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alexdok [17]
3 years ago
7

What is the value of X?

Mathematics
1 answer:
Ugo [173]3 years ago
4 0

∆ABC similar to ∆CBD

DB/AC = CB/AB

\frac{x}{7.5}  =  \frac{7.5}{x + 3}  \\ x(x + 3) =  {7.5}^{2}  =  { (\frac{15}{2}) }^{2}  \\  {x}^{2}  + 3x =  \frac{225}{4}  \\ 4 {x}^{2}  + 12x = 225 \\ 4 {x}^{2}  + 12x + 9 = 216 \\  {(2x + 3)}^{2}  = 216 \\ 2x + 3 = 6 \sqrt{6}  \\ x =  - 1.5 + 3 \sqrt{6}

approximately 6.1485

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Answer:

a.) one sample t test

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Step-by-step explanation:

Given the sample data:

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Sample size, n = 30

Using calculator :

xbar from the data above = 79.4

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H0 : μ = 59.3

H1 : μ > 59.3

Test statistic :

(Xbar - μ) ÷ (σ/sqrt(n)

σ = 34.83

(79.4 - 59.3) ÷ (34.83/sqrt(30))

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Test statistic = 3.16

4 0
2 years ago
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The answer is a

Step-by-step explanation:

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6 0
3 years ago
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X = 18 
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5 0
3 years ago
How is doing math similar to solving problems? List at least three things that doing math and solving problems have in common.
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Answer:

Step-by-step explanation:

1. your kinda doing the same thing

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4 0
2 years ago
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A

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