All categories

3 years ago

50 Points:

Mathematics

1 answer:

Bond [772]3 years ago

6 0

The answer to this would be C because you can multiply everything by 3 and still have a consistent-dependent system.

You might be interested in

The graph shown corresponds to someone who makes

Alex

Answer:

5$ an hour

Step-by-step explanation:

look at the x-axis it says hours :)

also the line has a point on 1,5 sooo that means 5 dollars an hour

also the slope is also just 5 lol

6 0

3 years ago

Read 2 more answers

9x+7y equation or expression?

Alex777 [14]

Answer:

$\boxed{ \bold{ \huge{ \boxed{ \sf{expression}}}}}$

Explanation

An algebraic expression is made up of one or more numbers , variables and symbols of mathematical operations , such as , addition , subtraction , multiplication and division whereas An equation is an algebraic expression which involves an equal to sign.

Hope I helped!

Best regards! :D

8 0

4 years ago

Which of the following must be true if a number c is a square root of a nonnegative number b?

igor_vitrenko [27]

Answer:

Step-by-step explanation:

C is the square root of B.

8 0

3 years ago

Read 2 more answers

A civil engineer is analyzing the compressive strength of concrete. Compressive strength is approximately normally distributed w

nignag [31]

Answer:

a) $3250-1.96\frac{31.623}{\sqrt{18}}=3232.108$

$3250+1.96\frac{31.623}{\sqrt{18}}=3267.892$

So on this case the 95% confidence interval would be given by (3232.108;3267.892)

b) For this case since the value of 3270 is higher than the upper limit for the confidence interval so we can conclude that the true mean is not higher than 3270 at 5% of signficance. We can reject the claim at the significance level of 5%.

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".

$\bar X= 3250$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma^2 =1000$ represent the sample standard variance

$s = \sqrt{1000}$ represent the sample deviation

n=12 represent the sample size

Part a

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.025,0,1)".And we see that $z_{\alpha/2}=1.96$

Now we have everything in order to replace into formula (1):

$3250-1.96\frac{31.623}{\sqrt{18}}=3232.108$

$3250+1.96\frac{31.623}{\sqrt{18}}=3267.892$

So on this case the 95% confidence interval would be given by (3232.108;3267.892)

Part b

For this case since the value of 3270 is higher than the upper limit for the confidence interval so we can conclude that the true mean is not higher than 3270 at 5% of signficance. We can reject the claim at the significance level of 5%.

8 0

3 years ago

Pls help ASAP .Due Today,I will mark brainlist.

Evgesh-ka [11]

Answer:

Step-by-step explanation:

3 0

3 years ago