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Lena [83]
3 years ago
8

Is -7 + 9= 9 + 7 true, false or open

Mathematics
2 answers:
Natasha_Volkova [10]3 years ago
6 0
-7 + 9  \neq  9 + 7

2 \neq 17

When you add a positive number and a negative number, you get a positive, but the number is smaller. If you add two positive numbers, then of course, you're going to get a positive number as an answer. But overall, this is false.
True [87]3 years ago
5 0
That's false -7+9=2 and 7+9=18
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Answer:

Step-by-step explanation:

2x + 5 = -x  - 1

3x + 5 = -1

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x = -2

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(-2, 1)

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3 years ago
The two legs (labeled x) of the right triangle below have equal length. If the hypotenuse has length 5√2 , solve for x.
leonid [27]

Answer:

x=5

Step-by-step explanation:

Other than using the plain special aspect of a 45-45-90 triangle where the legs are x, x, and x√2, you can solve for this.

Since the two legs have equal length, they are both x. Using the pythagorean theorem:

(x^2)+(x^2)=50 (Because 5 squared is 25 and √2 squared is 2, multiplying them gives you 50).

You can add (x^2) and (x^2) because they are the same terms (x squared).

Simplifying like so gives you:

2x^2=50

Dividing by two on both sides:

x^2=25

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x=5

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3 years ago
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Murrr4er [49]

Answer:

B- One-Quarter

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2 years ago
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H = hours, so h is less than or equal to 5.
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Read 2 more answers
Which is true about the slope of a line?
Inessa05 [86]

Answer:

Step-by-step explanation:

The slope of all lines in quadrant 1 is positive. FALSE

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