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enot [183]
2 years ago
13

If the measures os an exterior angle of a regular polygon is 120 degrees, how many sides does the polygon have?

Mathematics
1 answer:
Elena-2011 [213]2 years ago
8 0
5 bc i took the test and it said it was right so
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Choose a system of equations with the same solution as the following system:
Lina20 [59]

Answer:

Option A.

Step-by-step explanation:

We are given 6x+2y =-6 ......(1) and 3x-4y=-18 .....(2)

Solving equations (1) and (2) we get

12x+3x =-30, ⇒x= -2 and from equation (1), 2y= -6-6(-2) =6, ⇒ y=3

Therefore, the solution for the given set of equations is x= -2 and y=3

A) Solving the equations 8x+4y = -4 ....... (3)and 17x+2y =-28, we get  

8x -34x = -4 -(-56) =52, ⇒-26x =52, ⇒x=-2 and from equation )(3), we get -16+4y =-4, ⇒ y=3

Therefore, the solution x=-2 and y =3 match with the original solution.

B)Solving the equations 12x + 4y = 12 ....... (4)and 21x + 2y = −36, we get  

12x -42x = 12 -(-72) =84, ⇒-30x =84, ⇒x=-84/30.

Therefore, the solution x=-84/30 does not match with the original solution.

C) Solving the equations 6x + 8y = −36 ....... (4) and 15x + 6y = −60, we get 18x -60x = -108 -(-240) =132, ⇒-42x =132, ⇒x=-132/42

Therefore, the solution x=--3  do not match with the original solution.

D) Solving the equations 6x + y = 15 ....... (5) and 15x − y = −9, we get 6x +15x = 6, ⇒21x =6, ⇒x=2/7  

Therefore, the solution x=2/7  do not match with the original solution.

Therefore, option A) will have the same solution. (Answer)

4 0
3 years ago
Solve each equation using the quadratic formula. Find the solutions.<br><br> x^2 - 6x + 7 = 0
LuckyWell [14K]
X^2-6x+7=0

-b +/- sqrt b^2-4ac all over 2a

a=1 b= -6 and c=7

6+/- sqrt 36-4×1×7 all over 2×1

6+/- sqrt 8 all over 2
6+/- 2sqrt2 all over 2
reduce
3+/- sqrrt2





5 0
3 years ago
Read 2 more answers
Solve each equation. Show all steps and work. your answers to four decimal places.
Virty [35]

Answer:

This equation is incorrect. The equation simplifies to -3=4 which is incorrect.

Step-by-step explanation:

3(-3)=-9. 3(2)=6

-9+6=-3

-3=4 FALSE

5 0
3 years ago
Please help n-(-8)=-2
inna [77]
I think that the value of n is -10
4 0
3 years ago
(0.2m^2n)^3 *1000m^4n^7<br> simplify
mina [271]

Answer:   8m^10n^10

Thats the answer i hope i was helpful!

6 0
3 years ago
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