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igor_vitrenko [27]
2 years ago
8

State A is in the shape of a rectangle with a perimeter of 1268 mi. The width is 90 mi less than the length. Find the length and

the width.
Mathematics
2 answers:
Agata [3.3K]2 years ago
6 0

The length and width of the rectangle is 362 m and 272 m respectively.

Step-by-step explanation:

Let the length be  "x m".

then the width = x - 90 m

Perimeter = 2 x (length + width) ------------------------------(1)

Substituting Length and width value in the above equation (1), we get,

2 x (x+x-90) = 1268

or, 2x - 90 = 1268/2

or, 2x - 90 = 634

or, 2x = 634 + 90

or, 2x = 724

or, x = 724/2

= 362

Thus the length  = 362 m

width = 362 - 90 m =  272 m

ahrayia [7]2 years ago
4 0

Answer:

length = 362 mi

width = 272 mi

Step-by-step explanation:

Perimeter = 2(length + width)

width = length-90 = L-90

1268 = 2(L + (L-90))

1268/2 = 2L-90

634 = 2L-90

2L = 724

L = 362

width = 362-90 = 272

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Simplify ((-3)^2)^3 A. (3)^5 B. (-3)^6 C.(3)^6 D.(-3)^5
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Answer:

B

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(x^{m})^{n}=x^{m*n}=x^{mn}

((-3)^{2})^{3}=(-3)^{2*3}=(-3)^{6}

4 0
3 years ago
Seven balls are randomly withdrawn from an urn that contains 12 red, 16 blue, and 18 green balls. Find the probability that (a)
UNO [17]

Answer:

a) P=0.226

b) P=0.6

c) P=0.0008

d) P=0.74

Step-by-step explanation:

We know that the seven balls are randomly withdrawn from an urn that contains 12 red, 16 blue, and 18 green balls. Therefore, we have 46 balls.

a) We calculate the probability that are 3 red, 2 blue, and 2 green balls.

We calculate the number of possible combinations:

C_7^{46}=\frac{46!}{7!(46-7)!}=53524680

We calculate the number of favorable combinations:

C_3^{12}\cdot C_2^{16}\cdot C_2^{18}=660\cdot 120\cdot 153=12117600

Therefore, the probability is

P=\frac{12117600}{53524680}\\\\P=0.226

b) We calculate the probability that are at least 2 red balls.

We calculate the probability  withdrawn of 1 or none of the red balls.

We calculate the number of possible combinations:

C_7^{46}=\frac{46!}{7!(46-7)!}=53524680

We calculate the number of favorable combinations: for 1 red balls

C_1^{12}\cdot C_7^{34}=12\cdot 1344904=16138848

Therefore, the probability is

P_1=\frac{16138848}{53524680}\\\\P_1=0.3

We calculate the number of favorable combinations: for none red balls

C_7^{34}=5379616

Therefore, the probability is

P_0=\frac{5379616}{53524680}\\\\P_0=0.1

Therefore, the  the probability that are at least 2 red balls is

P=1-P_1-P_0\\\\P=1-0.3-0.1\\\\P=0.6

c) We calculate the probability that are all withdrawn balls are the same color.

We calculate the number of possible combinations:

C_7^{46}=\frac{46!}{7!(46-7)!}=53524680

We calculate the number of favorable combinations:

C_7^{12}+C_7^{16}+C_7^{18}=792+11440+31824=44056

Therefore, the probability is

P=\frac{44056}{53524680}\\\\P=0.0008

d) We calculate the probability that are either exactly 3 red balls or exactly 3 blue balls are withdrawn.

Let X, event that exactly 3 red balls selected.

P(X)=\frac{C_3^{12}\cdot C_4^{34}}{53524680}=0.57\\

Let Y, event that exactly 3 blue balls selected.

P(Y)=\frac{C_3^{16}\cdot C_4^{30}}{53524680}=0.29\\

We have

P(X\cap Y)=\frac{18\cdot C_3^{12} C_3^{16}}{53524680}=0.12

Therefore, we get

P(X\cup Y)=P(X)+P(Y)-P(X\cap Y)\\\\P(X\cup Y)=0.57+0.29-0.12\\\\P(X\cup Y)=0.74

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