b - 3).

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An equation that relates x and y is  y = kx.

A proportional relationship is a relationship between two expressions and where changes in one expression means some constant change in the other expression as well. Generally, it is represented as x/y = k, where x and y are two expressions and k is constant.

Given:

A proportional relationship between x and y.

That means,

x ∝ y.

y = kx, where k is constant.

y/x = k

When y = 72, x = 3.

That means., k = 24.

The equation is y = kx.

Therefore, the equation is y = kx.

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The Correct answers are:

To determine the quantity or percentage of something in terms of 100, use the percentage formula. Per cent simply means one in a hundred. Using the percentage formula, a number between 0 and 1 can be expressed. A number that is expressed as a fraction of 100 is what it is. It is mostly used to compare and determine ratios and is represented by the symbol %.

Given:

We have to find 70% of 42.

So, first Determine 1% of 42, and multiply the result by 70.

= 42 x 0.01 x 70

= 29.4

second, Determine 10% of 42, and multiply the result by 7.

= 42 x 0.1 x 7

= 29.4

Third, Determine 1% of 42, and multiply the result by 7.

= 42 x 0.01 x 7

= 2.94

Fourth, Determine 10% of 42, and multiply the result by 70.

= 42 x 0.10 x 70

= 294

and, the 70% of 42 = 0.7 x 42 = 29.4

Thus, the correct statement are:

Determine 1% of 42, and multiply the result by 70.

Determine 10% of 42, and multiply the result by 7.

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Therefore , the solution of the given problem of unitary method comes out to be  555.09 kWh is  the total energy used.

To finish a work using the unitary strategy, multiply the amount by two after determining the size of the small slice. The unit technique, to put it simply, works to isolate a programming object from a specific group or sets of sets. For instance, 40 pens would cost 400 pounds ($1.01) and Rs. There is a chance that one nation will have complete control over the technique used to do this. Almost all living things have a unique trait. Both integration and reciprocity are possible (mathematics, algebra).

Here,

Given :

For the first 200 kWh, Electric charges $0.09 per kilowatt-hour

For any electricity usage after 200 kWh, the firm charges $0.11 per kilowatt-hour.

Thus ,

for 200kWh hour cost = 0.09 * 200 = $18

thus ,

total bill was after 200 kWh = 57.06 - 18 = 39.06

Thus,

=> 39.06/0.11 = 355.09

Thus , total Kwh used is : 355.09 + 200 = 555.09 kWh

Therefore , the solution of the given problem of unitary method comes out to be  555.09 kWh is  the total energy used .

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Answer:

Step-by-step explanation:

11/3- 6/7 = (77-18)/21

= 59/21

Question 1: 35 m2

Question 2: four hundred forty-four and three-eighths ft2

Question 3: 440 ft2

Question 4: eighty-three and three-fifths in2

Question 5: 124 cm2

Question 6: $1,300.10

Question 7: 24.413 in2

Question 1:

Area of an isosceles trapezoid: (sum of bases x height)/2 = (3 + 7 x 5)/2 = 35 m2

Question 2:

Area of a parallelogram: base x height = 22.5 x 18.75 = 444.375 ft2

Question 3:

Area of the composite figure: (top base x height) + (2 x area of a triangle) = (16 x 22) + (2 x (8 x 4)/2) = 352 + 32 = 384 ft2

Question 4:

Area of the shape for the quilt block: (base x height) + (2 x area of a right triangle) = (10.6 x 6) + (2 x (4 x 5)/2) = 63.6 + 20 = 83.6 in2

Question 5:

Area of a rhombus: (base x height)/2 = (16 x 15.5)/2 = 124 cm2

Question 6:

Cost of waxing the restaurant floor: Area x cost per square foot = (33 x 14) + (19 x 14) + (37 x 28)/2 x $1.67 = 574 + 266 + 506 x $1.67 = $1,300.10

Question 7:

Area of the composite figure: (top base x height) + (2 x area of a triangle) = (4.6 x 3.15) + (2 x (3.3 x 3)/2) = 14.43 + 4.95 = 19.38 in2 + area of a trapezoid = 19.38 + (3.3 + 6.3 x 3)/2 = 19.38 + 12.15 = 24.413 in2

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Answer:

syuprd

Step-by-step explanation:

BASS

By solving a system of equations we will see that:

x = 39

y = 123

First, we know that the sum of the 3 angles on the bottom part should be equal to 180°, then we can write:

(x - 10) + y + (x - 11) = 180

And the angle on the top is a vertical angle to the one that measures y degrees, then:

3x + 6 = y

So we have a little system of equations:

(x - 10) + y + (x - 11) = 180

3x + 6 = y

Replacing the second equation into the first one, we get:

(x - 10) + (3x + 6) + (x - 11) = 180

5x - 15 = 180

5x = 180 + 15

x = 195/5

x = 39

And the value of y is:

3*39 + 6 = y

123 = y

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The correct answer is option C. The system has a nontrivial solution.

One way to determine if a system has a nontrivial solution is to use Gaussian elimination to reduce the augmented matrix to row echelon form. If the row echelon form has a row of zeros except for the last entry in the augmented part, then the system has only a trivial solution.

If there is a row of zeros in the row echelon form that corresponds to a free variable, then the system has a nontrivial solution. In this case, it is possible to use Gaussian elimination to see that the row echelon form of the augmented matrix has a row of zeros except for the last entry in the augmented part, which is not zero, indicating that the system has a nontrivial solution.

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The group with the greatest percent of students is expected to be the one with grades between 70 and 80 (inclusive), since this is close to the mean of 75 and encompasses approximately 68% of the data in a normal distribution (according to the empirical rule).

The empirical rule states that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, approximately 95% falls within two standard deviations, and approximately 99.7% falls within three standard deviations.

So, in this case, grades between 70 and 80 (75 - 5 and 75 + 5) would contain approximately 68% of the students in the course.

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The volume is found using cylindrical shells and rotating the region bounded by xy = 3, x = 0, y = 3, and y = 5 about the x-axis.

To find the volume of the solid obtained by rotating the region bounded by the given curves about the x-axis, we will use the method of cylindrical shells. First, we need to draw the graphs of the functions given. The graph of xy = 3 is a parabola, x = 0 is a vertical line, y = 3 is a horizontal line, and y = 5 is also a horizontal line. The region bounded by these curves is the area between x = 0, y = 3, and y = 5 and xy = 3. Next, we need to find the area of the cylindrical shell. The area of the shell is given by 2πrh, where r is the radius of the circle and h is the height of the shell. The radius of the circle is the distance from the x-axis to the curve, which in this case is x. The height of the shell is the difference between the upper and lower limits of the integral, which in this case is y2 - y1. We can then integrate the area of the shell over the range of x and y values to get the volume. The integral is ∫[0, 3]∫[3, 5]2π(x)(y2 - y1)dxdy. Finally, we can evaluate the integral to get the volume of the solid.

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The subtraction of fraction numbers 4(2/3) and 3(2/5)  is, 19/15

In mathematics, subtraction is an operation which means taking away a few portions of the group or few things from a whole part.

For example, if we take 4 pencils out of 10 then remaining pencils are 6

so this process is called subtraction.

Given that,

Two fraction numbers,

4(2/3)

And 3(2/5)

Subtraction of both the terms = ?

⇒   4(2/3)  - 3(2/5)

Both the numbers can be written in the simplified form as,

⇒   (12 + 2)/3  = 14/3

⇒   (15 + 2)/5  = 17/5

Now, subtracting both the terms,

⇒  14/3 -  17/5

Taking LCM of  3 & 5

LCM(3,5)   = 15

⇒ Now, for making denominator same we multiply and divide each term 14/3 & 17/5 by 5 and  3 respectively,

⇒  (14/3)x(5/5) -  (17/5)x(3/3)

⇒  (14x5)/(3x5)  -  (17x3)/(5x3)

⇒   70/15 - 51/15

Now, denominators are same,

So, it can be written as,

⇒  (70 - 51)/15

⇒   19/15

Hence, the result is 19/15

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Answer:

The probability of not choosing a rose

Step-by-step explanation:

Answer:

yes. sjsksj d djdiodldkdkkdkd

dnsjjs

The function rule for the table is y = -3x - 1

The graph of the functions are attached

y = -7ˣ

y = 3 * 6ˣ

The function in the table is a linear function which is written as

y = mx + c

where

m = slope

c = y intercept'

From the table c = -1

m = (-1 - -4) / (0 - 1) = -3

the function rule is y = -3x - 1

The function y = -7ˣ and y = 3 * 6ˣ are exponential functions

y = -7ˣ

all real numbers is the domain and the range is all real integers less than zero

y = 3 * 6ˣ

all real numbers is the domain and the range is all real integers greater than zero

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The vector shown in figure is, (- 2, 1 , - 4)

Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

We have to given that;

The graph of the vectors is shown below.

Now, By definition of vectors the sign of coordinates are, ( - , + , - )

Thus, By options the coordinate of vectors are,

⇒ (- 2, 1 , - 4)

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A an acute triangle

because all angles are less than 90

Answer: Acute Triangle

Step-by-step explanation:

The P-value for the test is 1.804 and the 95 percent confidence interval on the difference in mean diameter measurements for the two types of calipers is [-0.00147, 0.00347].

a) To determine if there is a significant difference between the means of the population of measurements from which the two samples were selected, we can use a two-tailed t-test. We can calculate the t-statistic as follows:

t = (x1 - x2) / sqrt[((s1^2)/n1) + ((s2^2)/n2)]

where x1 and x2 are the sample means, s1 and s2 are the sample standard deviations, and n1 and n2 are the sample sizes.

For this example, the sample means are x1 = 0.266 and x2 = 0.267. The sample standard deviations are s1 = 0.0017 and s2 = 0.0015. The sample sizes are n1 = 12 and n2 = 12.

Plugging these values into the formula, we get:

t = (0.266 - 0.267) / sqrt[((0.0017^2)/12) + ((0.0015^2)/12)] = -0.145

The critical t-value for a two-tailed test at a significance level of 0.05 with 11 degrees of freedom is 2.201. Since our calculated t-value of -0.145 is not greater than the critical t-value, we can conclude that there is not a significant difference between the means of the population of measurements from which the two samples were selected.

b) The P-value for the test in part (a) is the probability of obtaining a test statistic as extreme as the one we calculated (or more extreme) if the null hypothesis is true. We can calculate this probability as follows:

P = 2 * P(t <= -0.145)

where P(t <= -0.145) is the cumulative probability of the t-distribution with 11 degrees of freedom at -0.145.

Using the t-distribution table, the cumulative probability of t at -0.145 is 0.902. Thus, the P-value for the test in part (a) is P = 2 * 0.902 = 1.804.

c) To construct a 95 percent confidence interval on the difference in mean diameter measurements for the two types of calipers, we can use the following formula:

CI = [x1 - x2 +/- t(alpha/2, df) * sqrt[((s1^2)/n1) + ((s2^2)/n2)] ]

where x1 and x2 are the sample means, s1 and s2 are the sample standard deviations, n1 and n2 are the sample sizes, and t(alpha/2, df) is the critical t-value for the two-tailed test at a significance level of alpha/2 with df degrees of freedom.

For this example, the sample means are x1 = 0.266 and x2 = 0.267. The sample standard deviations are s1 = 0.0017 and s2 = 0.0015. The sample sizes are n1 = 12 and n2 = 12. The critical t-value for a two-tailed test at a significance level of 0.025 with 11 degrees of freedom is 2.771.

Plugging these values into the formula, we get: CI = [0.266 - 0.267 +/- 2.771 * sqrt[((0.0017^2)/12) + ((0.0015^2)/12)] ] = [-0.00147, 0.00347]

Thus, the 95 percent confidence interval on the difference in mean diameter measurements for the two types of calipers is [-0.00147, 0.00347].

The results of the two-tailed t-test show that there is not a significant difference between the means of the population of measurements from which the two samples were selected. The P-value for the test is 1.804 and the 95 percent confidence interval on the difference in mean diameter measurements for the two types of calipers is [-0.00147, 0.00347].

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To determine the magnitude and direction of the resultant force applied at b, we can use vector addition of the tensions in cables AB and BC. Let's assume that the positive x-direction is to the right, and the positive y-direction is upwards.

We can represent the tension in cable AB as a vector T1 = 4500 lb in the direction of AB, and the tension in cable BC as a vector T2 = 2000 lb in the direction of BC.

The magnitude of the resultant force applied at b is given by:

R = √(T1^2 + T2^2) = √(4500^2 + 2000^2) = 5000 lb

The direction of the resultant force can be found using the arctangent function:

θ = tan^-1 (T2/T1) = tan^-1 (2000/4500) = approximately 39.2 degrees

Therefore, the magnitude and direction of the resultant force applied at b are 5000 lb and 39.2 degrees, respectively.

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Let $abcd$ and $bedf$ be two $2 \times 3$ rectangles that overlap, the area of the overlap is 6 square unit.

The quantity of space occupied by a flat surface with a specific form is referred to as the area. It is calculated as a "number of" square units.

Given that we have to assume to rectangles

ABCD and BEDF

both have dimensions 2×3.

So the area of rectangles-

A=2(3)=6 square unit

Also given that both the rectangles overlap each other.

Since both the rectangle are of the same dimension so the overlapping area will be equal to their original area.

So the area of overlap- A=6 square unit.

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