a boat travels upstream for 36 miles in 4 hours and returns in 3 hours traveling downstream in a river. what is the rate of the boat in still water and the rate of the current?

The calculation of the separation between two locations on a plane is done using the Euclidean distance formula. This equation estimates the separation between two places.

[tex]d = \sqrt{(x_{2} - x_{1} )^{2} + (y_{2} - y_{1} )^{2} }[/tex]

Our perception of space is frequently incorrect in high dimensions since it was created in two and three dimensions. Think about randomly distributing 100 points into a unit square. The range [0, 1] is used to produce each coordinate independently and evenly at random.

Choose a point, calculate the distances between it and every other point, and then chart the distribution of those distances. The points are then uniformly generated at random in a 100-dimensional unit cube when the dimension is increased. Around an average distance, the distribution of distances becomes concentrated.

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The effective tax rate for a taxable income of $63,42 using the marginal tax rate chart rounded to the nearest hundredth is 15.18%.

The correct answer option is option C

Income = $63,425 and marginal rates

Find tax payable amount:

Amount taxable = $10275 -$0

= $10275

Tax payable = 10% of 10275

= 0.1 × 10275

=$1027.5

Amount taxable = $41,175 - $10,276

= $30899

Tax payable = 12% of 30899

= 0.12 × $30899

= $3707.88

Amount taxable = $89,075 - $41,176

= $22249

Tax payable = 22% of 22249

= 0.22 × $22,249

= $4894.78

Total tax payable amount = $10275 + $3707.88 + $4894.78

= $9630.16

Effective tax rate = (Total tax payable amount/ income) × 100

= ($9630.16 / $63,425) × 100

= 15.18%

Therefore, the effective tax rate for a taxable income of $63,425 is 15.18%.

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Ted used a balance scale to weigh a 2.233 g sample of copper sulfate,  the most accurate measurements made by Ted is 2.2 g.

Accuracy is a measure of how close you are the true value.  

In this case,Ted used a balance scale to weigh a 2.233 g sample of copper sulfate using only 2 significant figures, that would be the value of 2.2 g

Precision is how close a test result when repeated. In precision, the actual value is not examined. You only need to look at the result.The standard deviation should be small.

Accuracy is how close the test results to the standard known value. The standard deviation might be big.

Ted used a balance scale to weigh a 2.233 g sample of copper sulfate,  the most accurate measurements made by Ted is 2.2 g.

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Answer:

C. 37

Step-by-step explanation:

2 + (7x5)

= 2 + (35)

= 2 + 25

= 37

Answer: 37

Step-by-step explanation:

Following PEMDAS* we then get 2+35. Adding that we will get 37.

*(Parenthesis, exponents, multiplication, division, addition, subtraction )

If 17 is the middlie number in a series when it is arranged either in ascending or decending order, then 17 is the median number

The median is the middle number in an ordered data set. The mean is the sum of all values divided by the total number of values.

Arrange the data points from smallest to largest or from largest to smallest. If the number of data points is odd, the median is exactly the middle data point in the list. If the number of data points is even, then the median is the average of the two middle data points in the list.

Therefore, if 17 is the middlie number in a series when it is arranged either in ascending or decending order, then 17 is the median number

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Answer:

[tex]7-8x+4y=-21[/tex]

Step-by-step explanation:

[tex]2x-y=7 \implies 8x-4y=28 \\ \\ \implies 7-8x+4y=7-28=-21[/tex]

The ordered pair (4, 0) makes both inequalities true.

What is inequality?

An inequality in mathematics depicts the connection between two values in an algebraic statement that are not equal. One of the two variables on the two sides of the inequality may be greater than, greater than or equal to, less than, or less than or equal to another value, according to inequality signals.

In inequality, we compare two values.

y < 3x -1 …. (1)

y > -x + 4 …. (2)

Take the point (4, 0)

Consider inequality (1)

y < 3x-1

0 < 3 (4) - 1

0 < 12 - 1

0 < 11 which is true

In inequality (2)

y ≥ - x + 4

0 ≥ -4 + 4

0 ≥ 0 …. Which is true

Therefore, the ordered pair (4, 0) makes both inequalities true.

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Question:

Which ordered pair makes both inequalities true? y < 3x – 1 y > –x + 4

(4,0) (1,2) (0,4) (2,1)

Answer:

A its A

Step-by-step explanation:

Answer:

x= 37 , y= 143

Step-by-step explanation:

okay so to start out we must write an equation in order to find the angles of a parallelogram.

2x+2y=360 (the angles of a parallelogram always equal 360 degrees)

next, since we know that the angle for y is "y+3" we can substitute this into the equation

2x+2(y+3)=360

next, since it is given that y=3x+29 we can now substitute that into the equation

2x+2[(3x+29)+3]=360

now, SOLVE!

[tex]2x+2[(3x+29)+3]=360 \\2x+2(3x+32)=360 \\2x+6x+64=360\\8x+64=360\\8x=296\\x=37[/tex]

okay, now we know that x=37 degrees so now we must find y. this can be done by substituting 37 into (3x+29)+3 or simply, 3x+32

[tex]y=3x+32\\y=3(37)+32\\y=111+32\\y=143[/tex]

don't forget to check your work!

2(37)+2(143)=360

there you go! so x= 37 degrees and y= 143 degrees

The diagonal of a cube increasing at a rate of 31.869 cm/s.

It is given that edges are increasing at a rate of 18.4 cm/s.

We know the formula of diagonal of cube which is

D = [tex]\sqrt{3}[/tex] a

where a is the edge.

Now we will differentiate the diagonal equation with respect to time er get,

[tex]\frac{dD}{dt}[/tex] = [tex]\sqrt{3}[/tex] [tex]\frac{da}{dt}[/tex]

Given that edges are increasing at a rate of 18.4 cm/s, this means

[tex]\frac{da}{dt}[/tex] = 18.4 cm/s

Therefore

[tex]\frac{dD}{dt}[/tex] = [tex]\sqrt{3}[/tex] (18.4) cm/s

[tex]\frac{dD}{dt}[/tex] = 1.732(18.4) cm/s

[tex]\frac{dD}{dt}[/tex] = 31.869 cm/s

Hence the diagonal of a cube increasing at a rate of 31.869 cm/s.

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A ratio displays the multiplicity of two numbers, the total number of employees is 187.

The ratio can be defined as the number that can be used to represent one quantity as a percentage of another. Only when the two numbers in a ratio have the same unit can they be compared.

Ratios contrast two figures by ordinarily dividing them. A/B would be your formula if you were going to compare one data point (A) to another data point (B). This indicates that you are multiplying data A by data B.

So the ratios are-

men : women

4:7

x:119

Now, relationship between 7and 119 is -

men : women

4:7

7*17

x:119

Now,

men : women

4:7

4*17 :7*17

68:119

Total number

68+119= 187

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The remainder when x² + 2x + 1 is divided by x + 1 is 0.

Given,

The polynomial functions; x² + 2x + 1 and x + 1

We have to find the remainder when x² + 2x + 1 is divided by x + 1

Remainder theorem;-

Remainder Theorem is a method for dividing polynomials according to Euclidean geometry. This theorem states that when a polynomial P(x) is divided by a factor (x - a), which isn't really an element of the polynomial, a smaller polynomial is produced along with a remainder.

Here,

p(x) =  x² + 2x + 1

g(x) = x + 1

Now,

x + 1 = 0

x = -1

Then,

p(-1) =  -1² + 2 x -1 + 1 = 1 - 2 + 1 = - 1 + 1 = 0

That is,

The remainder when x² + 2x + 1 is divided by x + 1 is 0.

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6 orders of the conditions are possible in dr. davis's study.

What is an independent variable?

What it means to be an independent variable is exactly what it is. It is a variable that is independent of the other factors you are attempting to assess. Age is just one example of an independent variable.

What distinguishes a variable from a dependent one?

The cause is the independent variable. The other factors in your study have no bearing on its value.

                      Effect is the dependent variable. The independent variable's changes determine its value.

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For the given experiments , participants concluded that complexity is more on the random patterns on every trials compare to  one segment that was same for every trial.

As given in the question,

Steps for the experiment where participants manually tracked a complex pattern which consists of two segments are as follow:

In first case : One segment consists of random patterns on every trial that is on every new trial there is new random pattern which participant has to follow.

In second case : Another segment consists of same pattern on every new trial.

After conducting experiment reports conclude that repeated segment with the same pattern present more improved result compare to random patterns. As participants were aware of the same segment on each new trial.

Therefore, given experiments of participants proves the complexity is more on the random patterns on every trials compare to one segment  same for every trial.

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Answer:

18 ÷ 2/3 = 27

-5/6 ÷ 9/10 = -0.925

It is proved that every natural number can be expressed as the sum of distinct powers of 2 using strong induction.

Natural numbers are those in mathematics that are utilized for counting and ordering. Cardinal numbers are those used for counting, while ordinal numbers are those used for ranking. The positive integers, also referred to as non-negative integers, are a subset of the natural numbers. A few examples are 1, 2, 3, 4, 5, 6,.... In other words, the set of all whole numbers other than 0 (i.e., 23, 56, 78, 999, 100202, etc.) is known as the natural numbers.

Here,

The statement is obviously true for n=0.

Assume that we are given an n≥1 and that it is true for all m with 0≤m<n.

When n=2^m then m<n and therefore m=∑k2^pk with finitely many pk, all of them different. It follows that n=∑2^(pk+1) with all pk+1 different.

When n=2^(m+1) with an m as before then n=2^0+∑k2^(pk+1) with all pk+1 different and different from 0.

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The required greatest difference between the estimate and the true value is 45.

Given that,
Ethan needs to add together two whole numbers and wants to estimate the answer first. He rounds both numbers to 1 significant figure, which gives him 300 and 600 and adds them together to get an estimate of 900.

The rounding of values is superseding a number with an inexact value that has a more ephemeral, more uncomplicated, or more direct representation.

Here,
For the estimated number 900, the least number that can be rounded to the number 900 is 855,
Now,
Difference  = 900 - 855 = 45

Thus, the required greatest difference between the estimate and the true value is 45.

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By plotting the obtained solutions on the graph we get graph as below.

The given system of inequalities are y >2x²+x-3 and y <-x² + 5x.

Inequalities are the mathematical expressions in which both sides are not equal. In inequality, unlike in equations, we compare two values. The equal sign in between is replaced by less than (or less than or equal to), greater than (or greater than or equal to), or not equal to sign.

Put x=0, 1, 2 and 3 in the given inequalities, we get

Now, with y >2x²+x-3

When x=0

y >2(0)²+0-3

y >-3

When x=1

y >2(1)²+1-3

y >0

When x=2

y >2(2)²+2-3

y >7

When x=2

y >2(3)²+3-3

y >18

With the inequalities y<-x²+5x

When x=0

y<-0²+5(0)

y<0

When x=1

y<(-1)²+5(1)

y<6

When x=2

y<(-2)²+5(2)

y<14

When x=3

y<(-3)²+5(3)

y<24

By plotting the obtained solutions on the graph we get graph as below.

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The mean boxes that were sold is 16 when Alice wants to know the average number of candy boxes she sells at the baseball game.

Given that,

Alice wants to know the average number of candy boxes she sells at the baseball game. Below is a list of the scores from the games so far. 16,14,14, 21,15.

We have to find the mean boxes that were sold.

We know that,

The mean of the number is

16,14,14, 21,15

Mean = 16+14+14+21+15/5

Mean = 80/15

Mean=16

Therefore, The mean boxes that were sold is 16 when Alice wants to know the average number of candy boxes she sells at the baseball game.

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Answer: Northeast - unless you are at the South Pole, in which case you are still facing North.

Step-by-step explanation

Sequence:

Facing North

90 degrees left = facing West

180 degrees right = facing East

reverse = facing West

45 degrees left = facing Southwest

reverse = facing Northeast

The answer is g(f(x)) =(x+6)(x+2)

From the question, we have

f(x) = x + 3 and g(x) = x² + 2x - 3

g(f(x)) = g(x + 3)

=(x + 3)² + 2(x + 3) - 3

=x² + 9+6x+2x+6-3

=x² + 8x+12

=x² + 6x+2x+12

=(x+6)(x+2)

The answer is g(f(x)) =(x+6)(x+2)

Multiplication:

Mathematicians use multiplication to calculate the product of two or more numbers. It is a fundamental operation in mathematics that is frequently utilized in everyday life. When we need to combine groups of similar sizes, we utilize multiplication. The fundamental concept of repeatedly adding the same number is represented by the process of multiplication. The results of multiplying two or more numbers are known as the product of those numbers, and the factors that are multiplied are referred to as the factors. Repeated addition of the same number is made easier by multiplying the numbers.

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The probability that a pupil uses neither pool nor gym is 11/70

Probability is the likelihood that an event will happen. This can range from an event being impossible to some likelihood to being absolutely certain. In math terms, probability is on a scale from 0 to 1. Zero means the event is impossible, like rolling a seven on a die that only has digits from 1 to 6.

Number of pupil that can use pool and gym = 28

Number of people that can use pool = 48

Number of people that can use gym = 39

Number of people that can use pool only = 48 - 28 which is 20

Number of people that can use gym only = 39 - 28 = 11

Total number of persons that can use either pool, gym or both = 20 + 11 + 28 which is 59

Number of people that cannot use either or both of the facilities = 70 - 59 which is 11.

Probability = required outcome / possible outcome

Required outcome = 11

possible outcome = 70

Probability = 11/70

In conclusion, the probability that a pupil uses neither swimming pool nor gym is 11/70

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The rectangular equation is y = x² - 8.

Given;

The rectangular equation to sketch the plane curve represented by the given parametric equations,

x = √3t

y = 3t - 8              -∞ < t < ∞

Now,

3t = x²

t = x²/3

Now,

y = x² - 8

Therefore, the rectangular equation is y = x² - 8

Where, x ≥ 0

And the graph is a curve as shown below,

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The probability that x is between 420 and 460 is 0.25778

The sum of independent normally distributed random variables is normally distributed with mean equal to the sum of the individual means and variance equal to the sum of the individual variances.

so, the mean would be,

μ = 100 + 150 + 200

μ = 450

and standard deviation would be,

σ = 15+ 20 + 25

σ = 60

We need to find the probability that x is between 420 and 460.

P(420 < x < 460)

= P( 420 -  μ < x -  μ < 460 -  μ)

= P((420 -  μ)/σ < (x - μ)/σ < (460 -  μ)/σ)

= P((420 -  450)/60 < Z < (460 -  450)/60)

= P (-1/2 < Z < 1/6)

= P(-0.5<x<0.167)

= 0.25778

Therefore, the probability is P(420 < x < 460) = 0.25778

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The required read time taken by the John in the given question is 2 hours.

A ratio can be characterized as the relationship or examination between two quantities of a similar unit to check how greater is one number than the other one.

Sasha read = 2(mike  read)

given, mike read 5 hours

Then, Sasha = 10 hours

Similarly,

Tom read = (Sasha read)2/5

Tom read = 4 hours

Now, john read = (Tom read)/4 = 4/2

John read = 2 hours

Thus, read time of John is 2 hours.

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Answer: direct variation, slope-intercept form, standard form and point-slope form.

Step-by-step explanation:

What are the types of linear functions?

There are three major forms of linear equations: point-slope form, standard form, and slope-intercept form.

What are basic linear functions?

Linear functions are those whose graph is a straight line. A linear function has the following form. y = f(x) = a + bx. A linear function has one independent variable and one dependent variable. The independent variable is x and the dependent variable is y.

Answer:

It is data outside what you would expect.

Step-by-step explanation:

An example would be if I asked everyone is a class how many dogs they dad living with them.  I would expect to get answers like 0, 1, 2, 3 or 4.  If someone answered 115 that would be be an outlier, it is outside all of the data that I have collected.

The probability of selecting a three and then selecting a five is 0.6%

Probability is a branch of mathematics that deals with numerical descriptions of how likely an event or statement is to occur.

Probability is computed by dividing the number of possible outcomes by the total number of possible outcomes. Probability and odds are two distinct ideas. Odds are calculated by dividing the probability that something will occur by the probability that it will not occur.

Because there are four threes in the deck, the probability of picking one is 4/52.

Then, for the second draw, there are four fives as well, but because you already chose a card and did not replace it, there are only 51 cards in the deck, therefore the likelihood of drawing a five is 4/51.

The product of the two individual probabilities is the likelihood of both events occurring.

So,

(4/52) × (4/51)= 16/2652

= 4/663

= 0.6%

Hence,  the probability of selecting a three and then selecting a five is 0.6%

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The weightage is given to the most recent values in the time series.

SES is a simple forecasting technique that is easy to implement and can be used with data that has a consistent trend. However, it is not well suited for data that is highly volatile or has a lot of noise.

One of the simplest forecasting techniques is single exponential smoothing (SES). It is a weighted average of past time-series values, where the weightage is given to the most recent values in the time series. This technique is easy to implement and can be used with data that has a consistent trend. However, it is not well suited for data that is highly volatile or has a lot of noise.

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The physiological responses that occur in response to low blood levels of calcium are bones release calcium into the blood, the kidneys retain more calcium, intestines absorb more calcium

Calcium is a chemical element which plays an important role in building and maintaining strong bones. It also plays other significant roles in blood clotting, muscles contraction, and normal heart rhythms regulation, and nerve functions. Calcium ions are essential in several cellular processes and the body tightly regulates calcium levels within a narrow physiological range as relatively small changes can have dramatic effects, including heart failure, muscle and brain dysfunction, and even death. Blood calcium levels are regulated by parathyroid hormone (PTH), produced by the parathyroid glands. PTH is released in response to low blood calcium levels and improves calcium levels by targeting the skeleton, the kidneys, and the intestine. The physiological responses that occur in response to low blood levels of calcium are bones release calcium into the blood, the kidneys retain more calcium, intestines absorb more calcium

Note: The question is incomplete as it is missing options which are a) liver releases calcium into the blood. b) bones release calcium into the blood. c) kidneys retain more calcium. d) intestines absorb more calcium.

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The required third number of the given triad is 16.

The average is characterized as the mean worth which is equivalent to the proportion of the amount of the quantity of a given arrangement of values to the complete number of values present in the set.

Given two number are 17 and 24.

Let the third number is x,

Average of three number is 19

17 + 24 + x/3 = 19

41 + x = 57

x = 16

Thus, the third number is 16.

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