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Inessa05 [86]
3 years ago
8

A ball rolled from Point A to Point B in 18 second at a speed of 14 m/s. IT took another 18 seconds to roll form Pint B to Pint

C at a speed of m/s. Find the total distance the ball rolled.
Mathematics
2 answers:
vaieri [72.5K]3 years ago
8 0

Answer:

d=252m, u dint put the speed it was rolling at from point B to C so I could only solve for A to B. However if you use the formula below you can find the distance from B to C and add that to A to B giving the total distance rolled.

Step-by-step explanation:

d=vt

v=14m/s

t=18s

d= vt, (14m/s)(18s)

d=252m

Mumz [18]3 years ago
8 0
D =252 m is the correct answer
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A line parallel to one side of a triangle divides the other two sides proportionally true or false?
Stella [2.4K]

Answer:

true

Step-by-step explanation:

Triangle Proportionality Theorem - 'If a line is parallel to one side of a triangle and intersects the other two sides, then it divides the other two sides proportionally'. Hence, the given statement is true

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The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airp
Kruka [31]

Answer:

6.76-2.01\frac{2.55}{\sqrt{50}}=6.03    

6.76+2.01\frac{2.55}{\sqrt{50}}=7.49    

The 95% confidence interval would be given by (6.03;7.49)    

Step-by-step explanation:

Notation

\bar X represent the sample mean

\mu population mean (variable of interest)

s represent the sample standard deviation

n=50 represent the sample size  

Solution

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

We can calculate the mean and the sample deviation we can use the following formulas:  

\bar X= \sum_{i=1}^n \frac{x_i}{n} (2)  

s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}} (3)  

The mean calculated for this case is \bar X=6.76

The sample deviation calculated s=2.55

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=50-1=49

We assume a standard confidence level of 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-T.INV(0.025,49)".And we see that t_{\alpha/2}=2.01

Now we have everything in order to replace into formula (1):

6.76-2.01\frac{2.55}{\sqrt{50}}=6.03    

6.76+2.01\frac{2.55}{\sqrt{50}}=7.49    

The 95% confidence interval would be given by (6.03;7.49)    

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3 years ago
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Answer:

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Step-by-step explanation:

The associative property of addition states that changing the grouping of the addends does not change the sum.

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-4+9= 5

(3+9)= 12

-7+12=5

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