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3 years ago

Expand 8x - 2x + 3(-4x+9)

Mathematics

2 answers:

Trava [24]3 years ago

7 0

Answer:

x ^3 + 6 x ^2 + 12 x + 8

stiks02 [169]3 years ago

3 0

Answer:

Step-by-step explanation:

Always do parentheses first!

-4x+9=-5x

8x-2x=6x

-5x-6x+3=

x+3=4

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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An exit poll of 1000 randomly selected voters found that 515 favored measure A. a. Construct a 99% confidence interval for the s

never [62]

Answer:

Step-by-step explanation:

Given that an exit poll of 1000 randomly selected voters found that 515 favored measure A.

Sample proportion p = $\frac{515}{1000} =0.515$

$q=1-0.515 =0.485\\n =1000\\SE = \sqrt{\frac{pq}{n} } \\=0.158\\$

Margin of error 99% = 2.58*SE

= $2.58*0.0158\\=0.0408$

99% confidence interval = $(0.515-0.0408, 0.515+0.0408)\\= (0.474, 0.556)$

------------------------

$H_0: p =0.5\\H_a: p >0.5\\$

(Right tailed test)

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Test statistic Z = p diff/std error = $\frac{0.015}{0.0158} \\\\=0.9487$

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3 years ago