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3 years ago

Please help me im confused

Mathematics

2 answers:

slava [35]3 years ago

6 0

Hello, the answer is 0

frosja888 [35]3 years ago

3 0

Answer:

Simplifying

7r + -7r = 0

Combine like terms: 7r + -7r = 0

0 = 0

Solving

0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

Step-by-step explanation:

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It costs $35 per hour to rent a boat at the lake. You also need to pay a $25 fee for safety equipment. You have $200. For how lo

IrinaVladis [17]

$25 + $35x = $200
$35x = $175 (subtracted the 25)
x = 5 hours (divided the 35)

So you could rent the boat for 5 hours.

3 0

3 years ago

A study finds that college students found it unpleasant to sit alone and think.1 The same article describes a second study in wh

Alisiya [41]

Answer:

Assuming a confidence level of 95%.

For the 95% confidence interval the value of $\alpha=1-0.95=0.05$ and $\alpha/2=0.025$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=1.96$

The standard error for this case is given by: $SE= 0.154$

$(0.667-0.25) - 1.96*0.154=0.115$

$(0.667-0.25) + 1.96*0.154=0.719$

And the 95% confidence interval for the difference of the two proportions would be given (0.115;0.719).

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$p_A$ represent the real population proportion for brand A

$\hat p_A =\frac{12}{18}=0.667$ represent the estimated proportion for male

$n_A=18$ is the sample size required for male

$p_B$ represent the real population proportion for female

$\hat p_B =\frac{6}{24}=0.25$ represent the estimated proportion for female

$n_B=24$ is the sample size required for female

$z$ represent the critical value for the margin of error

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

Solution to the problem

The confidence interval for the difference of two proportions would be given by this formula

$(\hat p_A -\hat p_B) \pm z_{\alpha/2} \sqrt{\frac{\hat p_A(1-\hat p_A)}{n_A} +\frac{\hat p_B (1-\hat p_B)}{n_B}}$

Assuming a confidence level of 95%.

For the 95% confidence interval the value of $\alpha=1-0.95=0.05$ and $\alpha/2=0.025$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=1.96$

The standard error for this case is given by: $SE= 0.154$

And replacing into the confidence interval formula we got:

$(0.667-0.25) - 1.96*0.154=0.115$

$(0.667-0.25) + 1.96*0.154=0.719$

And the 95% confidence interval for the difference of the two proportions would be given (0.115;0.719).

7 0

3 years ago

Ariana invested $7500 in an account paying in interest rate of 2.9% compounded continuously assuming no deposits or withdrawals

Korvikt [17]

Answer:

11260

Step-by-step explanation:

it is right

7 0

3 years ago

Read 2 more answers

Write an equivalent expression for -5(8-2x)

ololo11 [35]

-40-10x (I think, sry if it’s wrong)

5 0

3 years ago

Haddie wrote a check to the grocery store for $156.00. However, when she looks at her check register later that night, she sees

evablogger [386]

Haddie wrote a check to the grocery store for $156.00. And turns out to only become 122.66 dollars the time she checked it later that night.Now, when she checked it in her banks, I believe there are fees charged to her written check. Now, let's find out how much will that be:=> 156 dollarss to 122.66 dollars=> 33.34 dollars=> 33.34 / 156 =0.21=> 0.21 * 100% = 21%<span>Thus, the bank opted 21% of her written check</span>

5 0

3 years ago