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shtirl [24]
3 years ago
6

Which polygon is a concave octagon?

Mathematics
2 answers:
Bezzdna [24]3 years ago
8 0

The polygon in option 3 is not octagon at all, it is heptagon (or 7-sided polygon).

A convex octagon has no angles pointing inwards. More precisely, no internal angles can be more than 180°.

When some internal angle is greater than 180°, it is concave.

In option 2 you can see that one angle is pointing inward, then this octagon is concave.

Answer: correct choice is B.

Lena [83]3 years ago
3 0
2nd one. it is concave because one of the side goes inside of the octogon.Its pretty easy tbh. Hope it helped.
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Erica solved the equation −5x − 25 = 78; her work is shown below. Identify the error and where it was made.
Romashka-Z-Leto [24]
In step one, you are supposed to add 25 to both sides, because if you just subtract, it would be -5x-50=53
8 0
3 years ago
A bag contains 10 red marbles, 7 green marbles. and 8 striped marbles. A marble is picked, then put back into bag. Find P(green
SIZIF [17.4K]

G = number of green = 7

S = number of striped = 8

T = number total = 10+7+8 = 25

probability of picking green = P(G) = G/T = 7/25

probability of picking striped = P(S) = S/T = 8/25

P(green and striped) = P(G)*P(S)  ... events are independent

P(green and striped) = (7/25)*(8/25)

P(green and striped) = (7*8)/(25*25)

P(green and striped) = 56/625

P(green and striped) = 0.0896

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In summary, the answer as a fraction is 56/625

In decimal form, the answer is 0.0896

The value 0.0896 can be converted to percent form to get 8.96%

8 0
3 years ago
Convert from general form to standard form x^2 + 4y^2 + 6x-40y+9 =0​
Burka [1]

x^2 + 4y^2 + 6x-40y+9 =0\\x^2 + 6x+9+4y^2-40y=0\\x^2+6x+9+4y^2-40y+100-100=0\\(x+3)^2+(2y-10)^2=100

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7 0
3 years ago
Anna wants to rent movies from either Service A or Service B. Service A charges $37.92 as a subscription fee with a charge of $2
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Answer:

6 is your answer :)

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Hoochie [10]

Answer:

  • 36 units

Step-by-step explanation:

<u>Top base:</u>

  • a = 6 units

<u>Left leg:</u>

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<u>Bottom base:</u>

  • d = 12 units

<u>Right leg:</u>

  • c² = √6²+8² = √100
  • c = 10 units

<u>Perimeter:</u>

  • P = 6 + 8 + 10 + 12 = 36 units
7 0
3 years ago
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