Simplify: (6x2 + x - 7)(4x - 6) HELPP

Mathematics

1 answer:

Mariulka [41]3 years ago

3 0

Answer:

24x^3−32x^2-34x+42

Step-by-step explanation:

Distribute 4x(6x^2+x-7) and -6(6x^2+x-7)

You get 24x^3-32x^2-34x+42-32x^2+42

Then simplify the answer by adding/subtracting each variable, since you can only simplify by like terms. And you get your answer

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A study of 4,430 U.S. adults found that 2,913 were obese or overweight. The 95% confidence interval for the proportion of adults

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Answer:

$0.658 - 1.96\sqrt{\frac{0.658(1-0.658)}{4430}}=0.644$

$0.658 + 1.96\sqrt{\frac{0.658(1-0.658)}{4430}}=0.672$

We are 95% confident that the true proportion of adults overweight is between 0.644 and 0.672

Step-by-step explanation:

We can begin founding the estimated proportion of people overweight:

$\hat p =\frac{2913}{4430}= 0.658$

We need to find a critical value for the confidence level using the normal standard distribution. We know that 95% is the confidence level, then the significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by: