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3 years ago

5

¿What is the density of a rock if it has a mass of 50 g and a volume of 10 mL?

1 answer:

yan [13]3 years ago

4 0

D=m/v so d=50/10=5

The density is 5g/ml

It might be ml^3 (5g/ml^3) but I don’t remember

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Idk how to do this I’m stuck and don’t know what to do it’s due today can someone give me the answers

wel

A: When they were distributing the 2, they didn’t distribute it to the 5. The correct answer would be 6x + 10

B: They didn’t distribute the 3 to the -3. The answer should be 6x^2 - 9

C: They didn’t distribute the -3 to the -4. The correct answer should be -9x + 12

D: The -20 should be a positive 20 because -4 x -5= 20. The correct answer should be -16x + 20

E: The 12 should be a -12 because -2 x 6= -12. The correct answer should be -8x^2 -12

F: They didn’t distribute the -9 correctly. The correct answer should be -36x^3 + 45x -54

Hope this helps!

-Grace

7 0

3 years ago

An engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such tha

BartSMP [9]

Answer:

The decision rule is

Reject the null hypothesis

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 5.6 \ pounds/inch^2$

The sample size is n = 160

The sample mean is $\= x = 5.7 \ pounds/ inch^2$

The variance is $\sigma ^2 = 0.25$

The level of significance is $\alpha = 0.01$

The null hypothesis is $H_o : \mu = 5.6$

The alternative hypothesis is $H_a : \mu > 5.6$

Generally the standard deviation is mathematically represented as

$\sigma = \sqrt{\sigma ^2 }$

=> $\sigma = \sqrt{0.25 }$

=> $\sigma = 0.5$

Generally the test statistics is mathematically represented as

$z = \frac{\= x - \mu }{ \frac{\sigma}{\sqrt{n} } }$

=> $z = \frac{5.7 - 5.6 }{ \frac{0.5 }{\sqrt{ 160 } } }$

=> $z = 2.53$

From the z table the area under the normal curve to the left corresponding to 2.53 is

$p-value = P(Z > 2.53 ) =0.0057$

From the value obtained we see that the $p-value < \alpha$ hence

The decision rule is

Reject the null hypothesis

The conclusion is

There is sufficient evidence to conclude that the believe that the valve performs above the specifications is true

5 0

3 years ago

What is an approximate average rate of change of the graph from x = 2 to x = 5, and what does this rate represent? (4 points)

son4ous [18]

Answer:

12

Step-by-step explanation:

5 0

3 years ago

Alicia's MP3 player contains 1,260 song. Given that 35% of the songs are rock songs and 20% of the songs are rap songs, how many

schepotkina [342]

1. 567
2. 33
3. 85%; $17
4. they have 4 pages left
5. (-5,2)

8 0

3 years ago

What does<br> 9 x 2/5 equal

fomenos

Answer:

3 3/5

Step-by-step explanation:

9/1*2/5=18/5

=3 3/5

3 0

3 years ago

Read 2 more answers