Mathematics Middle School

!GIVING BRAINLIEST!

The sum of 3 numbers is 21. One of the numbers is 12.9. The other two numbers are equal to each other. What is the value of the other numbers

Answers

Answer 1

Answer:

4.05+4.05+12.9=21

Step-by-step explanation:

Take 21 subtract 12.9 first, then you take the leftover number which is 8.1 then divide it by 2 giving you 4.05.

Answer 2
It’s 4.05


12.9+4.05+4.05=21

Related Questions

Evaluate the expression when a = 4, b = 15, and c = 16.
a+c

will give brainliest

Answers

Answer:

20

Step-by-step explanation:

This is the information we know :

A. a = 4

B. b = 15

C. c = 16

a + c

The a and c represent variables that must be substituted by their value, since we know their initial value, we substitute :

a + c when a = 4 and c = 16

4 + 16

20

The answer is 20 because a=4 and c=16 then 4+16=20

five more than the product of two and a number, decreased by seven;

evaluate when a = 8

A 2-column table with 7 rows. Column 1 is labeled Key Words with entries five, more than, product, two, a number, decreased by, seven. Column 2 is labeled Replace with entries 5, +, times, 2, a, minus, 7.

Write and evaluate the expression. Then, complete the statements.

First, write the expression
.

Second,
8 in for the variable, a.

Third,
by using
✔ order of operations
.

The answer is
.

Answers

Answer:

First, write the expression

✔ 5 + 2a – 7

.

Second,

✔ substitute

8 in for the variable, a.

Third,

✔ simplify

by using

✔ order of operations

The answer is

✔ 14

5+ (2a-7)
= 5 + (2•8-7)
= 5 + (16-7)
= 5+9
= 14

Esther is cutting construction paper into rectangles for a project. She needs to cut one rectangle that is 12 inches × 12 1/3 inches. She needs to cut another rectangle that is 10 1/2 inches by 10 1/3 inches. How many total square inches of construction paper does Esther need for her project?

Answers

Answer:

12 inches x 12 1/3 inches = 303.470769506 and 10 1/2 inches by 10 1/3 =

0.79432823472

Step-by-step explanation:

I WOULD BE VERY  VERY SORRY IF THIS IS WRONG I AM SORRY IF ITS WRONG BUT IF ITS NOT WRONG YOUR WELCOME

Monica is making a design for art class she is experimenting with how to transform line segment AB in her design

Answers

Answer:

it will be A.  Line segment AB and its image will be the same length and in different  positions.

Step-by-step explanation:

hope this helps

Answer:

A reflection does not change lengths, so answers B and D are not right.

In most cases, a reflection will change the position of any object; so answer A would be right.

However, if segment AB is contained inline l, its reflection in line l will be in the same position.

Or if line l is the perpendicular bisector of segment AB, then the reflection of segment AB inline l will be in the same position as segment AB, but with the two endpoints, A and B switched.

So, with the question as posed and no further information about the relationship of line l and segment AB, the best answer is A; but in certain cases answer, C could be right.

Please hurry I need this done by 2!.. Greg enters a triathlon race. He swims 1.25 kilometers, bikes 20.5 kilometers, and runs 1.59 kilometers.

How many kilometers is the race?

Enter your answer as a decimal in the box.
20 point 1 6
km

Answers

Hola solo vine a joder xd

Answer:

23.34km

Step-by-step explanation:

just add all of them up to get 23.34km

Can you form a triangle with these given side lengths? 5 , 5 , 5

PLEASE HELP ME!!!

Answers

Answer:

Which of these expressions is equivalent to 1/4x − 16 ?


a. 1/4(n−4)

b. 4(n - 4)

c. 1/4(n -6 4)

d. 4(n - 64)

Answers

Answer:

I don't think any of these are correct I am sorry

Step-by-step explanation:

someone already answered you, ima just type because i need points sorry

HELP ME PLZ!!!
You can complete three-tenths of a task in an hour. Your friend can complete one-fifth of the same task in an hour. How long will it take to complete the task if you work together? Explain.
_______ hours.

Answers

Answer:

2 hours

Step-by-step explanation:

If you convert 1/5 to tenths it's 2/10.

If you add 2/10 and 3/10 you get 5/10 which would be how much off the task you got done in one hour.

Therefore you times 5/10 by 2 and you get 10/10 so the task is done and it took 2 hours.

i got 2 hours for the answer

A laptop has listed a price of $802.99 before tax. If the sales tax rate is 7.25%, find the total cost of the laptop with sales tax included. Round your answer to the nearest cent, as necessary

Answers


Net Price: $ 802.99
+ Sales Tax (7.25%): $ 58.22
Total Price: $ 861.21
the answer is $861.21

Q5. A builder rents a digger. He pays a fixed charge of $30 plus $10 per hour to rent the digger. Work out how much he pays to rent the digger for: a) 1 hour b) n hours (1.5 x 2 = 3)









Q6) The width of a rectangle is x centimetres and its length is (x+ 2) cm. Write down an expression for the perimeter of the rectangle, giving your answer in its simplest form. (2+1=3 marks)

Answers

Answer:

A)40

Step-by-step explanation:

A)10x+30

10(1)+30

10+30

40

the answer to the question is = 40

A doctor replaces the fish tank in her office. Do the fish have more room to swim in the new tank? Find the volume of each tank to find out.

The volume of the old fish tank, in cubic feet:

Answers

Answer: The volume of the old fish tank is 10 ft. The volume of the new fish tank is 8 ft.

Step-by-step explanation: The formula for a rectangle is A=l*w. Multiply the length and the width of the tank. 4*2 1/2 = 10. And 4*2 = 8. So the old fish tank is bigger than the new one.

Pls help it is due today

Answers

The answer is February, 7:00 AM

Answer:

Well on February it clearly shows it’s the highest at the point goes right across to 7:00 so the second one

Step-by-step explanation:

Algebra question I don’t get it because you usually have to multiple A by C but there is no C in the problem.

Answers

Ok so basically, when you say multiply A by C, that is simplifying.

And in this case, you are factorising in this question. You turn back into brackets basically.

We have:
72x^2 - 32

x^2 = x squared

factorising means finding the factor of.

(Forget the x squared for the moment to make life easier)

Factors of 72:
1 and 72
2 and 36
3 and 24
4 and 18
6 and 12
8 and 9
(9 and 8 = it repeats so we stop there)

And then factors of 32:
1 and 32
2 and 16
4 and 8
(8 and 4 = repeats so we stop there)

Notice how we see 8 twice in both factors of 72 and 32, this means that we use 8 as the main number we are going to multiply each of the 2 numbers in the brackets by. This is because it is the biggest common factor - this is what we have!

This is what we would have:
8(9-4)

BUT, that is not the answer!
Keep in mind we have the x squared too

But, 32 doesn’t have it?!!

It would be:
8(9x^2 - 4)

Do you get it??

Try to simplify it! Does it equal to 72x^2 - 32?

(And I am so very sorry for the long explanation, once you get the hang of it, it makes sense. Hope my explanation helped) :)










The length of a field measures 3.5 miles.

What does the length of the field measure in feet?

13,200 ft
15,840 ft
18,480 ft
21,120 ft

Answers

The answer is 18,480
The answer is 18,480ft

HELP ME PLS I BEG U THX PLS ANSWER

Answers

Answer:

E

Step-by-step explanation:

James determined that these two expressions were equivalent expressions using the values of x = 4 and x = 6. Which statements are true? Check all that apply.

7 x + 4 and 3 x + 5 + 4 x minus 1
When x = 2, both expressions have a value of 18.
The expressions are only equivalent for x = 4 and x = 6.
The expressions are only equivalent when evaluated with even values.
The expressions have equivalent values for any value of x.
The expressions should have been evaluated with one odd value and one even value.
When x = 0, the first expression has a value of 4 and the second expression has a value of 5.
The expressions have equivalent values if x = 8.

Answers

Answer:

first and third

Step-by-step explanation:

I'm not sure how to do these, slader is no assistance to me.

Answers

Answer:

Perimeter: 18 ft

Height: 7 ft

Base Area: 12

Surface Area: (7)*(8) + 2(47) = 150

Step-by-step explanation:

To find the perimeter add all the edges together.

5 + 5 + 8 = 18

To find the height look at the diagram. 7ft shows the height of the rectangle and thus is the height for the rest of the shape.

Base Area:

Multiply the length (8ft) of the base by the height of the base (3ft)

8 * 3 = 24

Then divide by 2 to get the total area of the triangle

24 / 2 = 12.

Surface Area:

To find the surface area you to need to find the specifics of each side.

The base area we already solved for which is 12. We'll get back to this in a minute. The other double sides are of 5 * 7. That equals 35. Add together 12 + 35 to get 47. That is what will go in the 2(___) box because both of those sides have 2. It is the same number when done this way versus just adding them up.

47 * 2 = 94

12 + 12 + 35 + 35 = 94

Then for the (___)(___) that would be 7ft * 8ft because it is the only side left and does not have a double so it must be separate.

7 * 8 = 56

56+94 = 150

Use Photomath it’s a great app

Fabiola’s dog is 5 pounds heavier than one-third of the weight of Luisa’s dog. Fabiola’s dog weighs 23 pounds. Use the diagram to write an equation to represent the dogs’ weights. Let f represent the weight of Luisa’s dog.


The top section represents
.
The bottom section represents
.
The equation is
.

Answers

Fabiola’s dog = 5 + 1/3 Luisa’s dog
23 = 5 + 1/3f
18 = 1/3f then multiply both sides by 3
54 = f, Luisa’s dog

Answer:

23 pounds

5+1/3f

23=1/3f+5

Step-by-step explanation:

(￣o￣) . z Z

Which of these equations has the solution x = 5?
A. x + 7 = 3(x - 1)
B. 12 - x = x + 4
C. 2(x + 1) = 3(x - 8)
D. 2(x - 4) = 7x - 1

Answers

The answer is A
X+7 = 3(x-1)
X+7 = 3x-3
-x on both sides
+3 on both sides
10 = 2x
Divide by 2
X=5
Answer is A
3(x-1)=3x-3
X+7=3x-3
-x both sides
+3 both sides
10=2x
Divide by 2
X=5

In this diagram, ∠EDH is a right angle, and ∠EDF≅∠FDG .





What is the measure of ∠EDF ?

Answers

A : 29
Explanation: Well if EDF and FDG are equal to each other then subtract 32 from 90 and then divide by 2. When you do this, you are finding how much you can use and if they are both equally then just divide it by 2.

Answer:

29 degrees

Step-by-step explanation:

a right angle is 90 degrees,

90-32=58

58/2=29

What is the surface area?

10 m
10 m
10 m

Answers

Answer:

10x10=100

100x6=600

600m2

Step-by-step explana30tion:

Answer:

600    your welcome

What is x - 12 = 6
THANKSSSSSSSSS

Answers

Answer:

18

Step-by-step explanation:

x - 12 = 6

x = 6 + 12

x = 18

Please help this is worth 15 points!

Answers

It should be Non proportional

What is the area of the parallelogram?

1 over 32 square foot
5 over 16 square foot
9 over 32 square foot
6 over 16 square foot

Answers

Answer: A=bh

ans: 5/16 which is option B

Step-by-step explanation:

answer is 5/16 which is option b

[A] is making 25 sundaes with mint, chocolate, and vanilla ice cream.
3/5 of the sundaes are mint ice cream and 1/2 of the remaining sundaes are chocolate. The rest will be vanilla. How many sundaes will be vanilla?

Answers

Answer:

5 sundaes

Step-by-step explanation:

find the GCF: 5

so 3x5 would be 15

15 mint.

25-15=10

10/2=5

boom

There are [tex]$5$[/tex] sundaes will be vanilla ice-cream.

Learn more about Probability

Probability is the likelihood that an event will occur and is calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

It is given that, there is [tex]$25$[/tex] sundaes with mint, chocolate and vanilla flavor ice cream out of these [tex]$\frac{3}{5}$[/tex] of the sundaes are mint flavor and [tex]$\frac{1}{2}$[/tex] are chocolate flavor.

We have to find the number for sundaes will be vanilla flavor ice-cream.

So,

We have to multiply [tex]$3$[/tex] by [tex]$5$[/tex] and solve it.

So,

[tex]$3\times 5=15$[/tex]

There are [tex]$15$[/tex] mints flavor.

Now,

Divide total number of sundaes with all flavor ice-cream by calculate value for mint.

We get,

[tex]$25-15=10$[/tex]

Multiply the above calculate value by no. of remaining sundaes for chocolate ice-cream.

So,

[tex]$10\times \frac{1}{2}=5$[/tex]

Hence, there are [tex]$5$[/tex] sundaes will be vanilla flavor ice-cream.

Learn more about Probability here,

https://brainly.com/question/11234923

#SPJ2

A 2-column table with 5 rows. Column 1 is labeled Days with entries 1, 2, 3, 4, 5. Column 2 is labeled miles with entries 6, 12, 18, 24, 30.
Which scenario matches the relationship shown in the table?
Sakura walked 6 miles yesterday.
Sakura walks 6 miles every day.
Sakura walked less than 6 miles.
Sakura walked 1 day in 6 miles.

Answers

I believe that it is “Sakura walks 6 miles every day”

Answer:

Sakura walks 6 miles every day.  

Brainly plz :))

please help with them all please i need help asap

Answers

Answer:

Step-by-step explanation:

Hope this helps u and sorry me handwrighting is BAD but idc!

What the person who sent the picture said is correct

what would the volume be for a cone that has a diameter of 16 and a height of 45

Answers

Answer:

3015.93 units^2

Step-by-step explanation:

V=3015.93 units squared

(MIDDLE SCHOOL MATH) Help please, thank you.

Answers

Answer:

730

Step-by-step explanation:

I think that's it, sorry if that's wrong

Answer:

It would be 939 (if I did the question correctly and I’m so sorry if I didn)

Step-by-step explanation:

Identify the inequality graphed on the number line.
A) x - 8 < 3
B) x + 8 < 3
C) x - 8 < -3
D) x + 8 < -3

Answers

Step-by-step explanation:

look at the attachments

A) x<11

B) x<-5

C) x<5

D) x<-11

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