Which equation shows the
commutative property of addition?
A 2x = 2x
B 2x + 3 = 3 + 2x
C 2x - 3 = 2(x - 3)
D 2(x + 3) = 2x + 6

Answers

Answer 1

Answer:

B

Step-by-step explanation:

Have a nice day!

Answer 2
The answer is B since you can add in any order with those numbers

Related Questions

A metal bar weighs 9.65 ounces. 78% of the bar is Gold. How many ounces of
Gold are in the bar? (round to the nearest thousandths)

Answers

Answer: 7.527 oz

Step-by-step explanation: 78%= 0.78

Mass of gold is 0.78 · 9.65 oz = 7.527 oz

It takes Paul 9 hours longer than Li Ming to paint a house. Working together they can do the job in 20 hours. How long would it take Li Ming, working alone, to paint the house ?

Answers

Li Ming can paint the whole house in 10 hours

B
130 ft
10°
19°
A
D

Answers

What?? U didn’t attach a photo

Find the degree of the polynomial – 3x + x² +3.​

Answers

Answer:

Step-by-step explanation:

Degree means highest exponent.  got it?

I believe the answer is: 2

Hope this helps :)

A 20-question multiple choice quiz has five choices for each question. Suppose that a student just guesses, hoping to get a high score. The teacher carries out a hypothesis test to determine whether the student was just guessing. The null hypothesis is p = 0.20, where p is the probability of a correct answer.

a. Which of the following describes the value of the z-test statistic that is likely to result? Explain your choice.

i. The z-test statistic will be close to 0.
ii. the z-test statistic will be far from 0.

b. Which of the following describes the p-value that is likely to result? Explain your choice.

i. The p-value will be small.
ii. The p-value will not be small.

Answers

Answer:

a)  i. The z-test statistic will be close to 0, as the sample mean and the tested proportion are expected to be close values.

b)  ii. The p-value will not be small, as the z-statistic is close to 0.

Step-by-step explanation:

The null hypothesis is p = 0.20

The teacher carries out a hypothesis test to determine whether the student was just guessing.

Test if the proportion is different from 0.2. So the alternate hypothesis is:

[tex]H_{a}: p \neq 0.2[/tex]

Five choices for each question, one of which is correct.

Probability of having a correct answer is [tex]X = \frac{1}{5} = 0.2[/tex]

The test statistic is:

[tex]z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]

In which X is the sample mean, [tex]\mu[/tex] is the value tested at the null hypothesis, [tex]\sigma[/tex] is the standard deviation and n is the size of the sample.

a. Which of the following describes the value of the z-test statistic that is likely to result?

In this question, [tex]X = p = \mu[/tex], which meas that the numerator of the z-statistic will be close to 0, which means that the z-test statistic will be close to 0.

b. Which of the following describes the p-value that is likely to result?

pvalue is 2 multiplied by the pvalue of Z(if negative), or 1 subtracted by the pvalue of Z(if positive).

Since the value of Z is close to 0, either the pvalue of Z or 1 subtracted by the pvalue of Z is close to 0.5, and multiplied by 2 will be close to 1. So, as Z is close to 0, the pvalue will not be small.

Two intersecting segments form the diagonals of a quadrilateral. What additional information do you need to know about the diagonals to prove that a quadrilateral is a parallelogram

Answers

Answer:

B. They must bisect each other

Step-by-step explanation:

Found the answer on quizziz

Solve the system of equations by finding the reduced row-echelon form of the augmented matrix for the system of equations.
x + y - z = -2
2x - y + 3z = 9
x - 4y - 2z = 1

Answers

Answer:

8

Step-by-step explanation:

k

Find the probability

Answers

Answer:

33.3333%

Step-by-step explanation:

each side would be 50% and if one side is split between three it would equal if it was 16.6667 each

since tehre are two red sides multiply 16.6667 by 2 and u get 33.3333%

HELP ASAP A factory makes car batteries. The probability that a battery is defective is is.
If 400 batteries are tested, about how many are expected to be defective?
A. 25
B. 40
C. 16
D. 375

Answers

375 is the ansewer   wwrhttttttttttttttttttt

Answer:

25

Step-by-step explanation:

If I get 9 books for $36 of much does one cost

Answers

$36 / 9 = $4
One book costs $4.00.

Help,,,,,,,,,,,,,,,........

Answers

B= 0.5
Because it’s right after A which is 0

Find the value of x. Round to the
nearest tenth.
х
33
6

Answers

Answer:

cos(33) = 6/X

cos(33)*6= X

X= 5.03202340767254

rounded to the nearest tenth it is 5

therefore X= 5

The value of x in the given digram using trigonometry to the nearest tenth is 7.15.

What is the value of x ?

The given image is a right triangle. A right triangle is a triangle that has three sides with one of the angles measuring 90 degrees.

Given an angle and the length of the adjacent side, we are to determine the value of the hypotenuse using cos.

Cos = adjacent / hypotenuse

cos 33 = 6 /h

h = 6 / cos 33

h = 6 / 0.83867

h = 7.15

To learn more about right angled triangle, please check: https://brainly.com/question/20694080

COMBINE ALL LIKES TERMS.
r+r+r+r


r+3r+2​

Answers

Answer:

r+r+r+r=4r

r+3r+2=4r+2

Step-by-step explanation:

1. r+r+r+r

 r+r+r+r

=(r+r)+(r+r) ⇔ Group two together

=2r+2r ⇔ Simplify

=4r

2. r+3r+2

 r+3r+2

=4r+2

Hope this helps!! :)

Please let me know if you have any quesitons

Answer:

8r+2

Step-by-step explanation:

A satellite system consists of 4 components and can function if at least 2of them are working. If each component independently works with probability 0.8, what is the probability the system will function?

Answers

Answer:

X follows binomial distribution with n=4, p=0.6, q= 0.4. To make the system function adequately, at least 2 components should work well.

Step-by-step explanation:

Hope this helps

Answer:

0.9728

Step-by-step explanation:

We have 2 options for the system to fail - no components work, or only one works.

The probability that no components work is:

[tex]0.2^4 = 0.0016[/tex]

The probability that one SPECIFIC component works and the others failed is:

[tex]0.2^3 \cdot 0.8 = 0.0064[/tex]

And because there's 4 components, the chance that EXACTLY ONE works but the others don't is:

[tex]4 \cdot 0.0064 = 0.0256[/tex]

So we sum the probabilities:

[tex]P_{failure} = 0.0016 + 0.0256 = 0.0272\\P_{works} = 1 - P_{failure} = 0.9728[/tex]

Ez hw for my lil sis

Answers

Answer:

an apple is a cirlce and phone is a rectangle

Step-by-step explanation:

Answer:

Triangle and Circle

Banana and apple

Pizza and Pineapple

Bread and Corn

Suppose y varies directly with x and inversely with z. If y = 14 when x = 7 and z = 3, what is x when y = 3 and z = 8? Use the step-by-step process you learned to solve this problem.

Step 1: Set up the correct type of variation equation.
y =
✔ kx/z
Step 2: Determine the constant of variation.
k =

Answers

Answer:

The constant of variation k is 6 and the value of x is 4.

Step-by-step explanation:

What is constant of variation?

The constant of variation is the number that relates two variables that are directly proportional or inversely proportional to one another.

What is direct variation?

A direct variation is a proportionality relationship in which two quantities follow a direct relationship.

What is inverse variation?

Inverse variation states when one variable increases then the other variable decreases.

Given,

y=14 when x=7 and z=3

The variation equation is,

y=kx/z

Inputting the values,

14=(k*7)/3

14*3=7*k

42=7k

k=6

When y=3, z=8 we will find x.

y=kx/z

3=6*x/8

3*8=6*x

x=24/6

x=4

Hence, the value is 4.

To know more about constant of variation, direct variation, inverse variation here

https://brainly.com/question/11733777

#SPJ2

Please help I’ll mark you as brainliest if correct!

Answers

Answer:

B

Step-by-step explanation:

brainliest?

IF YOU ANSWER ALL THESE QUESTIONS I WIL LGIVE YOU BRAINIEST AMD 40 POINTS COME UP WITH PROBLEMS THANKS

Answers

Answer:

WHY YOU ARE ALWAYS SAY THAT CAN YOU WHOLE QUESTION..

Help please!!!! I’ll appreciate it so much!

Answers

Answer:

13. x = 4

14. x = -16

15. x = 11

Step-by-step explanation:

You can use photo math for the answers !

Connie bought 172 tulip bulbs. She wants to plant an equal number of bulbs in each of 4 flower beds. How many bulbs should Connie plant in each flower bed?
(wrong answer will get you reported)

Answers

Answer:

43

Step-by-step explanation:

172/4= 43

All of number 3 plz and thank u!

Answers

Hey what class is this for so I can help

what is the lateral area of the cone? 10 yd and 12.1 yd

Answers

Answer:

The lateral area will be "381 yd²". A further solution is provided below.

Step-by-step explanation:

The given values are:

Radius of cone,

r = 10 yd

Height of cone,

L = 12.1 yd

As we know,

The lateral surface area of cone is:

=  [tex]\pi r L[/tex]

On substituting the values, we get

=  [tex]\frac{22}{7}\times 10\times 12.1[/tex]

=  [tex]\frac{22}{7}\times 121[/tex]

=  [tex]380.28 \ yd^2[/tex]

0r,

=  [tex]381 \ yd^2[/tex]

A line has a slope of 6 and a y-intercept of 9. What is its equation in slope-intercept
form?

Answers

answer: y=6x+9

explanation: y=mx+b

Answer:

y=6x+9

Step-by-step explanation:

y=mx+b where m=slope and b=y-intercept

Whisper is exercised twice a day.
The first time is for 30 minutes.
The second time is for 11 hours.
i. Write down the fraction of a day that Whisper is exercised.
Write your answer in its simplest form.
ii.
Write down the fraction of a day that she is not being exercised.

Answers

Answer:

I:23/48

ii 25/48

Step-by-step explanation:

30min=0.5hr

total time exercised: 11+0.5=11.5hr

Divided by total hours of a day:

11.5/24=115/240=23/48

ii:(48-23)/48

i. 11.5/24hrs
ii.12.5/24hrs
STEP BY STEP EXPLANATION
1st time = 30 minutes
=0.5hr
2nd time=11hrs
Altogether =11.5hrs
1 day =24hrs
Fraction =11.5/24hrs

ii. Hrs not exercised = hrs in a day - hrs exercised
= 24hrs - 11.5hrs
= 12.5hrs
Fraction of day not exercised = hrs not exercised/hrs of the day
= 12.5/24hrs

Will mark brainliest !! Easy math

Answers

Answer:

increase = 37.38 cm²

You'd like the first way because it took less effort and less chance of a miscalculation.

Step-by-step explanation:

first way:

(just work with the difference in height)

(0.7 x 8.7 x 2) + (0.7 x 18 x 2) = 37.38 cm²

second way:

old total lateral surface area = (31 x 8.7 x 2) + (31 x 18 x 2) = 1655.4

new total lateral surface area = (31.7 x 8.7 x 2) + (31.7 x 18 x 2) = 1692.78

increase = 1692.78 - 1655.4 = 37.38 cm²

Answer:37.38cm2

Step-by-step explanation:

If I invest $1,000 at an 8.5% interest rate, how much money will I earn over 6 years?

Answers

6,000$

if the answer is wrong i am sorry :(

Answer:

$510

Step-by-step explanation:

Are (-2,4), (2,4), (4,2), (-2,-4) a function?

Answers

Answer:

Yes

Step-by-step explanation:

Are these triangles similar? If yes, write a similarity statement.

Answers

Yes because they both have the same degrees, but one is slightly rotated

What is the value of 4+2 +6r – tr when t =
=
- 3 and r = 5?
Enter your answer in the box.

Answers

you first substitute your values t and r ...Use BODMAS method ...Your final answer must be 51

Tell whether the following binomial is a factor of the polynomial

binomial- (x+8)

Polynomial- x^5-8x^4+8x-64


Please help :)

Answers

Answer:

Given polynomial

x⁵-8x⁴+8x-64= x⁴(x-8)+8(x-8)= (x-8)(x⁴+8)

after factorization of the given polynomial we didn't get any factor (x+8) , hence the following bionomial is not the factor of the polynomial.

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