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2 years ago

¿Cómo se dice 2021 en números romanos?

Mathematics

2 answers:

nikitadnepr [17]2 years ago

4 0

La respuesta es MMXXl

Harrizon [31]2 years ago

4 0

Answer:

MMXXI Hope this helps :)

Step-by-step explanation:

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Please help with math (30 points)

ikadub [295]

Here we have some problems about circles, the solutions are:

a) 490.6 yd^2
b) x = 15
c) x = 27

<h3>How to find the area of a circle?</h3>

We know that for a circle of diameter D, the area is given by:

A = pi*(D/2)^2

where pi = 3.14

In the image we can see that the diameter of the circle is 25 yd, replacing that in the area equation we get:

A = 3.14*(25yd/2)^2 = 490.6 yd^2

<h3>How to find the value of x?</h3>

<u>For the second image</u>, each line creates two 180° angles. So, if we look at the tilted line, we can see that it is divided in two angles, one of 37° and the other that depends of x, so we can write:

180° = 37° + (9x + 8)°

180° - 37° - 8° = (9x)°

135°/9° = x = 15

So the value of x is 15.

For the last image:

Notice that we have a 90° angle denoted, then <u>the other 3 sections must add up to 270°.</u>

270° = 54° + (2x + 21)° + (5x + 6)°

Now we solve this for x:

270 - 54 - 21 - 6 = 2x + 5x

189 = 7x

189/7 = x = 27

x is equal to 27

If you want to learn more about circles, you can read:

brainly.com/question/25306774

8 0

1 year ago

Aerobics classes class $153.86 for 14 sessions. What is the fee for six sessions?

Brrunno [24]

153.86/14=10.99

10.99*6=$65.94

4 0

2 years ago

A building is 4,500 feet tall while the scale model of the mountain is 15 inches tall. What is the scale factor?

Natasha_Volkova [10]

Answer:

I think it is 300.

Step-by-step explanation:

5 0

2 years ago

Dahasolnce [82]

Answer:

Step-by-step explanation:

ΔADE & ΔABC are similar triangles.

$\frac{AD}{AB}=\frac{DE}{BC}\\\\\frac{12}{4}=\frac{12}{x}\\$

Cross multiply,

12*x = 12*4

$x= \frac{12*4}{12}\\$

x = 4

6 0

2 years ago

A data set includes data from student evaluations of courses. The summary statistics are nequals83, x overbarequals3.32, sequa

Andrews [41]

Answer:

Hypothesis

Null hypothesis: $\mu =3.50$

Alternative hypothesis: $\mu \neq 3.50$

Statistic

$t=\frac{3.32-3.50}{\frac{0.56}{\sqrt{83}}}=-2.928$

P value

The degrees of freedom are given by:

$df=n-1=83-1=82$

And the p value would be given by:

$p_v =2*P(t_{(82)}$

Conclusion

Since the p value is lower than the significance level of 0.05 we have enough evidence to reject the null hypothesis and we can conclude that the true mean is significantly different from 3.5

Step-by-step explanation:

Information given

$\bar X=3.32$ represent the sample mean

$s=0.56$ represent the sample deviation

$n=83$ sample size

$\mu_o =3.5$ represent the value to test

t would represent the statistic

$p_v$ represent the p value

System of hypothesis

We want to verify if the true mean is equal to 3.5, the system of hypothesis are:

Null hypothesis: $\mu =3.50$

Alternative hypothesis: $\mu \neq 3.50$

Statistic

The statistic would be given by:

$t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

Replacing we got:

$t=\frac{3.32-3.50}{\frac{0.56}{\sqrt{83}}}=-2.928$

P value

The degrees of freedom are given by:

$df=n-1=83-1=82$

And the p value would be given by:

$p_v =2*P(t_{(82)}$

Conclusion

Since the p value is lower than the significance level of 0.05 we have enough evidence to reject the null hypothesis and we can conclude that the true mean is significantly different from 3.5

8 0

2 years ago

¿Cómo se dice 2021 en números romanos?​

¿Cómo se dice 2021 en números romanos?