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navik [9.2K]
2 years ago
14

Rick used a stick to trace a large rectangle in a sandy lot

Mathematics
2 answers:
konstantin123 [22]2 years ago
8 0

Answer:

56 feet

Step-by-step explanation:

Perimeter is what the sum of all sides lengths of a polygon is. So if the retangle measures 13x15 feet, the perimeter would be 13+13+15+15. Because the 13x15 is only two sides, and a retangle has 4 sides. So we need to incorperate the other two sides, which are the same as the others because it is a retangle.

Hope this helps!

Finger [1]2 years ago
4 0

Answer:

56

Step-by-step explanation:

P = 2(L + W)

L =15

W = 13

P = 2 ( 15 + 13)

P = 2 (28)

P = 56

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(D)E[ X ] =np.

Step-by-step explanation:

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x\left(\begin{array}{c}n\\x\end{array}\right)= \frac{xn!}{x!(n-x)!}=\frac{n!}{(x-)!(n-x)!}=\frac{n(n-1)!}{(x-1)!((n-1)-(x-1))!}=n\left(\begin{array}{c}n-1\\x-1\end{array}\right)

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E(X)=np\sum_{k=0}^{n}n\left(\begin{array}{c}n-1\\k\end{array}\right)p^{k}(1-p)^{(n-1)-k}

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E[ X ] = (np) (p +(1 - p))^{n -1 }= np.

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