Mathematics Middle School



Renan found the sum (4.2x + 3) + (5.7x – 2) + (5 – 2.6x), as shown.

4.2x + 3 + 5.7x – 2 + 5 – 2.6x

4.2x + 5.7x + 2.6x + 3 – 2 + 5

(4.2 + 5.7 + 2.6)x + 3 – 2 + 5

12.5x + 6

Answers

Answer 1

Answer:

He used the commutative property incorrectly.

Step-by-step explanation:

Answer 2

Answer:

a is correct

Step-by-step explanation:

Related Questions

The two plots below show the heights of some sixth graders and some seventh graders:

Two dot plots are shown one below the other. The title for the top dot plot is Sixth Graders and the title for the bottom plot is Seventh Graders. Below the line for each dot plot is written Height followed by inches in parentheses. There are markings from 52 to 57 on the top line and the bottom line at intervals of one. For the top line there are 2 dots above the first mark, 1 dot above the second mark, 1 dot above the third mark and 2 dots above the fourth mark. For the bottom line, there is 1 dot above the third mark, 1 dot above the fourth mark, 3 dots above the fifth mark and 1 dot above the sixth mark.

The mean absolute deviation (MAD) for the first set of data is 1.2 and the MAD for the second set of data is 0.8. Approximately how many times the variability in the heights of the seventh graders is the variability in the heights of the sixth graders? (Round all values to the tenths place.)
Group of answer choices

1.5

2.2

3.0

4.6

Answers

Answer:

i think its 3.0 but im not sure

Step-by-step explanation:

I don’t get it, what am I supposed to be multiplying!?!

I dont get it, what am I supposed to be multiplying!?!

Answers

Answer: 5400

Step-by-step explanation: image attached

I dont get it, what am I supposed to be multiplying!?!

Answer:

5400

Step-by-step explanation:

we need to calculate the area of big box (prism).

volume = 4 1/2 X 5 X 3 3/4

= 84.375 in³.

volume of small cube = 1/4 X 1/4 X 1/4

= 0.015625 in³.

now we need to find how many of the small ones go into the big one.

84.375/0.015625

= 5400.

You have a pizza with diameter 12
2
3 in., and a square box that is 12.65 in. across. Write 12
2
3 as a decimal. Can you fit the pizza inside the​ box?
What is the decimal expansion for 12
2
3​?
A.12.6
B.12.65
C.12.6
D.12.66
pls help me

Answers

Answer:

D is the right choice and no you cannot fit the pizza inside the box.

Step-by-step explanation:

D is the answer because to turn 2/3 into a decimal you would divide 2 by 3 and the answer you would get would be 0.66666666666...You would then add 12 to the answer and get 12.6666... Once you get this answer you would round it to the hundredths to get 12.67 but since that is not an option you could use D, 12.66 inches.

Answer:

I believe the answer is D.

Step-by-step explanation:

GOOGLE

English is the predominant language spoken in Chile. Question 1 options: True False

whoever answers first gets the crown

Answers

Answer: The answer is false!

Step-by-step explanation: You may think its true but NO, its not true!

Answer: false

Step-by-step explanation:

the correct answer is a dialect of spanish, chilean spanish.

A 222-inch pipe is cut into two pieces. One piece is five times the length of the other. Find the length of the shorter piece.
The shorter piece is __ inches long

Answers

Answer:

The shorter piece is 37 inches long.

Step-by-step explanation:

Let the length of the shorter piece be x and the longer piece be 5x.

Short piece + Long piece = 222 inches

x + 5x = 222

6x = 222

x = 222 ÷ 6

x = 37

Heres a fact the last fact i know its maybe not true but the Goodyear Blimp is the official bird of Redondo Beach, California.

Answers

redondo beach is situated near the goodyear blimps home airport in carson, california

Answer:

that is true i search it up

Step-by-step explanation:

PLEASE HELP ME. if you get answer right congrats

PLEASE HELP ME. if you get answer right congrats

Answers

Answer:

Should be 32

Step-by-step explanation: 96 divided by 15 is 6.2 then 6.2 times 5 is 32.

The answer is 32.

96 divide by 3 = 32

Help pls- I can't, my brain hurts-

Help pls- I can't, my brain hurts-

Answers

28x + 15y
x represents the amount of sweatshirts and y represents the amount of sweatpants
28 dollars for each sweatshirt with x players wanting sweatshirt
15 dollars for each sweatpants with y players wanting each sweatshirt
So the expression is 28x+15y to get the total amount of money

what is the math answer

what is the math answer

Answers

Answer:

v = 52

Step-by-step explanation:

v - 4 = 6*8

v - 4 = 48

v = 48+2=52

Answer would be v = 52 hope that helps you

y=2x-7 4x+y=11 which ordered pair makes both equations true

Answers

Answer:

x=3 y=-1

Step-by-step explanation:

substitute into one of the equations: 4x+2x-7=11

rearrange unknown terms to the left side of the equation: 4x+2x=11+7

combine like terms: 6x=18

divide both sides by x: x=18/6

calculate to product: x=3

Same thing for y:

y=2x3-7

y=6-7

y=-1

Solution:

x=3

y=-1

hey, guys id prefer it if someone could walk me through this step by step thx! Write an expression that is equivalent to the expression below. 3.5(2.4x+8.6y)-2.9(5x-6.5y)-(3.1x+7y)

Answers

Answer:

Step-by-step explanation: ok so first you need to circle all your variables x.

which are 2.4x+5x+3.1x adding those you get 10.5.

then circle your variables y which is 8.6y+6.5y+7y you get 22.1 then subtract those you get -11.6

hope this helps

PLZ BRAINLIEST PLZ

Answer:

Pls need points

Step-by-step explanation:X=25472.384

i need help with these math problems FAST

i need help with these math problems FAST

Answers

Answer:

172.5

Step-by-step explanation:

if you take 273.02 (the sum of the withdraws) and  172.5 (the sum of the deposition) and subtract them you get 100.52

Answer:

hi my name is hris

Step-by-step explanation:

Someone help me with this ASAP!

Someone help me with this ASAP!

Answers

Answer:

48.1 somewhere around 36 and 57

Step-by-step explanation:

Answer:

36-57

Step-by-step explanation:

18.50 x 2.6 = 48.10, which is between those two numbers

pls help me on this question its giving me stress lol..!

pls help me on this question its giving me stress lol..!

Answers

Answer: it is B as it is adding the same amount each time.

Step-by-step explanation:

Now It's Time to Practice on Your Own

















































Nathan's calculator displays the following: 5.987e-5

Enter the correct number in each box to rewrite the number.

Answers

What in tarnation is this
I would say 5.987 x 10^-5

I need help ……. PLEASE

I need help . PLEASE

Answers

Answer:

Step-by-step explanation:

32

The following figure shows a right triangular prism.
Which expression represents the surface area of the prism?
Choose 1 answer:
(Choice A) 2 x 6 + 50 + 30
(Choice B) 6+6+30+40+50
(Choice C) C 12+12+40+30+50
(Choice D) 1/2 x 3 x 4 x 10

pls help!!

Answers

Answer:

Step-by-step explanation:

option D is the correct answer

1/2*3*4*10

HOPE U GOT THE ANSWER

PLS MARK THE BRAINLIST!! (❁´◡`❁)

The answer is choice D

I hope this helps!!

Can some help please with this MATH! Thanks

Can some help please with this MATH! Thanks

Answers

Answer:

19.6 ft

Step-by-step explanation:

4²+x²=20²

16+x²=400

384 = x²

x = 19.6 ft

Answer:

19.6 feet

Step-by-step explanation:

We know that

The hypotenuse is 20 feet, and the bottom leg is 4 feet.

We also know that Pythagorean theorem is used when there is one missing side to a triangle.

\(a^{2}\) + \(b^{2}\) = \(c^{2}\)

Substitute in a for 4 and c for 20. The hypotenuse is always the variable c.

4^2 + b^2 = 20^2

16 + b^2 = 400

b^2=384

\(\sqrt{384}\) = 19.6

bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

Answers

Answer:

b)

Step-by-step explanation:

Supplementary angles add up to 180 degrees, so the answer must be b).  Let's check the math:

77 + (5x + 18) = 180

-77                    -77

(5x + 18) = 103  --> here we already know this is correct, as the problem tells us that angle H is equal to this equation, (5x + 18), and we know that it is also equal to 103.

The correct answer will be B

A project will take a total of 720 person-days to complete. If the project must be completed in 30 days, how many people must be employed? PLEASE HURRY

Answers

Answer:

192 hours per day / 8 hours per person per day = 24 people

Step-by-step explanation:

Assuming each person works for 8 hours a day, the total number of hours needed to complete the project is:

720 person-days x 8 hours = 5,760 hours

To complete the project in 30 days, the total number of hours needed per day is:

5,760 hours / 30 days = 192 hours per day

It’s 24!! EXPLAIN-720/30=24 because you have to divide the amount of people by days p/d= e

What is the most appropriate measure of center and what does it describe in the high jump heights data set?

What is the most appropriate measure of center and what does it describe in the high jump heights data

Answers

Answer:

The best measure of center would be the median and its describes the greatest and lowest height.

Step-by-step explanation:

It would be the median because putting them all in a line and counting in helps to find the median but also since there is a space, you know that it automatically has to be the median and since there is that space it would have to be describing the greatest and lowest heights.

it would be the median

what equation is true for x=10 PLS ANSWER ASAP
A. 2x + 5 = 25
B. 3x + 5 = 17
C. 5x - 18 = 7
D. 6x - 10 = 26

Answers

A.

2x+5=25
-5 -5
2x =20
/2 /2

x=10

Translate the phrase into an algebraic expression.
b divided by 3

Answers

B/3 this is the answer because we do not know the amount of ‘b’.
B/3 is the answer. Hope it answered your question


Round to the nearest ten, then estimate the product. 82 x 78 = ___

5,600
6,300
6,400
7,200 i just want to make sure i picked the right one, i want to get a 100% on my test

Answers

Answer:

The answer is 6,400 I hope you get a good grade

1) 43.36 - 23.23

2) 75.12 + 20.13

3-12) Create 10 problems of your own and solve them. (5 addition and 5 subtraction

can you also pls create 10 promblems to? i dont get this one

Answers

44.36-23.23=21.13 there you go one answer

What is the solution to x + 7 = 22?
A. x = 14
B. x= 7
© C. x= 15
D. x= 29

Answers

Answer:

x = 15

Step-by-step explanation:

x + 7 = 22

Subtract 7 from each side

x+7-7 = 22-7

x=15

Option C. 15
15+7=22

14+7=21 X
7+7=14 X
29+7= 36 X

Without using a calculator, convert the fraction to a decimal.
2/4=?

Answers

Divide 2 into 4,

So .50

To convert the fraction 2/4 to a decimal, we can perform the division 2 divided by 4 using long division or mental math.

2 ÷ 4 = 0.5

Therefore, 2/4 as a decimal is 0.5.

Luke walked 6 blocks from his house to the bus stop. He rode the bus 24 blocks to the post office. Later, he came home the same way. How many blocks did Luke travel in all?

Answers

Answer:

60

Step-by-step explanation:

First you have to get how long it took to get there, you can do that by adding 6 and 24 (walking distance and bus ride distance) That will get you 30 now we need to times that by 2 to get how long it took to get there and to get back. That will make the answer 60!

If you have any questions please ask me! :)

Luke traveled 60 blocks.

A construction crew is lengthening a road that originally measured 41 miles. The crew is adding one mile to the road each day. Let L be the length (in miles) after D days of construction. Write an equation relating L to D. Then use this equation to find the length of the road after 38 days.

Answers

We can simply find our answer and this is our solution
38D+41=L

Answer:

We can simply find our answer and this is our solution

38D+41=L

Step-by-step explanation:

a - 8 = 42

1/3 - 8 = 42

3 - 8 = 42
\Order a, b, and from least to greatest.

Answers

Answer:

Step-by-step explanation:

a is 50-8 =42

1/3 -17 +59=42

3-8=5-47=42

A is 50, both question for last to is 42
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