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The table shows information about three carbon compounds:

boilingpointquestion.png

What is the best estimate for the boiling point in oC of compound Z?

 

A.

31

 

B.

101

 

C.

114

 

D.

156

08 June 2013 · JOHNSON BADZA · 2 marks · 2 mins

I have R12 000 to invest. I need the money to grow to at least R30 000. If it is invested at a compound interest rate of 13% per annum, for how long (in full years) does my investment need to grow ?

02 September 2012 · Harry Brink · 0 marks · 0 mins

I have R12 000 to invest. I need the money to grow to at least R30 000. If it is invested at a compound interest rate of 13% per annum, for how long (in full years) does my investment need to grow ?

07 August 2012 · robert chimoto · 0 marks · 0 mins

Suppose a train is approaching you as you stand on the platform at the station. As the train approaches the station, it slows down. All the while, the engineer is sounding the hooter at a constant frequency of 400 Hz. Describe the pitch and the changes in pitch that you hear.

14 December 2011 · Heather Williams · 0 marks · 0 mins

1. `lim_(x->3)(x^2-9)/(x+3)`

2. `lim_(x->3)(x+3)/(x^2+3x)`

3. `lim_(x->2)(3x^2-4x)/(3-x)`

4. `lim_(x->4)(x^2-x-12)/(x-4)`

5. `lim_(x->2)(3x+(1)/(3x))`

12 December 2011 · Alison Jenkin · 0 marks · 0 mins

Given `g(x)=-x^2`

(a) determine `(g(x+h)-g(x))/(h)`

 

(b) hence, determine `lim_(h->0) (g(x+h)-g(x))/(h)`


(c) explain the meaning of your answer in (b).

12 December 2011 · Alison Jenkin · 0 marks · 0 mins

(a) Use the factor theorem to solve the following equation for `m`:
`8m^3 + 7m^2 − 17m + 2 = 0`
(b) Hence, or otherwise, solve for `x`:
`2^(3x+3) + 7 . 2^(2x) + 2 = 17 . 2^x`

12 December 2011 · Alison Jenkin · 0 marks · 0 mins

`2x^3 − x^2 − 2x + 2 = Q(x).(2x − 1) + R` for all values of `x`.

What is the value of `R`?

12 December 2011 · Alison Jenkin · 0 marks · 0 mins

(a) Show that `x-2` is a factor of `3x^3 − 11x^2 + 12x-4`
(b) Hence, by factorising completely, solve the equation
`3x^3 − 11x^2 + 12x − 4 = 0`

12 December 2011 · Alison Jenkin · 0 marks · 0 mins

Solve for `x: 16(x + 1) = x^2 (x + 1)`

12 December 2011 · Alison Jenkin · 0 marks · 0 mins