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notka56 [123]
3 years ago
6

7+

Mathematics
1 answer:
Tamiku [17]3 years ago
7 0
Ok so

(-3)(5x+-13)
=(-3)(5x)+(-3)(-13)

So your answer should be A. -15x+36

Hope this helps ❤️
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8+5n is greater then or equal to 4 (n+8)
Semmy [17]
It would depend on what n was equal to
8 0
3 years ago
Read 2 more answers
What's 1+1 ??? <br><br> enjoy!
Natalija [7]
1+1= -2628474
hope it helps
5 0
2 years ago
What is 9 squared...................
Irina-Kira [14]

Answer:

81

Step-by-step explanation:

[character limit thing]

5 0
2 years ago
normally distributed with mean 24.6 seconds and standard deviation 0.64 seconds;the lower finishing time, the better. If the qua
marshall27 [118]

Answer:

z=1.04

And if we solve for a we got

a=24.6 +1.04*0.64=25.27

So the value of height that separates the bottom 85% of data from the top 15% is 25.27.  

Step-by-step explanation:

Previous concepts

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".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the finishing time of a population, and for this case we know the distribution for X is given by:

X \sim N(24.6,0.64)  

Where \mu=24.6 and \sigma=0.64

Solution to the problem

For this part we want to find a value a, such that we satisfy this condition:

P(X>a)=0.15   (a)

P(X   (b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.  

As we can see on the figure attached the z value that satisfy the condition with 0.85 of the area on the left and 0.15 of the area on the right it's z=1.04. On this case P(Z<1.04)=0.85 and P(z>1.04)=0.15

If we use condition (b) from previous we have this:

P(X  

P(z

But we know which value of z satisfy the previous equation so then we can do this:

z=1.04

And if we solve for a we got

a=24.6 +1.04*0.64=25.27

So the value of height that separates the bottom 85% of data from the top 15% is 25.27.  

3 0
3 years ago
What is 713 divided by 9 and then the quotient estimated
Murljashka [212]
713/9

79 2/9       Decimal form: 79.222

713 divided by 9 is 79 with a quotient estimate of 2. 

79 r 2


4 0
3 years ago
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