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solmaris [256]
3 years ago
14

Why is 2-7 not equal to 7-2

Mathematics
1 answer:
tangare [24]3 years ago
6 0
When adding/subtracting with different signs, u subtract and take the sign of the larger number.

2 - 7 = -5
7 - 2 = 5
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May u guys help me jus me out 5 ez questions for u guys to help me with
Elena-2011 [213]

Answer:

1. -29/156 2. 38/45 3. 29/45 4. 113/24 or about 4.7 5. 457/1,  914/2,  1371/3

Step-by-step explanation:

3/13 - 5/12 can be simplified to 36/156 - 65/156. Subtract this and you get -29/156  

4/9 + 2/5 can be simplified to 20/45 + 18/45. Add this and you get

38/45

5/8 - 2/9  can be simplified to 45/72 - 16/72. Subtract this and you get

29/45

3 1/2 + 2 5/12 can be first made irrational to 7/2 + 29/24. This can be simplified to 84/24 + 29/24

113/24 or about 4.7

Not sure about the 457, but to convert it, you multiply it by whatever denominator you have. For example

1x457 = 457/1

2x457 = 914/2

And finally 3x457 = 1371/3

3 0
2 years ago
Determine the approximate value of X. <br><br> 8.56<br><br> 2.78<br><br> 9.46<br><br> 29.12
Nitella [24]

Answer:8.56

Step-by-step explanation:

7 0
3 years ago
Which postulate proves that △ABC and △EDC are congruent?
Diano4ka-milaya [45]

The correct answer is SAS.


It's given that BC is congruent to CD and AC is congruent to CE. And by Vertical Angles theorem, Angle BCA is congruent to DCE.

7 0
3 years ago
Which function has the same domain as y = 2 StartRoot x EndRoot
snow_lady [41]
The answer is A. Y=square root of 2x
4 0
3 years ago
How can you use the backward problem-solving strategy to solve a two-step equation
neonofarm [45]
Let's use the equation 5x - 20 = 10 as an example for this.

To work backwards from this, you would add the same amount to each side.

You want to isolate the 5x so that you can solve for x.

To do that, you would add 20.

But again, you must add and subtract the same amount to both sides.

So it would look a bit like this:

5x - 20 + 20 = 10 + 20

That would simplify to 5x = 30, or in other words, x = 6.

Basically, you isolate the multiple of the variable then divide the answer to the equation from that multiple.

In the example, 5 is the multiple and after isolating it, the answer was 30.

30 ÷ 5 = 6

x = 6

Hope this helps :)
5 0
3 years ago
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