A piece of wire of length 80 cm is bent into the shape of a circle. When the wire is heated, its length increases at a rate of 0.2 cm s . (a) Hitung kadar perubahan jejari bulatan itu. Calculate the rate of change of the radius of the circle. [b) marks] (beterusnya, hitung jejari bulatan itu selepas wayar itu dipanaskan selama 4 saat. [4ence, calculate the radius of the circle after the wire is heated for 4 seconds. [4 marks] [Guna/Use \( \pi=3.142] \) Jawapan / Answer:

Extinction : Temporary sharp increase of strength of behavior

1) \( B \triangle A B C, A C=12 \mathrm{cu}, \quad B C=9 \mathrm{~cm}, \angle C=120^{\circ} \) \( A B- \) ?

C. 4 vacas șe comen 32 kg de pasto en 8 días. ¿Cuántas vacas se pueden alimentar con 50 kg de pasto en 10 días?

2uestion 5 ( 6 marks) (a) Find the pament necossary to amortize R2500; \( 8 \% \) compounded quarterly; 6 quarterly pamentx.

Mr Pretorius starts an investment with a deposit of R60 000 . Three years later he deposits another R40 000. Exactly 4 years after he started the investment, he withdraws R15 000 . F the first 3 years, interest is calculated at 5,5\% p.a. compounded semi-annually and thereafte it is calculated at \( 6 \% \) p.a, compounded quarterly. What is the value of the investment exactl 5 years after the first deposit?