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Aleonysh [2.5K]
2 years ago
9

What is the sum of 7 of the interior angles of a regular decagon?

Mathematics
1 answer:
Dominik [7]2 years ago
6 0

Answer:

the size of interior decagon is 70

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Y=x+3 <br> 2x+y=-6<br> Find the solution :
Charra [1.4K]

Answer:

Your solution is (-3,0)

Step-by-step explanation:

Hi,

We know what Y is, so we can plug it into the second equation.

2x + y = -6

2x + (x + 3) = -6

Now, add the like terms...

3x + 3 = -6

3x = -9

x = -3

Now, plug x back in to find y.

y = x + 3

y = (-3) + 3

y = 0

Your solution is (-3,0)

Hope this helps :)

3 0
2 years ago
Help anyone<br> 8th grade math?
Kruka [31]

Answer: x = 1

Step-by-step explanation:

2.8 + 2x = 0.6 x 8

2.8 x + 2x = 4.8

2x = 4.8 - 2.8 (subtract 2.8 on both sides)

2x = 2

x = 1 (divide 2 on both sides)

Hope this helps

7 0
2 years ago
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Helppppppoppp please 10 points !!!
Evgesh-ka [11]

Answer:

2x+27+x+27=180

3x+54=180

3x=180-54

x=126/3

x=42

angle B=x+27

=42+27

=69 degree

Step-by-step explanation:

7 0
2 years ago
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10.44 is 14.4% of what number?
kipiarov [429]
The answer for that is .. 17?
3 0
3 years ago
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Factor completely<br> 9-6a-24a^2
Natasha_Volkova [10]
-24a²- 6a +9 = - 3(8a² +6a - 9)

8a² +6a - 9 =0

x=(-b +/-√(b² - 4ac))/2a
x = (-6 +/-√(36+4*8*9)  /(2*8) = (-6 +/-√(324)  /16 =  (-6 +/-18)/16
x1 =  (-6 +18)/16 = 0.75
x2 =  (-6 -18)/16 = - 1.5

-24a²- 6a +9 = - 3(8a² +6a - 9) = -3(a - 0.75)(a + 1.5)
7 0
3 years ago
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