MATHEMATICS MIDDLE SCHOOL

Who else hates online learning

Answers

Answer 1
Answer:

Answer:

meee

Step-by-step explanation:
Answer 2
Answer:

Answer:

omg who dosent

Step-by-step explanation:

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Please I need help can someone help me it’s urgent

Answers

Answer:

When the numbers are giving us magnitude relative to a fixed point.

Step-by-step explanation:

In cases where the sign of the numbers are just telling us magnitude.

For instance the sign of the slope tells whether the line moves forward or backward.

But when we are considering the steepness of the line, it makes sense if we compare the absolute value of the numbers.

The greater the absolute value, the greater the steepness.

Also distance below or above sea level.

What is the probability of tossing two coins and having them both land on heads?

Answers

the probability is 1/2 .there are two coins. it depends on how many times you throw the coins the probability to this answer could be anything really...

Answer:

the probability is 1/2 .there are two coins. it depends on how many times you throw the coins the probability to this answer could be anything really.

Step-by-step explanation:

The distance from a driveway to the closest house is 12,672 feet. How far is that in miles?A) 2.2 miles
B) 2.4 miles
C) 4.2 miles
D) 12 miles

Answers

The answer is B.2.4 miles
The distance is 2.4 Miles

What is 4 7/8 written as an improper fraction?

Answers

39/8. When you change this to an improper fraction, that is what you get.
4x8+7=39 so fraction is 39/8

Given ~ and AB = 20, CA = 8, and US = 9, what is ST?
Does anyone know?

Answers

ST would be 22.5. 
Assuming ΔABC and ΔSTU are similar, they have to be proportional, so you could create a proportion to figure it out: 8/20=9/? (if you need to know how I got that, message me). Then you could cross multiply. 9x20 is 45, so that means that the measure of ST times 8 has to equal 45. If you divide 45 by 8, you get 22.5, so that makes the measure of ST 22.5.
(Sorry if that was confusing, I can always take a picture of my work if you need further explanation)

Arm Span(x) Height(y) (58, 60)
(49, 47)
(51, 55)
(19, 25)
(37, 39)
(44, 45)
(47, 49)
(36, 35)
(41, 40)
(46, 50)
(58, 61)
(67, 63)

1. Representation of Data with Plots Using graphing software of your choice, create a scatter plot of your data. Predict the line of best fit, and sketch it on your graph. Copy and paste your scatter plot into a word processing document.

2. The Line of Best Fit Include your scatter plot and the answers to the following questions in your word processing document:

Which variable did you plot on the x-axis, and which variable did you plot on the y-axis? Explain why you assigned the variables in that way.

Write the equation of the line of best fit using the slope-intercept formula y = mx + b. Show all your work, including the points used to determine the slope and how the equation was determined.

What does the slope of the line represent within the context of your graph? What does the y-intercept represent?

Test the residuals of two other points to determine how well the line of best fit models the data. Use the line of best fit to help you to describe the data correlation.

Using the line of best fit that you found in 2, approximate how tall is a person whose arm span is 66 inches?

According to your line of best fit, what is the arm span of a 74-inch-tall person?

Answers

Answer:

Here's what I get.

Step-by-step explanation:

1. Representation of data

I used Excel to create a scatterplot of the data, draw the line of best fit, and print the regression equation.

2. Line of best fit

(a) Variables

I chose arm span as the dependent variable (y-axis) and height as the independent variable (x-axis).

It seems to me that arm span depends on your height rather than the other way around.

(b) Regression equation

The calculation is easy but tedious, so I asked Excel to do it.

For the equation y = ax + b, the formulas are

a = (\sum y \sum x^(2) - \sum x \sumxy)/(n\sum x^(2)- \left (\sum x\right )^(2))\n\nb = (n\sumx y - \sum x \sumxy)/(n\sum x^(2)- \left (\sum x\right )^(2))

This gave the regression equation:

y = 1.0595x - 4.1524

(c) Interpretation

The line shows how arm span depends on height.

The slope of the line says that arm span increases about 6 % faster than height.

The y-intercept is -4. If your height is zero, your arm length is -4 in (both are impossible).

(d) Residuals

\begin{array}{cccr}&\textbf{Arm Span} & \textbf{Arm Span}&\n\textbf{Height/in} &\textbf{Actual} & \textbf{Predicted}&\textbf{Residual}\n25 & 19 & 22.3 & -3.3\n40 & 41 & 38.2 & 2.8\n55 & 51 & 54.1 & -3.1\n65 & 67 & 62.6 & 4.4\n \end{array}

The residuals appear to be evenly distributed above and below the predicted values.

A graph of all the residuals confirms this observation.  

The equation usually predicts arm span to within 4 in.

(e) Predictions

(i) Height of person with 66 in arm span

\begin{array}{rcl}y& = & 1.0595x - 4.1524\n66 & = & 1.0595x - 4.1524\n70.1524 & = & 1.0595x\nx & = & (70.1524)/(1.0595)\n\n& = & \textbf{66 in}\n\end{array}\n\text{A person with an arm span of 66 in should have a height of about $\large \boxed{\textbf{66 in}}$}

(ii) Arm span of 74 in tall person

\begin{array}{rcl}y& = & 1.0595x - 4.1524\n& = & 1.0595*74 - 4.1524\n& = & 78.4030 - 4.1524\n& = & \textbf{74 in}\n\end{array}\n\text{ A person who is 74 in tall should have an arm span of $\large \boxed{\textbf{74 in}}$}
Other Questions
Need help on question 9
Is 7/8 less than greater than or equal to 3/4
sharonas age is at most 3 more than twice kaylas age. if sharona is 35 years old, write an inequality that best represents the situation, where a represents kaylas age.
Whats 30+30×b=100 please