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Taya2010 [7]
3 years ago
9

When converting measurements in the metric system, you can move the decimal point to the left or to the right. Why? Select all t

hat apply.
₋When converting from smaller to larger units, you are dividing by a power of 10.
₋Moving a decimal point is the same as adding or subtracting.
₋The metric system is based on powers of 10.
₋When converting from larger to smaller units, you are multiplying by a power of 10.
Mathematics
1 answer:
Vesnalui [34]3 years ago
5 0

You are dividing by the power of 10. The metric system is based on multiples of 10, so you can convert meters to millimeters and vice versa fairly quickly by multiplying and dividing.

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Can you guys let me know if I'm right please
MAXImum [283]

Answer:

No there are problems. Please correct the errors

1 \frac{3}{20} = \frac{23}{20} = 23:20

25\% = \frac{1}{4} = 0.25

Step-by-step explanation:

3 0
3 years ago
One of your peers claims that boys do better in math classes than girls. Together you run two independent simple random samples
JulijaS [17]

Answer:

Step-by-step explanation:

Hello!

To test if boys are better in math classes than girls two random samples were taken:

Sample 1

X₁: score of a boy in calculus

n₁= 15

X[bar]₁= 82.3%

S₁= 5.6%

Sample 2

X₂: Score in the calculus of a girl

n₂= 12

X[bar]₂= 81.2%

S₂= 6.7%

To estimate per CI the difference between the mean percentage that boys obtained in calculus and the mean percentage that girls obtained in calculus, you need that both variables of interest come from normal populations.

To be able to use a pooled variance t-test you have to also assume that the population variances, although unknown, are equal.

Then you can calculate the interval as:

[(X[bar]_1-X[bar_2) ± t_{n_1+n_2-2;1-\alpha /2} * Sa*\sqrt{\frac{1}{n_1} +\frac{1}{n_2} }]

Sa= \sqrt{\frac{(n_1-1)S^2_1+(n_2-1)S^2_2}{n_1+n_2-2} } = \sqrt{\frac{14*(5.6^2)+11*(6.7^2)}{15+12-2} }= 6.108= 6.11

t_{n_1+n_2-2;1-\alpha /2}= t_{15+12-2;1-0.05}= t_{25;0.95}= 1.708

[(82.3-81.2) ± 1.708* (6.11*\sqrt{\frac{1}{15}+\frac{1}{12}  }]

[-2.94; 5.14]

Using a 90% confidence level you'd expect the interval [-2.94; 5.14] to contain the true value of the difference between the average percentage obtained in calculus by boys and the average percentage obtained in calculus by girls.

I hope this helps!

3 0
3 years ago
If 75 percent of the employees of a certain company take a winter vacation, 40 percent take a winter and a summer vacation, and
KATRIN_1 [288]

Answer:

The answer is option A : 5%

Step-by-step explanation:

We have the following information in percentage:

Employees taking winter vacation= 75

Employees taking both winter and summer vacation= 40

Employees taking none vacation = 20

We can assume the situation as following:

Winter + Summer - Both + Neither = 100

We get;

75 + Summer - 40 + 20 = 100

So, summer = 45

45 people take vacations in summer. But 40 of them take vacation in winters too.

So, people taking vacations in summer but not winter means summer only.

This is : 45-40=5%

Therefore, the answer is option A : 5%

8 0
3 years ago
7. Which of the following is an example of a
Rom4ik [11]

The answer of 6and7 irrational number is 6.875

3 0
1 year ago
Find the lcm of 56 and 72​
Reptile [31]

Answer:

504

Step-by-step explanation:

4 0
3 years ago
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