Mathematics Middle School

-3 (n + 5) = 12
Please explain its due tonight and I need to study for my math unit test tomorrow if I fail I don’t pass.

Answers

Answer 1
First you want to distribute, keep in mind you cannot add in the parentheses because they are NOT like terms.
Once u distribute you should have
-3n-15=12
Now you want to add 15 to both sides to cancel it out ( because n has to be isolated)
-3n=27
Now you want to divide by -3 to both sides to get n by itself
n=-9
Answer 2
-3 (n+5) = 12
-3•n -3•5
-3n-15 = 12
-3n+15 = 12+15
-3n = 27
-3n/-3 = 27/-3
n = -9 or -9n

Related Questions

What is the value of x and y please explain will give brainliest if you give me a good explanation!!

Answers

x = 30
y = 120

30 x 4 = 120
120 + 120 = 240
240 + 120 = 360
The first number in an ordered pair is a value for x, and the second number is a value for y.

Can someone answer this

Answers

Answer:

2÷1 =2

2x1 =2

2-1 = 1

Step-by-step explanation:

Hopw this helps

2 divided by 1 = 2
2 X 1 = 2
2 - 1 = 1

Find the solution to:
y=0.5+1
y=2x-2

Answers

The answer is A because once you plug them in the equation the answers will be the same
A should be the answer

one step equation Y/1.8=80 what’s the answer?? ( with steps )

Answers

Answer:

5) Y = 144

Step-by-step explanation:

[tex]\frac{Y}{1.8} = 80[/tex]

Bring 1.8 from the numerator to the denominator and change the sign from divide to multiply. Also, the 1.8 switches sides so the equation looks like:

Y = 80*1.8

Y = 144

Hence, Y is equal to 144.

Hope this helps!!!

Please mark me as brainliest!!!

Y / 1.8 = 80
X1.8 X1.8
Y = 144


Not entirely sure if this is correct

What is the area of this figure?

_______ square kilometers

Answers

Answer:

90 square kilometers

Step-by-step explanation:

1. split the figure in small definite sections

2. find the areas of the smaller sections.

3. find the sum of the areas.

Answer : 90
Step-by-step explaining
Split this figure into three different figures
The first figure will be 8x4 = 32
The second figure will be 8×6 = 48
The last figure is 2×5 = 10
Done we add 32+48+10= 90

PLEASE HELP ASAP!!! Which of the ten groups show at least one 8th grader?
A. 3, 7, 8, 10
B. 4
C. 1, 2, 5, 7, 8, 10
D. 1, 3, 4, 5, 6, 7, 8, 10

Answers

Answer:

1 3 4 5 6 7 8 10

Step-by-step explanation:

the numbers 7,8,9,0 represent 8th graders and the groups 1 3 4 5 6 7 8 10 all contain at least one of the numbers while the others groups dont meaning they are no 8th graders in groups 2 or 9

The correct awnser is D, 1,3,4,5,6,7,8,10

can you help please help

Answers

Answer:

90 degree rotation

Step-by-step explanation:

pls give brainleist

:)

90 degree rotation all the way around

Plis help with this problem! (Screenshot attached)

"Find the surface area of each pyramid. Round to the nearest tenth if necessary."

Answers

Answer: The total surface area is 633.9

Step-by-step explanation:

12.25 times 15.75, then divide by 2 = 96.46875 (this is the area of the triangle

Then times 4 = 385.875 (Because there are four triangles

15.75 times 15.75 = 248.0625 (The area of the square)

The sum is 633.9375

Rounded = 633.9

yes because when u ok so he said yes would go

How to solve this? WILL GIVE BRAINLIEST

Answers

8x-10=6x
8x-6x=10
2x=10
X/2 10/2 = x=5
X=5 that will be your answer

ik yall brainly ppl know what this is.

Answers

Lol absolutely no idea so sorry but I would like to know the answer too
This should be right. Just counted the blocks for all, but for the ramp I used pythag. All the adding us for the total surface area which is just the area of all the individual shapes added together

turn this fraction into a decimal 3 3/8

Answers


The answer for this equation would be 3.375

Answer:

3.375

Step-by-step explanation:

divide 3/8 and you get 0.375 then add 3 and you get 3.375

How do you find the surface area of this?

Answers

Answer:

132

Step-by-step explanation:

No way you can find the whole area with one solution. So we have to go by each shape.

Let's start with the triangle on top, only one part of it. We know that half of the base is 3. We could go long and hard and use the pythagorean theorem and then repeat that 8 times. Instead, you can imagine moving the 2 triangles into a rectangle. Now you have a rectangle that is 3x4 inches. Repeat 4 times for each of the triangles. Then just the square which is 6x6. Add them and bam!

what’s the answer to this?

X/3+1 = 6

Answers

Answer: x=15

Step-by-step explanation:

x/3+1= 6

Step 1: Subtract 1 from both sides (always do inverse operations with the number, not the x term(s))

x/3 + 1-1 = 6-1

x/3= 5

Step 2: Now we need to isolate x (get it on its own). To do this, we must move the 3 to the other side, which we will do by multiplying the 3 and the 5 (as since the 3 was used for divisision, its inverse operation is multiplication).

x/3 = 5

x = 5x3

x= 15

Step 3: Check by using PITA, or "Plugging In the Answers"

We came to the conclusion that x=15. Now, we can "plug in", or substitute the x in the equation for 15:

x/3 + 1= 6

15/3 + 1= 6

5+ 1= 6

6=6

Correct ✔️

Answer:

X = 24

Step-by-step explanation:

3 + 1 = 4

X/4 = 6

Multiply both sides by 4

X = 24

A prism has a length of 4 centimeters, width of 2 centimeters, and height of 10 centimeters. Use the prism to complete the statements. The surface area of the prism is cm2. The volume of the prism is cm3.

Answers

Answer:

Surface area = 136 cm²    Volume = 80cm³

Step-by-step explanation:

Surface Area = face 1 + face 2 + face 3 + face 4+ face 5 + face 6

SA = 2(4) + 2(4) + 2(10) + 2(10) + 4(10) + 4(10)

SA = 8 + 8 + 20 + 20 + 40 + 40

SA = 16 + 40 + 80

SA = 136

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

Volume = l*w*h

Volume = 4*2*10

Volume = 8*10

Volume = 80

Answer:

4

Step-by-step explanation:

*

HELP MEEEE!!!!!!!!!!!!!!!!!

Answers

The answer is D.

9*(8+4)/4=27
The Answer would be D.27

Put the following equation of a line into slope-intercept form, simplifying all fractions. 2x-10y=-20

Answers

y = 1/5x + 2


Slope-intercept form:

y = mx + b

First, you must get y alone by subtracting 2x on both sides of the equation and then dividing both sides by -10:

-10y = -2x - 20

y = -2/-10x - 20/-10


Simplify: y = 1/5x + 2

Answer: y = 1/5x + 2

Check out the workings I have done in the document I have uploaded :)

Twelve movie tickets cost $84. How much does a single movie ticket cost?

Answers

Answer:

The answer would be 7 dollars.

Step-by-step explanation:

Hope this helps!

Answer:

$7

Step-by-step explanation:

84 divided by 12 is 7 so it would be 7 dollars

Which figure is a trapezoid?

A 4-sided shape with 2 parallel sides.
A 4-sided shape with 4 parallel sides.
A 4-sided shape with 4 parallel sides.
A 5-sided shape with 2 parallel sides.

Answers

Answer:

none of those

Step-by-step explanation:

A trapezoid is a 4-sided shape with 1 parallel side

Could you pls choose this as brainliest???!!!

The answer would be a four sided shape with one set of parallel sides. Parallel sides are two sides that will never touch or intersect. To further explain, if we take the left and right sides of the trapezoids and extend them, they will eventually intersect meaning that they aren’t parallel. This will go for and trapezoid, no matter the side lengths. However, if we take the top and bottom sides of a trapezoid and extend them left and right, we will find that they will never intersect which is how we know that a trapezoid only has one pair of parallel sides.

Which relationships describe angles 1 and 2?

Select each correct answer.


adjacent angles

complementary angles

supplementary angles

vertical angles

Answers

Answer:

Complementary Angles

Step-by-step explanation:

They are both in right angles

complementary angles they are both on the origin line

The circumference of a circle is 125.6 millimeters. What is the circle's diameter?
Use 3.14 for ​.

Answers

Answer:

C = 2 pi r, so diameter is 40!

Step-by-step explanation

125.6 = 2 pi r

125.6 divided by 2 is 62.8.

Now its, 62.8 = pi times r

62.8/3.14 = 20.

r = 20

but this is the radius so the diameter is 2 times for than the radius. 20 x 2 = 40

The answer to your question is 40

9-2x=-8-4x Its for math

Answers

Answer:

x=-8.5

Step-by-step explanation:

Combine like terms:

9+8=-4x+2x

Solve:

17=-2x

Divide:

17/-2=x

-8.5=x

Hope this Helps!

Answer:

your answer is x=-8.5

Step-by-step explanation:

PLS HELP WILL GIVE BRANLIEST: The angle measurements in the diagram are represented by the following expressions. ∠A=5x-5 ∠B=3x+13
solve for x then find the measurement for ∠B

Answers

Answer: x = 9

Angle B = 40

Step-by-step explanation:

5x-5 = 3x+13 Those angles are the same, they are corresponding angles

5x = 3x + 18 Solve the equation

2x = 18

x = 9


3(9)+13 Solve it

Angle B = 40


Hope this helps.

I think the answer is x=9 and angle B=40

The bearing of point B from point A is 034°.
Find the bearing of point A from point B.

Answers

Step-by-step explanation:

180 minus 34 degrees gives 146° not that sure

180-34=146 so the answer is 146 degrees

The table shows the cost of hiring a plumber for the first 3 hours of a job.

Which graph shows the points in this table?


Ps: sorry there are too many screen shots.

Answers

Answer: it's A

Step-by-step explanation:

since the cost for hiring a plumber for three hours costs $120 so in graph A the graph has more likely stopped at $120 on the y axis which can be said as the cost axis too. I'm pretty sure the answer is A!

A
The cost of working is$150

whats greater brianliest + MAX ponits or 4 x 2160 4 x 2610

Answers

It is equal. The same either way. :)

Hey there!

PROBLEM #1. 4 * 2,160

4 * 2,160
= 2,160 * 4

= 2,160 + 2,160 + 2,160 + 2,160

= 4,320 + 4,320

= 8,640
Therefore, the answer should be: 8,640

Problem #2. 4 * 2,610
4 * 2,610
= 2,610 * 4

= 2,610 + 2,610 + 2,610 + 2,610

= 5,220 + 5,220

= 10,440

Therefore, the answer should be:

10,440


Good luck on your assignment & enjoy your day!



~Amphitrite1040:)

what does x equal in this y=2x + 3

Answers

Answer:

y=bh

Step-by-step explanation:


It depends on your y, assuming that you're trying to find the x-intercept;
y = 0,

x = -3/2

Triangles A and B have vertical heights x cm and (x+3) cm respectively. The areas of Triangles A and B are 30cm² and 32cm² respectively. (a) Find, in terms of x, an expression for the base of: (i) Triangle A (ii) Triangle B (b) Given that the base of Triangle B is 4 cm less than the base of Triangle A, form an equation and show that it reduces to x² + 4x - 25 = 0 (c) Solve the equation and hence, find the height of Triangle B.​

Answers

Answer:

Hi,

Step-by-step explanation:

Let say a the base of the triangle A and b the base of the triangle B.

[tex]a)\\\left\{\begin{array}{ccc}\dfrac{a*x}{2}&=&30\\\dfrac{b*(x+3)}{2}&=&32\\b=a-4\\\end{arraqy}\right.\\\\(i): a=\dfrac{60}{x}\\\\(ii): b=\dfrac{64}{x+3}\\\\b)\\\dfrac{64}{x+3}=\dfrac{60}{x}-4\\\\64x=(60-4x)*(x+3)\\\\4x^2+16x-180=0\\\\x^2+4x-45=0\\\\\Delta=16+4*45=196=14^2\\x=\dfrac{-4+14}{2}=5\ or\ x=\dfrac{-4-14}{2}=-9\ (impossible)\\So\ x=5,\ a=\dfrac{60}{5}=12, b=\dfrac{64}{5+3}=8\\\\Area\ of\ A=12*5/2=30\\Area\ of\ B=8*8/2=32\\\\Height\ of\ triangle\ B=x+3=5+3=8.\\[/tex]

It should equal to eight.

calling brainiacs... probably some math logic question that im not getting.

Answers

The picture blurry can we get a better picture
All I need is for you to tell me what the first question is asking, which citrus fruit?

solve the inequality
1/5x+3>9

Answers

Answer:

Step-by-step explanation:
First, you would want to subtract the 3 on the left side to the right side to get the 1/5x to be alone.
1/5x>6
Next, we need to solve for x, by multiplying 5 to cancel out the 1/5.
(5)1/5x>6(5)
That leaves us with x>30
treat the inequality sign as an equal sign, that should help

its gonna be x>30 because x+15>45 then u subtract .

A warehouse holds 94,896 bottles of water. There are the same number of bottles in each
aisle. How many aisles could there be?
Select all the possible numbers.
4
8
9
2
Submit

Answers

there are 3 answers which are 4 8 and 2
They have 3 answers 2 , 4 and 8
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