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3 years ago

Photo attached! 15 points! Thank you in advance!!

Mathematics

1 answer:

adoni [48]3 years ago

7 0

Result x= 4 (D) and x = -3 (F). You should follow these steps:

X² + 4x - 9 = 5x +3 => X² + 4x - 5x - 9 = 3 => X² - x - 9 -3 = 0

Base on (a +b)² = a² + 2ab + b² and (a+b)² = value => a+b = +/- Value so

X² - x - 9 -3 = 0 => X² - x - 12 = 0 => X² - 2x.1/2 + 1/2² - 1/2² - 12 = 0

(X -1/2)² - 1/4 - 12 = 0 => (X-1/2)² - 1/4 - 48/4 = 0 => (X-1/2)² = 49/4

(x-/12) = +/- 7/2 So x -1/2 = 7/2 or x -1/2 = -7/2

And result is x = 8/2 = 4 or x = -6/2 = -3

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Greeley [361]

Answer:

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Step-by-step explanation:

Step 1: Write equation

-4(3/2x - 12) = -15

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guajiro [1.7K]

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The null hypothesis is $H_o : \sigma^2_1 = \sigma^2 _2$

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The alternative hypothesis is $H_a : \sigma_1 ^2 > \sigma^2_2$

Generally from the F statistics table the critical value of $\alpha = 0.05$ at first and second degree of freedom $df_1 = n_1 - 1 = 30 - 1 = 29$ and $df_2 = n_2 - 1 = 30 - 1 = 29$ is

$F_{critical} = 1.8608$

Generally the test statistics is mathematically represented as

$F = \frac{s_1^2 }{s_2^2}$

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Generally from the value obtained we see that $F > F_{critical }$ Hence

The decision rule is

Reject the null hypothesis

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There is sufficient evidence to support the researchers claim

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2 years ago

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3 years ago

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Harman [31]

First, let's list the lengths of the sides in descending order.

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We are looking for c which corresponds to 18.

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3 years ago

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