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3 years ago

Which property of addition is shown? 2+4=4+2 associative commutative identity

Mathematics

2 answers:

sergejj [24]3 years ago

8 0

2+4=4+2 is an example of commutative property of addition

Effectus [21]3 years ago

4 0

Answer:

Commutative, Identity

Step-by-step explanation:

Commutative means that when you add or multiply you have the same answer and it doesn't matter what order you multiply in.

Associative deals with parenthesis.

Identity is when both sides of the equation are the same.

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6(7x=8) + 6 = -168 solve variable

Rus_ich [418]

Answer:

1/3 ?

Step-by-step explanation:

im sorry its probably wrong, delete this if it is.

5 0

3 years ago

Cherry is a realtor. She made the graph below to show the amount of taxes paid on the houses she has sold. Which of the followin

BlackZzzverrR [31]

It increased by 3000$ for every 200,000$ increased in appraised value. Hope this helps❤️please rate

5 0

3 years ago

Help me please this is for a math test. <br> Thank you

zubka84 [21]

Answer:

x + 3y = -12

Step-by-step explanation:

y = mx + b

m is the slope = rise / run:

rise = 1

run = 3

the line is downhill so its negative

m = - 1 / 3

b is the y intercept which is when the line cross over the y axis: - 4

y = - 1/3x - 4

multiply both sides by 3

3y = -1x - 12

add x to both sides

x + 3y = -12

7 0

1 year ago

Weight of a rock: In a geology course, students are learning to use a balance scale to accurately weigh rocks. One student plans

statuscvo [17]

Answer:

The student who weighted the rock 5 times has a 95% confidence interval of (25.2, 29.1) which is guaranteed to be more wider (less precise) than the other student who weighted the rock 20 times.

Step-by-step explanation:

What is Confidence Interval?

The confidence interval represents an interval that we can guarantee that the target variable will be within this interval for a given confidence level.

The confidence interval is given by

$CI = \bar{x} + t_{\alpha/2}(\frac{\sigma}{\sqrt{n} } ) \\$

Where $\bar{x}$ is the mean weight $\sigma$ is the standard deviation $t_{\alpha/2}$ is the critical value from t-table and n is the sample size.

The term $t_{\alpha/2}(\frac{\sigma}{\sqrt{n} } )$ is known as margin of error.

As the sample size is decreased the corresponding margin of error increases which results in wider confidence interval which means smaller precision.

The student who weighted the rock 5 times has a 95% confidence interval of (25.2, 29.1) which is guaranteed to be more wider (less precise) than the other student who weighted the rock 20 times.

We can say with 95% confidence that the true mean weight of the rock is within the interval of (25.2, 29.1).

7 0

3 years ago

Evaluate 3x2 - 1 when x = 2.

Shalnov [3]

Answer:C or 11

Step-by-step explanation:

3x²-1

First you insert x... which is 2

3(2)²-1

then you square the 2. (multiply it by itself)

3(4)-1

Then you multiply 3 by 4 to get 12

12-1

And then you subtract for your answer

4 0

3 years ago