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TiliK225 [7]
2 years ago
15

The distance between the two points P (15,x)and Q(x,-5)is 20.

Mathematics
1 answer:
Travka [436]2 years ago
6 0

Answer:

x = - 5, x = 15

Step-by-step explanation:

Assuming you require to find the values of x

Calculate the distance PQ using the distance formula and equate to 20

d = \sqrt{(x_{2}-x_{1})^2+(y_{2}-x_{1})^2    }

with (x₁, y₁ ) = P (15, x ) and (x₂, y₂ ) = Q (x, - 5 )

PQ = \sqrt{(-5-x)^2+(x-15)^2} = 20 ( square both sides )

(- 5 - x)² + (x - 15)² = 20² ← expand factors on left side using FOIL

25 + 10x + x² + x² - 30x + 225 = 400

2x² - 20x + 250 = 400 ( subtract 400 from both sides )

2x² - 20x - 150 = 0 ( divide through by 2 )

x² - 10x - 75 = 0

consider the factors of the constant term (- 75) which sum to give the coefficient of the x- term (- 10)

the factors are - 15 and + 5 , since

- 15 × 5 = - 75 and - 15 + 5 = - 10 , then

(x - 15)(x + 5) = 0

equate each factor to zero and solve for x

x + 5 = 0 ⇒ x = - 5

x - 15 = 0 ⇒ x = 15

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Z = (X-Mean)/SD 
<span>z1 = (165 - 150)/15 = +1 </span>
<span>z2 = (135 - 150)/15 = - 1 </span>
<span>According to the Empirical Rule 68-95-99.7 </span>
<span>Mean +/- 1SD covers 68% of the values </span>
<span>100% - 68% = 32% </span>
<span>The remaining 32% is equally distributed below z = - 1 and z = +1 </span>
<span>32%/2 = 16% 
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<span>Therefore, 
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<span>a) Number of men weighing more than 165 pounds = 16% of 1000 = 160 </span>
<span>b) Number of men weighing less than 135 pounds = 16% of 1000 = 160</span>
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