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Arlecino [84]
3 years ago
9

-2(x+5)=4 use distributive property

Mathematics
2 answers:
MAVERICK [17]3 years ago
6 0

Answer:

-2x - 10 = 4

Step-by-step explanation:

distributive property is were you distribute (give out) this to every one

(-2 time x) + (-2 times 5) = 4

-2x - 10 = 4

now solving for x all you do is add ten to both sides --> -2x = 14

now divide by -2 to get x alone --> x = 14/-2 = X = -7

Hatshy [7]3 years ago
3 0

Answer:x=-7

Step-by-step explanation:

-2(x)+(-2)(5)=4

-2x-10=4

-2x=14

x=-7

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How many triangles and quadrilaterals altogether can be formed using the vertices of a 7-sided regular polygon?
MAVERICK [17]

Answer:  The correct option is

(E) 70.

Step-by-step explanation:  We are given to find the number of  triangles and quadrilaterals altogether that can be formed using the vertices of a 7-sided regular polygon.

To form a triangle, we need any 3 vertices of the 7-sided regular polygon. So, the number of triangles that can be formed is

n_t=^7C_3=\dfrac{7!}{3!(7-3)!}=\dfrac{7\times6\times5\times4!}{3\times2\times1\times4!}=35.

Also, to form a quadrilateral, we need any 4 vertices of the 7-sided regular polygon. So, the number of quadrilateral that can be formed is

n_q=^7C_4=\dfrac{7!}{4!(7-4)!}=\dfrac{7\times6\times5\times4!}{4!\times3\times2\times1}=35.

Therefore, the total number of triangles and quadrilaterals is

n=n_t+n_q=35+35=70.

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8 0
3 years ago
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Step-by-step explanation:

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3 years ago
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Cerrena [4.2K]
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4 0
2 years ago
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