Before you use the quadratic formula, you have to make sure the equation itself is a quadratic and that a and b are not 0.
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I don't see the polygon but all you need to do is add up all the sides.
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Step-by-step explanation:
Given : In a study investigating a link between walking and improved health, researchers reported that adults walked an average of 873 minutes in the past month for the purpose of health or recreation.
Claim : The true average number of minutes in the past month that adults walked for the purpose of health or recreation is lower than 873 minutes.
i.e. 
We know that the null hypothesis contains equal sign , then the set of hypothesis for the given situation will be :-
I think n2+2
and i don’t really know how to explain
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I'm pretty sure the answer is E