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posledela
3 years ago
10

a rectanular field is 65 meters wide and 115 meters long. a coach asks players to run from one corner to the opposite corner dia

gonally across field, then run back to where they started. how far do they have to run altogether

Mathematics
1 answer:
Eddi Din [679]3 years ago
8 0

Answer:

Players ran 264.20 m altogether.

Step-by-step explanation:

Diagram is attached for reference

Given:

Length of rectangular field (BC) = 115 m

Width of rectangular field (AB) = 65 m

a coach asks players to run from one corner to the opposite corner diagonally across field.

i.e In diagram from point A to Point C

So we will first find the length of diagonal AC.

Now we know that all angles of rectangle is 90°

Hence by Pythagoras theorem we get;

AC^2=AB^2+BC^2

Substituting the value we get;

AC^2 = 115^2+65^2 = 17450

Now taking square root on both side we get;

\sqrt{AC^2} = \sqrt{17450} \\\\AC \approx 132.10\ m

Now Players run back from where they started.

So players ran = 132.10 m + 132.10 m = 264.20 m

Hence Players ran 264.20 m altogether.

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The National Transportation Safety Board publishes statistics on the number of automobile crashes that people in various age gro
ra1l [238]

Answer:

a) Null hypothesis:p\leq 0.12  

Alternative hypothesis:p > 0.12  

b) z_{\alpha}=1.64

c) z=\frac{0.134 -0.12}{\sqrt{\frac{0.12(1-0.12)}{1000}}}=1.362  

d) p_v =P(z>1.362)=0.0866  

e) For this case since the statistic is lower than the critical value and the p value higher than the significance level we have enough evidence to FAIL to reject the null hypothesis so then we don't have information to conclude that the true proportion is higher than 0.12

Step-by-step explanation:

Information given

n=1000 represent the random sample selected

X=134 represent the number of young drivers ages 18 – 24 that had an accident

\hat p=\frac{134}{1000}=0.134 estimated proportion of young drivers ages 18 – 24 that had an accident

p_o=0.12 is the value that we want to verify

\alpha=0.05 represent the significance level

Confidence=95% or 0.95

z would represent the statistic

p_v{/tex} represent the p valuePart aWe want to verify if the population proportion of young drivers, ages 18 – 24, having accidents is greater than 12%:  Null hypothesis:[tex]p\leq 0.12  

Alternative hypothesis:p > 0.12  

The statistic would be given by:

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

Part b

For this case since we are conducting a right tailed test we need to find a critical value in the normal standard distribution who accumulates 0.05 of the area in the right and we got:

z_{\alpha}=1.64

Part c

For this case the statistic would be given by:

z=\frac{0.134 -0.12}{\sqrt{\frac{0.12(1-0.12)}{1000}}}=1.362  

Part d

The p value can be calculated with the following probability:

p_v =P(z>1.362)=0.0866  

Part e

For this case since the statistic is lower than the critical value and the p value higher than the significance level we have enough evidence to FAIL to reject the null hypothesis so then we don't have information to conclude that the true proportion is higher than 0.12

8 0
3 years ago
4/5 divided by 5 1/2
irina1246 [14]

Answer:

8/55

Step-by-step explanation:

4/5 DIVIDED 5 1/2 = 8/55

6 0
3 years ago
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worty [1.4K]

Answer:

33

Step-by-step explanation:

45 is half of 90

So straight away go to 45-12

33

Hope this helps

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6 0
3 years ago
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Hello! I would love to help!

Let's start with this part of the equation: "the sum of a number and seven"

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Next, let's remember that sum means adding. So we just need to 7 to x

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2(x+7)


That's your answer! 2(x+7)


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The least common multiple of two numbers is 60, and one of the numbers is 7 less the other number. What are the numbers?
Vladimir79 [104]
5 and 12 should be the answer
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