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2015 HSC Mathematics Solutions (1 Viewer)

I97

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Think the following aren't correct:
- 13b ii) Region shaded only in the first and second quadrants
- 14a ii) You have to subtract the 41.55 from 110
 

keepLooking

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For 14 (a) ii), Since it is distance fallen, shouldn't it be 110 - 41.55?
 

ymcaec

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Yep! I have changed 14a ii (didnt read the question lol)
But for 13b ii) - the first inequality will include the rectangular bit below the semicircle. Pick (0, -1) and put that in the inequality -- -1 <= sqrt(9-0^2) which is true.
 

maysilees

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Yep! I have changed 14a ii (didnt read the question lol)
But for 13b ii) - the first inequality will include the rectangular bit below the semicircle. Pick (0, -1) and put that in the inequality -- -1 <= sqrt(9-0^2) which is true.
isnt it something about how the range for the semi circle is 0 < y< 3?
 

akkatracker

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In 16c the line where you sub into the 2nd derivative I believe you have an R where you shouldn't. May be wrong though (late at night)
 

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