4. Terdapat 10 buah jam di dalam sebuah kotak 4 daripadanya telah rosak. Jika dua buah jam diambil satu demi satu daripada kotak itu, cari kebarangkalian bahawa There are 10 clochs in a box. 4 of them are spoilt. If two clocks are drawn one by one from the box, find the probability that b) To tal Spic \( \frac{21}{\text { (a }}+\frac{24}{90}= \) (a) kedua-dua buah jam itu berada dalam keadaan baik. both clocks are in good condition. \( (6 / 10)(4 / 9) \) (b) sebuah jam telah rosak. one cloch is spoilt.

Kevin asked his trainee, Anna, to help call some of his clients to sell a newly- issued municipal bond. If he had to call all of the clients himself, it would take Kevin 6 hours to complete the job. If Anna alone were to call the clients, it would take her 9 hours. Working together, how long will it take Kevin and Anna to call all of the clients? a.) 2.8 hours b.) 3.6 hours c.) 4.5 hours d.) 3.0 hours

Write the following expression in factored form. \( \begin{array}{l}9 x^{2}+17 x-2 \\ (9 x-1)(x+2) \\ (9 x+1)(x-2) \\ (3 x-1)(3 x+2) \\ (3 x+1)(3 x-2)\end{array} \)

Evaluate the expression. \[ |1-2 x|+4 y^{2} \text { if } x=9 \text { and } y=3 \]

(a) A culture that has Po number of Acinetrbacter baumannii babteria. At \( t=1 \) hour, the number of bactena is measured to be \( 4 / 3 P_{0} \). 4 the rate of growth is proportional to the number of bacteria \( P(t) \) present at time \( t \), determine the time necescary for the number of becteria to quadrunple.

Siven : pis the midpoint of \( \overline{Q J} \) \( Q P=4 x+5 \) \( P T=6 x-17 \) Find \( : Q P= \) \( P I= \) \( Q I= \)