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4 years ago

Re-write the expression below.will award brainliest(PLEASE HELPP)

Mathematics

1 answer:

Sedbober [7]4 years ago

8 0

Answer:

- 2a² - 5a + 4ab - 2b + b²

Step-by-step explanation:

Distributing the parenthesis gives

= - 2a² - 2ab + 10a - 15a + 6b + 6ab + b² - 8b ( collect like terms )

= - 2a² + (10a - 15a) + (- 2ab + 6ab) + (6b - 8b) + b²

= - 2a² - 5a + 4ab - 2b + b²

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coefficient of the a² term is - 2

coefficient of the ab term is + 4

coefficient of the b term is - 2

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The mayor of a town has proposed a plan for the construction of an adjoining bridge. A political study took a sample of 900 vote

Likurg_2 [28]

Answer:

Test statistic z = 2.3839.

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Step-by-step explanation:

This is a hypothesis test for a proportion.

The claim is that the percentage of residents who favor construction is above 56%.

Then, the null and alternative hypothesis are:

$H_0: \pi=0.56\\\\H_a:\pi>0.56$

The significance level is 0.05.

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$\sigma_p=\sqrt{\dfrac{\pi(1-\pi)}{n}}=\sqrt{\dfrac{0.56*0.44}{900}}\\\\\\ \sigma_p=\sqrt{0.000274}=0.017$

Then, we can calculate the z-statistic as:

$z=\dfrac{p-\pi-0.5/n}{\sigma_p}=\dfrac{0.6-0.56-0.5/900}{0.017}=\dfrac{0.039}{0.017}=2.3839$

This test is a right-tailed test, so the P-value for this test is calculated as:

$\text{P-value}=P(z>2.3839)=0.0086$

As the P-value (0.0086) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

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4 years ago

Mashutka [201]

Answer: 13 minutes

Step-by-step explanation:

( 0 + 2 + 10 + 8 + 20 + 12 + 30 + 7 + 40 + 1)/10 = 130/10 = 13

Hope this helps!

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2 years ago

What is this? I’m struggling a little with this

noname [10]

Just do every number multiplied by 4 so it would go 3,12,192,768,3072 and so and so forth

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3 years ago