Help me with my pre algebra hw

Answers

Answer 1

Answer: 0.4 (2x + 1/2) = 3 [0.2x+(-2)] - 4
0.4 (2x + 1/2) = 3(0.2x-2) - 4

Then, you have to use the distributive property.
0.8x + 0.2 = 0.6x - 6 - 4
0.8x + 0.2 = 0.6x - 10
0.8x - 0.6x + 0.2 = -10
0.2x + 0.2 = -10
0.2x = -0.2 - 10
0.2x = -10.2
x = -10.2/0.2
x = -51

Does that make sense?

Answer 2

Answer: We just distribute the numbers out inside the parenthesis:

0.4(2x + $(1)/(2)$ ) = 3[0.2x + (-2)] - 4
(0.4 × 2x) + (0.4 × $(1)/(2)$ ) = (3 × 0.2x) + (3 × -2) - 4
0.8x + 0.2 = 0.6x - 6 - 4

Join the like terms:

0.8x + 0.2 = 0.6x - 10

0.8x - 0.6x = -10 - 0.2
0.2x = -10.2

Divide by 0.2 to isolate x

$(0.2x)/(0.2)$ = $-(10.2)/(0.2)$
0.2 and 0.2 cancels out

x = -51

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Write a word problem to represent 2/5 × 1/2

Answers

People were invited to a party. 5 people were Invited but only 2 people came (2/5). Then , apparently, half of the people (1/2) invited from a different party came to that one. 2 lots of that 1/2.2/5 x 1/2. I hope this helps.

The pizza is 2/5 slices.1/2is of peperroni.Can you multiply 2/5✖️1/2??Why or why not??

What is 72 tens - 12tens

Answers

Solve:-

72 tens - 12 tens
72 tens - 12 tens = 72 - 12 = 60
72 tens - 12 tens = 60 tens

What is a trick for multiplying 9`s

Answers

A trick that is good for multiplying 9's is, remember that each time the tens digit changes the number in the ones spaces minuses 1. If you don't understand what I am saying look at the following:-

9
18
27
36
45
54
63
72
81

See the pattern? In the tens place you need to add 1 and in the tens place you need to subtract by 1.

Hope I helped ya!! xD

This works for 9 times 1 through 9 times 10. You can take the number that is times 9 and and minis the number by one. Then you think about what number plus the first number ( the number that is times 9 and and minis the number by one) equals 9 and that number goes in the tens place. If you don't understand then look at this:
9×1=09
9×2=18
9×3=27
9×4=36
9×5=45
9×6=54
9×7=63
9×8=72
9×9=81
9×10=90

To the nearest hundredth, what is the distance between point (-6, -1) and point (4, 3)?

Answers

The distance between point (-6, -1) and point (4, 3) is 10.77.

Answer:

10.77

Step-by-step explanation:

What does mean absolute deviation represent?

Answers

is the average of the absolute deviations from a central point. ... In this general form, the central point can be the mean, median, mode, or the result of another measure of central tendency.

What is black and white and has lots of problems

Answers

In a math book we use blank ink with white pages. Thus, it is a math test.

Given information:

Black and white and has lots of problems.

As per given in question, A test is prepared to check the knowledge obtained by a person during the study time. It was performed before the test presentation. Well, a math book can have black ink with white pages but also a math test can have black and white combination.

It is said to be full of problems because it is made to solve exercises on different topics. And it is said to be black and white because normally the sheets are white and the ink is black.

Therefore, it is a math test.

Learn more about math test here:brainly.com/question/14124586

Answer:

The answer is: A math test

Step-by-step explanation:

A test is designed to assess the knowledge obtained by a person during the study time that was performed before the test presentation.

It is said to be full of problems because it is made to solve exercises on different topics.

And it is said to be black and white because normally the sheets are white and the ink is black.

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