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3 years ago

Someone, please help me with this. Correct answers get brainiest

Mathematics

2 answers:

Phantasy [73]3 years ago

7 0

Answer:

-3

sqrt(9)

-sqrt(9)

Step-by-step explanation:

What number multiplied by itself will give you 9

3*3 =9

-3*-3 =9

sqrt(9) * sqrt(9) = sqrt(81) = 9

-sqrt(9) * -sqrt(9) = + sqrt(81) =9

bekas [8.4K]3 years ago

7 0

Answer:

$3$

$- 3$

$\sqrt 9$

$- \sqrt 9$

Step-by-step explanation:

${x}^{2} = 9 \\ \\ x = \pm \sqrt{9}\\ \\ x = - \sqrt{9}, \:x = \sqrt{9}\\ \\ x = - {3} \: \: x = {3}$

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GarryVolchara [31]

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3 years ago

What is the degree-measure of an angle travelled by the minute hand from 3:05pm to 3:50pm?

maria [59]

Answer:

270°

Step-by-step explanation:

We know that a full circle is 360°, the shape of a clock, and that the clock is divided into 12 different sections.

Our equation would be: 360 ÷ 12 = 30

3:05 is at the 1 hand and 3:50 is at the 10 hand. Subtract 1 from 10 and you get 9.

9 · 30 = 270, so our angle is 270°

I hope this helped, please mark Brainliest, thank you!

8 0

3 years ago

If there are 5 times as many cars as trucks and a total of 30 cars and trucks together how many trucks ?

chubhunter [2.5K]

Let t be the amount of trucks.
Thus 5t is the amount of cars.

t + 5t = 30
6t = 30
t = 30/6
t = 5

Therefore, there are 5 trucks

8 0

4 years ago

Read 2 more answers

Need help... post question in comments once someone answers

Ksenya-84 [330]

What's up? How can I help?

3 0

4 years ago

In a normally distributed data set a mean of 55 where 99.7% of the data fall between 47.5 and 62.5, what would be the standard d

NeX [460]

Given that normally distributed data set has a mean of 55 and 99.7% of data fall between 47.5 and 62.5.

Let s be the standard deviation of data set.

Since 99.7% data fall within 3 standard deviations of mean, z-value for 47.5 and 62.5 has an absolute value of 3.

That is |z|=3

But z= $\frac{x-mean}{standard deviation}$

Let us plugin x=47.5 and mean =55 and equate it to 3.

That is $|\frac{47.5-55}{s}| = 3$

$|\frac{-7.5}{s} | =3$

Since x is always positive ( being standard deviation), $|\frac{-7.5}{s} | = \frac{|-7.5|}{s} = \frac{7.5}{s}$

Hence $\frac{7.5}{s}= 3$

$s=\frac{7.5}{3} = 2.5$

We will get same value with 62.5 as well.

Hence standard deviation of data set is 2.5.

3 0

4 years ago