Mathematics Middle School

A CLOSER LOOK
Solve Equations by Substitution
f
Determine whether the given value for the variable is the solution to the equation.
2n+5=27; n=11
Substitute the value for the variable.
2⋅11+5=?27
The value for n is 11, so replace n with 11.

Think About ItWhy does the equals sign have a question mark above it?

While the expression on the left has a variable, the expression has no value. Once we replace the variable with a number, the expression immediately has a value. Until we simplify that expression, we don’t know what this value is and whether or not it’s the same value as the expression on the right. Therefore, we place a question mark over the equals sign to show that we don’t know whether the expressions are equal.
Simplify.
2⋅11+5=?27
22+5=?27
27=27
The left side of the equation has an expression that must be simplified. Follow the order of operations. First, multiply 2 by 11 to get 22. Then, add 22 and 5 to get 27. Since the expression on the left is the same as the expression on the right, the expressions are equal.

Conclude.
n=11 is the solution to the equation.

Since substituting 11 for n resulted in the expression on the left equaling the expression on the right, 11 is the solution to the equation.

Answers

Answer 1

Answer:

Step-by-step explanation: 48

Related Questions

The ratio 3 : 7 and 6 : 14 are equivalent ratios. Is the ratio 28 : 12 equivalent to these? Explain your reasoning.

Answers

Answer: Yes it is equivanlent, because 3x4= 12 and 7x4=28. So therefore yes all three of them are equivanlent.

Step-by-step explanation:

Yes it it an equivalent hood this help you

If 80​% of the registered voters cast 388,800 votes in an​ election, how many registered voters are​ there? Use pencil and paper. In another election 90​% of the registered voters cast 437,400 votes. How do the number of registered voters compare in the two​ elections?

Answers

You want to cross multiply. So:

388,800 x 100%= 38880000

38880000/80%= 486,000 voters.

For the second part you subtract 437,400-388,800=48,600

It costs $1 for 4 pounds of bananas at the local grocery store. Create a table, and equation to represent this proportional relationship.

Answers

It will be .25 cents per pound of bananas. So some marks on the graph would be (.25,1),(.5,2),(.75,3),(1,4). And the equation is y=0.25x
Answer: $0.25

Explanation: If you have $1 and you spend all your money and buy bananas each banana will cost 25p. This is because 100 divided by 4 is 25.

There are 8 students performing in the holiday concert. Of the students, 5
are boys. What decimal represents the fraction of students that are boys?

Answers

Answer:

0.625

Step-by-step explanation:

its my answer

62.5 because 100 divide by 8 is 12.5 then I multiplied it by five witch got me 62.5

Karen drew a plan for a rectangular piece of material that she will use for a blanket. Three of the vertices are (-1.4,-3.7), (-1.4,2.6), and (2.4,2.6). What are the coordinates of the fourth vertex?

Answers

Answer:

(2.4,-3.7)

Step-by-step explanation:

It is correct, I know it!

The answer is (2.4,3.7) I think I’m not to sure tho

What is the length of the line segment with endpoints (5, −7) and (5, 11) ?



Enter your answer in the box.

units

Answers

Answer:

The answer is 18 units.

Step-by-step explanation:

Your x is the same throughout so you focus on the y. You first have to get up to 0 so you add 7. Then you have to get up to 11 so you add 11 to that 7 which gives you 18.

Answer:

18

Step-by-step explanation:

i tooked the quiz for K12 and it was correct

20 pts if you can help this part is for half my grade

Answers

Answer:

z = 13 degrees

Step-by-step explanation:

1.) Those two angles add up to 90 degrees, so we can say that 5z - 6 + 2z + 5 = 90

2.) Simplify both sides to get 7z - 1 = 90.

3.) Isolate Variable by adding 1 on both sides to get 7z = 91.

4.) Divide by 7 on both sides to find that z = 13 degrees.

Answer:

z = 13

Step-by-step explanation:

5z - 6 + 2z + 5 = 90

7z - 1 = 90

7z = 91

z = 13

Hope this helps!

Which statements are true about fractions and ratios? Select all that apply.
I'm being timed so please answer quick.

Answers

A and c are the correct statement
A and C are correct

Three​ roads, A,​ B, and​ C, all run south to north. They each meet a highway that runs west to east. Road B is4.5 of Road A. Road C is 3.6 of Road B. Describe the location of Road C with respect to Road A.

Answers

I think it’s a Bc I got a 100 on that one

Dave owns 15 shares of ABC mining stock. On Monday, the value of each share rose $2, but on Tuesday the value fell $5. What is the change in the value of Dave’s shares?

Answers

Answer:

Let's take each share by itself first.

First, the value of each share rose by 2. So we have +2. Then it fell by 5. So we have 2 - 5 = -3. Each share has a net value of negative 3.

Dave owns 15 shares. So 15 * (-3) = -45.

-$45

In short, the answer is $45

Let x = the current value of the stocks

So if each stock increases by 2 dollars - the total value increases by 15 lots of $2

x + (15 x 2) = the new value (we will call this n)

Each stock then decreases in value by $5

So…

n - (5 x 15) = the final value of the stocks (we will call it f)

$2 - $5 = -3$

And -3 x 15 = -45

So Dave has lost $45 in shares

HELPPP PLEASE PROVIDE EXPLANATION

Answers

Answer:

a

432in^2

b

36

Step-by-step explanation: sorry I only have half

10 x ?? I i don’t know

I need lots and lots of help with this.... plz make an explanation for this

Answers

Answer:22

Step-by-step explanation:

So we start with 15 pizza's, after the party 1.5 of the pizza is left which is 3 pizza's, dog ate 25% of the 3 remaining pizza's and we know that each pizza had 12 slices so 36 slices were remaining when the dog found the pizza and 25% of 36 is 9 so we take 36-9=27 then Jill eats 5 slices,  so now we have 22 slices remaining so she threw away 22 slices.

PLS HELP
Solve the equation for n. Show your work.
3n+16=7n

Answers

Answer

Y=4

Step-by-step explanation:

3x4=12 12+16=28

7x4=28

Answer:

Step-by-step explanation:

7n = 3n + 16

4n = 16

n = 4

I need help with this answer fast enough and you could get brainliest!

Answers

1. 3.3

2. 1.6

3. 2.5

4. 0.7

Answer:

1st number line: 3.3

2nd number line: 1.6

3rd number line: 2.5

4th number line: 0.7

Step-by-step explanation:

Giving BRAINLIEST :D
20 Points

Given this equation;

5p + 3 = 15

Write a situation that this equation could help you solve and explain how each part of the equation relates to the situation you create.

Answers

Answer:

P = 2.4!!

Step-by-step explanation:

Situation: Lets say you have 5 cookies in a cookie tin. Your little sister/brother/pet takes 3 cookies and starts eating them. You take the left over cookies (2.4) and put them back in the tin. You are angry, and ask your sibling to replace your cookies, so they give you 2 and a few crumbs from their own cookie tin. Then your grandma comes over and hears about the "cookie stealing". she then gives you 3 cookies.

p=2.4 because 15-3=12 what else equals 12 5x2.4

I need help!!!!!
9,252 ÷ 5 =
R

Answers

Answer:

1850.4

Step-by-step explanation:

answer 1850.4
Hope it helps

HeLp!

While preparing for a morning conference, Mrs. Morvis is laying out 9 dozen bagels (1 dozen=12) on square plates. Each plate can hold 13 bagels.
How many plates of bagels will Mrs. Morvis have? How many more bagels will be needed to fill the final plate with bagels?
Mrs. Morvis will have _______ plates and she will need ________ bagels to fill the final plate.

Answers

the answer is 8 plates 3 bagels
step by step solution.

Help! im in my 6th Period Math Class!

A plane is at an altitude of 29,817 2/3 feet above ground level. After 30 minutes, the plane rises by an altitude of 5,319 3/8 feet. Which of the following is true about the altitude of the plane after 30 minutes?

Answers

Answer:

Hi where are options. Hope you understand mr

2.34 degrees Celsius, negative 2 over 7 degrees Celsius, −0.45 degrees Celsius, 3 over 8 degrees Celsius
brainlyist

Answers

Answer: What is the question?

Step-by-step explanation:

Please say the question

solve the equation
will mark brainlist

Answers

Answer:

[tex]x = - 10[/tex]

Step-by-step explanation:

Hope this helps!

Answer:

The solution for X would be -10

Select the correct answer.
Which data set has the widest spread?
A.
data set A: 3, 1, 2, 6, 7, 2, 5
B.
data set B: 4, 9, 4, 5, 3, 6, 8
C.
data set C: 1, 4, 6, 5, 7, 8, 5
D.
data set D: 4, 3, 4, 7, 2, 3, 1
E.
data set E: 5, 1, 4, 2, 6, 9, 2

Answers

Answer:

D

is the answer plss forgotten about everything and focus 9n your work

D is the correct answer!

HELPPPP PLSSSSS ASAP

choices for the drop down boxes

1: 15, 18, 24, or 27

2: above or below

Answers

Answer:

27 below

Step-by-step explanation:

fish is below x feet below water

distance between fish and diver is 6

if double depth to which fish goes is 42

then its current depth is 42/2 = 21

so scuba driver is 21 + 6 below the surface of water

27 below

27 because 22+6 =27.

help please...................

Answers

Answer:

You can make the other person brainliest now

Step-by-step explanation:

Pls Make an explanation for this answer because I dont understand it

Answers

Answer:

11=w

Step-by-step explanation:

I find a common denominator which would be 10. By multiplying by 10, you can get rid of the fractions.

[tex]\frac{10}{1} (\frac{3w}{10})= 3w\\\frac{10}{1} (\frac{w}{5})= 2w \\2w+3w=5.5\\5w=5.5(10)\\55/5= 11\\w=11[/tex]

Hope this helps:) Have a good day!!

11=w !! Have a great day!!!

SOMBoDY HELP I pICKED A RANDOM ANSWER aND I DOnT kNoW IF iT IS rIGhT

Answers

Im not exactly sure, but I think what you have is right. Show the question, of the problem. So, I can make sure!

I think you’re right put don’t take me word for it hope it is though!

Can someone help me i cant find the answer i have been trying for almost 1 hour literally

Answers

Answer: 9

Explanation: 5 can only go into 46 nine times, which leaves a remainder of 1
46 divided into groups of 5 is the equation

46 divided by 5 = 9r1

The one won’t count leaving 9 groups.

Hope this helped. Much love and good luck!! <33 :)

9 divided by 920= answer 5

Answers

No if you divide 920divided by 9 it would be 184

0.33 x 0.7=?

Pls explain how you got this
PLS HELP ANSWER QUICKLY

Answers

Answer:

0.33×0.7=0.231

I hope this will help you

Answer:

0.231

Step-by-step explanation:

      2

  0.33

x   0.7

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

 0.231

You move the decimal three number to the left because   y e s

The table shows the ratio between the number of books ordered and their cost: Number of Books Cost (dollars) 7 28 8 32 9 36 Find equivalent ratios when the number of books ordered is 1, 2, and 3. Write them as ordered pairs in the form (x-coordinate, y-coordinate). Starting from the origin, explain how to plot the three equivalent ratios on a coordinate grid. (10 points)

Answers

 Answer:

X axis:                                            Y axis:

0                                                          0

1                                                           4

2                                                          8

3                                                         12

4                                                         16

5                                                         20

6                                                         24

7                                                         28

8                                                         32

9                                                         38

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The ordered pairs (in case you want to copy paste them) are:

{(0,0),(1,4),(2,8),(3,12),(4,16),(5,20),(6,24),(7,28),(8,32),(9,38)}

I hope this helps!! If you found my answer helpful, please give it brainliest :))

Rex has a square deck that is 9 feet long on each side. He decides to add triangular benches in each corner as is shown in the diagram.

Answers

ANSWER:

area of square=9 ft × 9ft= 81 ft²

area of one triangle= 1/2 ×3²=4.5ft²
4.5ft²×4=18ft²

remaining area= 81ft²-18ft²=63ft²

Hope this helped! And if you have anymore questions please let me know :) have a great night/day
area of square=9 ft × 9ft= 81 f2
area of one triangle= 1/2 ×32=4.5f12
4542×4=18842
remaining area=81ft2-18812=63f12
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