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postnew [5]
3 years ago
6

Which of these are true equations?

Mathematics
2 answers:
marusya05 [52]3 years ago
8 0

Answer:

1 and 3

10 = 8+2

8+2=5+5

Wrong:

7-2=7+1

7-2=5

7+1=8

Tom [10]3 years ago
3 0
8 + 2 = 5 + 5 hope this helps!
You might be interested in
The system of equations below has no solution.
mixer [17]

Answer:

  • Second option: 0 = 26

Explanation:

This is the given system of equations:

\frac{2}{3} x+\frac{5}{2} y=15\\ \\ 4x+15y=12

A linear combination of the system is any equation formed by the algebraic addition of both equations, one or both multiplied by an arbitrary constant.

To prove that the given system has no solution you could multiply the first equation times 6 (to get rid of the fractions), multiply the second equation times - 1, and add the two results:

<u>1. First equation times 6:</u>

6\times\frac{2}{3} x+6\times\frac{5}{2}y=6\times 15\\ \\ 4x+15y=90

<u />

<u>2. Second equation times - 1:</u>

-4x-15y=-12

<u />

<u>3. Add the two new equations:</u>

0=78

<u />

<u>4. Conclusion:</u>

Since 0 = 78 is false, no matter what the value of x and y are, the conclusion is that the system of equations has not solution.

The only choice that represents that same situation is the second one, 0 = 26. That is a possible linear combination that represents that the system of equations has no solutions.

In fact, you might calculate the exact factors by which you had to multiply each one of the original equations to get 0 = 26, but it is not necessary to tell that that option represents a possible linear combination for the given system of equations.

7 0
3 years ago
Read 2 more answers
A set of children’s blocks contains three shapes: long, flats, and cubes. There are three times as many longs as cubes and 30 fe
kati45 [8]

Answer:

<u>There are 270 longs</u>

Step-by-step explanation:

<u>Equations</u>

We must write the problem into a mathematical model that allows us to apply the properties of basic algebra and solve for the variable which must be adequately set up.

We have three unknowns: the number of long blocks, flats blocks, and cubes. The conditions are given:

  • There are three times as many longs as cubes
  • There are 30 fewer flats than longs.
  • There are 600 blocks in all

For the equation to be easier solved, let's set the variable as the number of cubes:

x = number of cubes

Considering the first condition, we have

3x = number of longs

3x-30 = number of flats

And finally:

x + 3x+3x-30=600

Joining like terms:

7x=630

Solving for x

\displaystyle x=\frac{630}{7}=90

Therefore, there are 3x = 3*(90) = 270 longs

Answer: there are 270 longs

7 0
3 years ago
Please help!!!! i will give brainliest
ehidna [41]

......The last one              

skskkskkssnsmsmsms

5 0
3 years ago
A movie theater determines its profit, in dollars, using the expression 10n - 1000, where n is the number of tickets sold.
Alja [10]

Answer:

E

600

Step-by-step explanation:

10n - 1000 = 5000

10n = 6000

n = 600

HOPE THIS HELPS

PLZZ MARK BRAINLIEST

7 0
3 years ago
A swimming pool is 20 feet wide and 40 feet long. If it is surrounded by a walkway of square tiles, each is 1 foot by 1 foot, ho
Lena [83]

Answer:

124 tiles

Step-by-step explanation:

2(20+40)

2(60)

120+4=124

5 0
3 years ago
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