All categories

3 years ago

How many feet tall he is

Mathematics

2 answers:

Leno4ka [110]3 years ago

6 0

First multiply 1/2 x 5 = 5/2
Then subtract 5 - 5/2 = 5/2
Then simplify: 5/2 = 2 1/2

Hope this helped! If it did, please rate, thank, and if it really helped, give brainliest. Thanks! :)

TEA [102]3 years ago

5 0

2 and a half feet tall

You might be interested in

What is -c - d <br> c = -3 and d = -6

Yakvenalex [24]

Answer:

-3

Step-by-step explanation:

-(-3) = 3

-(-6) = 6

-3 - (-6) = 3

-c - d

c = -3

-3 - d

d = -6

-3 - (-6)

=-3+6

8 0

4 years ago

Read 2 more answers

What is the ratio of the width to length of a folded sheet of paper if the rectangle formed when the sheet is folded in half is

Leno4ka [110]

Would it be 2:1? I really don't know, I haven't learned that yet, sorry

7 0

3 years ago

Read 2 more answers

PLEASE HELP!!! WORTH 10 POINTS:)

s2008m [1.1K]

$The\ slope-intercept\ form:\\\\y=mx+b\\\\m-the\ slope;\ b-the\ y-intercept\ form$

$the\ slope:\\\\m=\frac{5\ miles}{1.4\ hours}=\frac{50}{14}\ mph=\frac{25}{7}\ mph\\\\so,\ therefore:\\\\\boxed{y=\frac{25}{7}x}$

5 0

3 years ago

In a study of the effect of cooling rate on the hardness of welded joints, 50 welds cooled at a rate of 10°C/s had an average Ro

Studentka2010 [4]

Answer:

a) The 95% confidence interval would be given by $-1.887 \leq \mu_1 -\mu_2 \leq 2.687$

b) No contradict the result obtained since the confidence interval contains the value 0, so we don't have enough evidence to conclude that we have a significant effect in the colling rate and the hardness.

Step-by-step explanation:

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".

$\bar X_1 =91.1$ represent the sample mean 1

$\bar X_2 =90.7$ represent the sample mean 2

n1=50 represent the sample 1 size

n2=40 represent the sample 2 size

$s_1 =6.55$ sample standard deviation for sample 1

$s_2 =4.32$ sample standard deviation for sample 2

$\mu_1 -\mu_2$ parameter of interest.

Part a

The confidence interval for the difference of means is given by the following formula:

$(\bar X_1 -\bar X_2) \pm t_{\alpha/2}\sqrt{\frac{s^2_1}{n_1}+\frac{s^2_2}{n_2}}$ (1)

The point of estimate for $\mu_1 -\mu_2$ is just given by:

$\bar X_1 -\bar X_2 =91.1-90.7=0.4$

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n_1 +n_2 -1=50+40-2=88$

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: "=-T.INV(0.025,88)".And we see that $t_{\alpha/2}=1.987$

The standard error is given by the following formula:

$SE=\sqrt{\frac{s^2_1}{n_1}+\frac{s^2_2}{n_2}}$

And replacing we have:

$SE=\sqrt{\frac{6.55^2}{50}+\frac{4.32^2}{40}}=1.325$

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

$0.4-1.987\sqrt{\frac{6.55^2}{50}+\frac{4.32^2}{40}}=-1.887$

$0.4+1.987\sqrt{\frac{6.55^2}{50}+\frac{4.32^2}{40}}=2.687$

So on this case the 95% confidence interval would be given by $-1.887 \leq \mu_1 -\mu_2 \leq 2.687$

Part b

No contradict the result obtained since the confidence interval contains the value 0, so we don't have enough evidence to conclude that we have a significant effect in the colling rate and the hardness.

3 0

3 years ago

Which angles measure is equal to the sum of the measure

Afina-wow [57]

Answer:

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles of the triangle.

<h2>Please mark me as brainliest </h2>

3 0

3 years ago