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kumpel [21]
2 years ago
15

I need help!!!! The square below has the given side lengths. x is positive

Mathematics
2 answers:
Allisa [31]2 years ago
7 0

Answer:

See below, please

Step-by-step explanation:

This square

3 {x}^{2}  + 6x + 7 = 2 {x}^{2}  - 2x + 27

(3 {x}^{2}  - 2 {x}^{2} ) + (6x  +  2x) + (7 - 27) = 0

{x}^{2}  + 8x - 20 = 0

(x + 10) \times (x - 2) = 0

Hence,

x1 =  2

x2 =  - 10

Because x is positive, So,

x = 2

Then we know

The length of one of the sides

= 3 {x}^{2}  + 6x + 7 = (3 \times  {2}^{2})  + (6 \times 2) + 7 = (3 \times 4) + 12 + 7 = 31

The area of the square

=  {31}^{2}  = 961

The perimeter of the square

= 31 \times 4 = 124

Hoochie [10]2 years ago
5 0

Answer:

Value of X: X=2

Length of One Side: 31

Area: 961u^2

Perimeter: perimeter = 124

Step-by-step explanation:

Set the sides equal to each other, simplify and then use quadratic equation. One result is positive and the other is negative, shape's sides have to be positive so use the positive value for X.

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he amount of time that a customer spends waiting at an airport check-in counter is a random variable with mean 8.3 minutes and s
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Complete question:

He amount of time that a customer spends waiting at an airport check-in counter is a random variable with mean 8.3 minutes and standard deviation 1.4 minutes. Suppose that a random sample of n equals 47 customers is observed. Find the probability that the average time waiting in line for these customers is

a) less than 8 minutes

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Answer:

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b) 0.9291

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Step-by-step explanation:

Given:

n = 47

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s.d = 1.4 mins

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P(X' < 7.5) = P(Z< -3.92)

NORMSDIST (-3.92)

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