Mathematics Middle School

Solve: 2x + 12 - 7x = -2

Answers

Answer 1
x=14 over 5 that's the answer I got when I did it on paper
Answer 2
2x + 12 - 7x = -2
1. you can either minus or add 7x to 2x 
2. which gives 9x + 12 = -2 
3. minus 12 on both sides
4. gives you 9x +-14  
5. divided -14 by 9

Answer is -1.55 repeatting

Related Questions

Angie is wrapping a present for her best friend. The box is 16 inches long, 12 inches wide, and 3 inches high. How many square inches of wrapping paper does Angie need for her present

Answers

Alright, you will need to find the areas of 3 of the sides(i.e. Top/Bottom, Left/Right, Front/Back), to do so let's go through multiplying these:

Since we're not looking for the Volume, we'd just multiply one variable by another, for instance:

Bottom = Length * Width
x = 16 * 12 | 16 * 12 = 192

Left = Length * Height
x = 16 * 3 | 16 * 3 = 48

Front = Width * Height
x = 12 * 3 | 12 * 3 = 36

Now that we know 3 of the sides, we then multiply each by 2 since there's another side to this box(in other words, we'd be adding both sides together, multiplying it by 2 still gives you the same answer though).

Bottom + Top, or Bottom * 2
192 + 192 = 384 | or | 192 * 2 = 384

Left + Right, or Left * 2
48 + 48 = 96 | or | 48 * 2 = 96

Front + Back, or Front * 2
36 + 36 = 72 | or | 36 * 2 = 72

Adding these together gives you the answer you're looking for. ^ ^
384 + 96 + 72 = 552

So, the answer should be that Angie needs 552 square inches of wrapping paper for her present. I hope that helped, have a great rest of your day!
| | Ghostgate (Alter) | |

Write two multiplication expressions that have a product of 20,000.

Answers

10,000x2=20,000
5,000x4=20,000
20•1,000 = 20,000

8,000•2.5 = 20,000

record the product 8x43 using expanded form to help

Answers

40×8=320[ 8×3=24 ]320+24=344

What times what equals 0.59??

Answers

2 X .295= .590

2 can go into .590 .295 times.

One of the multiple answers is:
4 x 0.1475= 0.59

Ethan wrote the number four million,three hundred five thousand, seven hundred sixtu-two as 4,350,762.Describe and correct his error.

Answers

He wrote 350 thousand instead of 305 thousand
his error was that for the 4,350,762 350 part he was supposed to write 4,355,762 because the word problem said four million, three hundred fifty five thousand, seven hunfred sixty two and not 4,350,762
 

The library charges $0.75 a day for overdue videos and $0.12 a day for overdue books. Emily pays a total of $3.48 in late fees. How many days late were the items?

Answers

the items were 4 days late
4 days
Add $0.75 to $0.12 you get $0.87
Divide $3.48 by $0.87 you get 4

Solve for x. 3x−82=x−6

20 Points

Answers

3x-82 = x-6

subtract 1 x from each side

2x -82 = -6

add 82 to each side

2x = 76

divide both sides by 2

x = 76/2 =38

x = 38


Check:

3(38)-82 = 38-6

3*38 = 114, 114-82 =32 and 38-6 = 32 32 = 32 TRUE

7.9 * 10^7 +6.58*10^6=

Answers

give me one second and I'll have you an answer
16580000.Hope this helps!

The function g(x) = –3x2 – 36x – 60 written in vertex form is g(x) = –3(x + 6)2 + 48. Which is one of the transformations applied to the graph of f(x) = x2 to change it into the graph of g(x) = –3x2 – 36x – 60? The graph of f(x) = x2 is made narrower. The graph of f(x) = x2 is shifted right 6 units. The graph of f(x) = x2 is shifted down 48 units. The graph of f(x) = x2 is reflected over the y-axis.

Answers

the vertex form of the function gives the vertex as (-6,48). The vertex of f(x)=x^2 is (0,0) so from this information, the vertex is moved LEFT 6 and UP 48. This cancels out two options. The coefficient -3 tells us that the graph is flipped or reflected over the x-axis (negative sign flips graph) and that all y-values will be 3 times as large. Larger y-values for the same x inputs makes the graph narrower.

In which expressions of the exponent be multiplied

Answers

It would be D. because since the other three are used for different operations, you would multiply 6 by -5 to get -30.

1\4 15\100 is it >,<, or =

Answers

1/4 = 25/100

25/100 > 15/100

hope this helps

Kevin is 14 inches taller than George. The difference between Kevin and Richard is two inches less than between Richard and George. Kevin at 6'6" is the tallest. How much tall are Richard and George?

Answers

 1 foot is 12 inches which makes 14 1.2

6.6-1.2= 5'4 george

richard is 6'0







Richard is 6'1" and George is 5'11" tall.

To calculate Richard and George's heights, we start with Kevin being 6'6" and 14 inches taller than George, meaning George is 5'4".

The difference between Kevin and Richard is 2 inches less than between Richard and George, making Richard 6'1" and George 5'11".

The product of a non zero rational number and a irrational number is always sometimes or never irrational

Answers

Always. The only way an irrational number can become rational is if it’s multiplied by a irrational number.

Hope this helps!
The answer is sometimes 

I'm learning about Equivalent systems of equations, please help!

Answers

OK to solve this, we have to solve each system presented through elimination or substitution and find which one is equivalent to that of the teacher's!

First let's solve for the teacher's:
-2x+5y=10
-3x+9y=6
Solve by substitution (I think elimination might be easier to do for this one, but I don't really remember 100% sorry!)
Isolate the x (or y) variable in the first equation
-2x+5y=10
-2x=10-5y
[tex]x= \frac{10-5y}{-2} [/tex]
Substitute x into the next equation and solve for y
-3(10-5y/2)+9y=6
3*10-5y/2+9y=6
(multiply both sides by 2)
3(10-5y)+18y=12
30-15y+18y=12
30+3y=12
3y=-18
y=-6

Substitute in x
x= -10-5(-6)/2
x=-20

TEACHER'S ANSWER (-20,-6)


GOKU
x-3y=-2
-2x+5y=-7
Do the same as above
Solve for x
x-3y=-2
x=3y-2
Plug in
-2(3y-2)+5y=-7
4-6y+5y=-7
4-y=-7
-y=-11
y=11

x=(3(11)-2)
x=31
GOKU'S ANSWER (31, 11)

SELINA:
-5x+14y=16
-3x+9y=12
One last time!! :)

-5x+14y=16
-5x=16-14y
x=(16-14y)/-5

-3(-(16-14y/5)+9y=12
3*16-14y/5+9y=12
3*16-14y+45y=60 
48-42y+45y=60
48+3y=60
3y=12
y=4

x=-(16-14(4))/5
x=8
SELINA'S ANSWER
(8,4)

So neither Goku or Selina got the same answer as the teacher
Here I go

The teacher's system is
-2x + 5y = 10
-3x + 9y = 6

To find the system that equals to the teachers solution, we must solve all three of them. (Yeah good luck)

Let's start solving the teacher's system

We need to solve -2x + 5y = 10 for x
-2x + 5y = 10
-2x = 10 - 5y
Divide both sides by -2
-2x/-2 = (10-5y)/-2
x = 5/2 y - 5
Now we need to substitute 5/2 y -5 for x in -3x +9y = 6
We gonna replace 5/2 y -5 by x
-3x + 9y = 6
-3(5/2 y - 5) + 9y = 6
Simplify both sides (I used a calculator)
3/2 y + 15 = 6
3/2 y = 6 - 15
3/2 y = -9
To find y, we need to divide both sides by 3/2
3/2 y/3/2 = -9/3/2  (I used a calculator)
y = -6
It easier to find x since we already find y
So, let's find x by substitute -6 for y in x=5/2 y - 5
What does that mean? We gonna replace the value of y which is -6 everywhere we find y (I hope it makes sense)
x = 5/2 y - 5
x = 5/2 (-6) - 5 (use a calculator)
x = -20

Therefor,
x = -20 and y = -6
This is the teacher's solution so we gonna solve the others and see what they have :)

----------------------------------------------
Selina's system

-5x + 14y = 16
-3x + 9y = 12

So, we need to solve -5x + 14y = 16 for x
-5x + 14y = 16
-5x = 16 - 14y
Divide both sides by -5
-5x/-5 = (16 - 14y)/-5
x = 14/5 y + -16/5     (It looks messy here)
To continue, we need to substitute 14/5 y + -16/5 for x in -3x + 9y = 12
-3x + 9y = 12
-3( 14/5 y + -16/5) + 9y = 12
Simplify both sides
3/5 y + 48/5 = 12
3/5  y = 12 - 48/5
3/5 y = 12/ 5
To find y, we just need to divide both sides by 3/5
3/5 y/3/5 = 12/5/3/5  (cancel 5, then divide 12 by 3 = 4)
y = 4
We gonna use the value of y to find x
We gonna do that by substitute 4 for y in x = 14/5 y + -16/5
x = 14/5 y + -16/5
We gonna replace y by 4
x = 14/5 (4) + -16/5 (used a calculator)
x = 8
Therefore,
x = 8 and y = 4
So, Selina system doesn't equal to the teacher's system.
-----------------------------------
Goku's system

again, I used the same steps to solve all of them.

x - 3y = -2
-2x + 5y = -7

We need to solve x - 3y = -2 for x
x - 3y = -2
x = -2 + 3y
I prefer to let the unknown value leads, so it will be
x = 3y - 2  (it still the same thing :) )
Substitute 3y - 2 for x in -2x + 5y = -7
-2x + 5y = -7
-2(3y - 2) + 5y = -7
-6y + 4 + 5y = -7
-y + 4 = -7
-y = -7 - 4
-y = -11
We cannot leave the y with a negative sign, so we must divide both sides by -1
-y/-1 = -11/-1
y = 11
To find x, we need to substitute 11 for y in x = 3y - 2
x = 3y - 2
x = (3)(11)-2
x = 33-2
x = 31
Therefore,
x = 31 and y = 11
Goku's answer doesn't equal to the teacher's answer.

------------------------------------------

Answer : Neither Goku or Selina

I hope I helped!

 

A rope 25 feet long is cut into 3 pieces. The forest piece is 2x feet long, the second piece is 5x feet long, and he third piece is 4 feet long.

a. Write and solve and equation find x.

b. Find the length of the first and second piece

Answers

(a) 2x + 5x + 4 = 25 <== ur equation
    7x + 4 = 25
    7x = 25 - 4
    7x = 21
     x = 21/7
    x = 3

(b) first piece = 2x....= 2(3) = 6 ft <=
     second piece = 5x....= 5(3) = 15 ft <=

Students use a balance to determine the mass of a marble in 7.5 G of graduated bottle contains 10 milliliters of water when the marble is carefully lowered into the granulated bottle and is completely covered with water the volume of the water containing the marble has increased to 12.5 ml what is the density of the marble

Answers

The volume of the marble = increase in volume of the water = 12.5 - 10 = 2.5 grans.

Denisty of the marble  = mass / volume = 7.5 / 2.5  =  3 grams/millimeter.

Answer:

3 g/ml

Step-by-step explanation:

After the marble was introduced into the graduated bottle, the volume change from 10 ml to 12.5 ml, this means that 12.5 - 10 = 2.5 ml is the volume occupied by the marble.

The mass of a marble is 7.5 g.

Density is defined as follows:

density  = mass / volume =

Replacing with the measures:

density = 7.5/2.5  =  3 g/ml

The science department buys the equipment shown in the table they bought all three items this year and how many years will they have had by all three items again

Answers

Item                          Time bought
MIcroscopes             Every 5 years
Safety goggles          Every 4 years
Test Tube                  Every 2 years

It would take 20 years for them to buy these three items at the same time.

We simply need to find the LCM or least common multiple of the 3 items using the number of years.

Microscopes - 5 years → 5, 10, 15, 20
Goggles - 4 years → 4, 8, 12, 16, 20
Test tubes - 2 years → 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 

A bus service drives passengers between Milwaukee and Chicago every day. They travel from city to city eight times each day. The distance between the two cities is 89 miles..In February there are 28 days. The company's budget allows for 28,000 total miles for February. Do you think the budget is reasonable? Explain

Answers

it is reasonable
to the budget

Answer:

Yes the budget is reasonable.

Step-by-step explanation:

A bus service drives passengers between Milwaukee and Chicago every day for eight times each day.

The distance between the two cities is 89 miles.

So, total distance covered per day = [tex]89\times8=712[/tex] miles.

Total distance covered in 28 days = [tex]28\times712=19936[/tex] miles.

As give, The company's budget allows for 28,000 total miles for February.

So, yes the budget is reasonable, as it is less than 28000.

Multiply 8.88x10 to the 4th power. Explain the shift of the digits and the change in the value of each digit

Answers

88800.. just undo 4 point backward
You just move 4 ponta Back

10 friends go out to lunch and order 9 large pizzas. The friends divide the pizzas evenly. Find how much pizza each friend got as a decimal

Answers

The friends would each have .9 

Hope I helped :)

a male lion needs as much as 15 pounds of food each day or 105 pounds of food each week.how much does a lion need in one year.
I'm just checking i have the answer i just want to check thx

Answers

Final answer:

If a male lion eats 15 pounds of food each day or 105 pounds each week, it would need about 5460 pounds of food in a year. We arrive at this by multiplying the weekly amount (105 pounds) by the number of weeks in a year (52 weeks).

Explanation:

The question is asking how much food a male lion needs in a year if it eats 15 pounds of food each day, or 105 pounds per week. If we want to know how many pounds of food a lion needs for an entire year, we would need to multiply that weekly amount by the number of weeks in a year. There are 52 weeks in a year. So, we take 105 pounds of food per week and multiply it by 52.

Calculation: 105 × 52 = 5460

So, a male lion needs about 5460 pounds of food in a year.

Learn more about Multiplication here:

https://brainly.com/question/35502092

#SPJ2

Identify the rate that does not belong with the other three. Justify your response

4.5 feet per second

112.5 in 25 seconds

86.4 feet in 18 seconds

54 feet in 13 seconds

Answers

4.5 ft per second doesn't fit with the others.

The other three are similar because they are all in the unsimplified format of distance in a period of time, while the first one is just a simplified rate that could be used to multiply easily.
4.5 feet doesn't fit with the others

Approximate √39 to the nearest whole number

Answers

36 < 39 < 49

√36 < √39 < √49

6 < √39 < 7

√39 ≈ 6

A decimal that contains digits that continue forever in a pattern is called a(n) ____ decimal

Answers

repeating decimal because it goes on for ever


A decimal that contains digits that continue forever in a pattern is called a repeating decimal

Container A is 13 inches by 19 inches. by 25 inches.Container B is 13 inches by 13 inches by 31 inches.In cubic inches,how much greater is the volume of Container A.

Answers

calculate thevolume of each container and then subtract the values.
volume of container A = 13*19*25 = 6175 in^3
volume of container B = 13*13*31 = 5239 in^3
container A is greater by 6175-5239 = 936 in^3 than container B

What value represents a number 10 times as great as 581,000?

Answers

The number would be 10*581,000 or 5,810,000

Chloe wants to cut a 37 in. piece of ribbon into three pieces. The second piece is to be 2 in. longer than the first, and the third piece is to be 3 in. longer than the second. How long will each of the pieces be?

Answers

1st piece = x

2nd piece = x+2

3rd piece = x+2+3 = x+5

37 = x +x+2 + x+5 =

37 = 3x+7

30=3x

x = 30/3 = 10

 1st piece = 10 inches

 2nd piece = 10+2 = 12 inches

 3rd piece = 10+5 = 15 inches

Tell me whether the expressions in each pair are equivalent... Please i beg Someone to answer this!

1. 6m+1 and 1x6+m
2. 9y and 9+y
3. mp+nq and mq+np
4. -(5-q) and 9-5
5. 8-4c and 4c-8
6. 3(5+z) and 15+2

Pls put down your answer in form!

Answers

1. 6m+1 & 1x6+m both = 6m+1

Find three consecutive even numbers that have a sum of 36

Answers

Formula:

x + (x +2) + (x +4) = 36

Solving:

3x + 6 = 36
3x = 30
x = 10

10,12,14

Hope this helps!

What is the product of 5 + 2i and 7 + 3i?

Answers

I is equal to negative 1
1) 5-2i or 5-2
2) 7-3i or 7-3
(5+{2xi}) x (7+{3xi}) = 29+29i
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