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3 years ago

Can you show me how you worked this: Evaluate the expression. 9! − 7!

Mathematics

1 answer:

Aloiza [94]3 years ago

3 0

I hope this helps you

9.8.7!-7!

7! (72-1)

7!.71

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Answer:

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The measure of two complementary angles are in the ratio 1 : 5. What are the degree measures of the two angles? What is the solu

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3 years ago

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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

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

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3 years ago

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Anettt [7]

Answer:

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Step-by-step explanation:

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2 years ago

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