Q16 Share your answers here (2 Viewers)

[fatima96]

yes

i skipped b)iv) cos i kept getting no solution
And c)ii) i just used similar triangles twice and left it there cos i was braindead

i kept getting no solution too! Omg.

 

[Hue Jass]

well it said 10carp are introduced into the lake so

I didn't solve it. I just derived N, and set it to dP/dt.

 

[Drongoski]

Sorry. Posted my tiny contribution elsewhere. Here it is again:

Q16(c)

Easy to show triangles AXY and ABC are similar (they are equi-angular).

Similarly for triangles BXY and BAD

.: their corresponding sides are proportional.

.: XY/AD = BX/AB

.: XY/BC = AX/AB

.: XY/AD + XY/BC = BX/AB + AX/AB = (AX + BX)/AB = AB/AB = 1

.: Dividing throughout by XY:

1/XY = 1/AD + 1/BC


QED

 

[joe_y]

spot on mate

 

[Shazer2]

How did you show similarity?

 

[dunjaaa]

My solutions for question 16 b) carp question, forgive me for my terrible handwriting

 

[hjed]

well it said 10carp are introduced into the lake so

I missed that, it that case you'd have to integrate dP/dt, get the equation for P and then sub that back in to dP/dt ... what where the marks in v for then, I assumed at least one was for integrating P?

 

[untamedkid]

so for last part of carp question I wrote 135.41, you guys thing i will get it wrong ? coz the answer is 135.4025,

 

[Samir97]

so for last part of carp question I wrote 135.41, you guys thing i will get it wrong ? coz the answer is 135.4025,

If its 50ln15 then its right though it'd be best if you left in exact form

 

[untamedkid]

did it with trial and error