Simplify                                                                        (2marks)

In Boresha Bank customers may withdraw cash through one of the three tellers at the counter. On average, one teller takes 3 minutes, the others take 5 minutes and 6 minutes respectively to serve a customer. If the three tellers start to serve the customers at the same time, find the shortest time it takes to serve 210 customers.              (4 marks)

Evaluate without using a calculator                           (3 marks)

(a) Complete the table below for y = x³ + 4x² – 5x - 5                                                          (2 Marks)

(b) On the grid provided, draw the graph of y = x³ + 4x² – 5x – 5 for                   (3 Marks)

(c)  i) Use the graph to solve the equation  x³ + 4x² – 5x – 5 = 0                                               (2 Marks)

ii) By drawing a suitable straight line on the graph, solve the equation                               (3 Marks)

      x³ + 4x² – 5x – 5 = -4x - 1

The figure below shows a circle centre O, PQRS is a cyclic quadrilateral and QOS is a straight line.

Giving reasons for your answers, find the size of

(a) Angle PRS                                                        (2 Marks)

(b) Angle POQ                                                             (2 Marks)

(c) Angle QSR                                                          (3 Marks)

(d) Reflex angle POS                                                            (3 Marks)

In the figure below M and N are points on OQ and QP such that OM:MQ = 2:3 and QN : NP = 2:1. ON and PM intersect at X.

(a) Given that OP = p and OQ = q. Express in terms of p and q

i) ON                                                                    (2 Marks)

(ii) PM                                                                             (2 Marks)

(b) Given that OX = hON and PX = kPM where h and k are scalars,

(i) Determine the values of h and k.                                 (5 Marks)

(ii) Determine ratio in which X divides PM.                                    (1 Mark)

A tank has two inlet taps P and Q and an outlet tap R. When empty, the tank can be filled by tap P alone in 4¹/₂  hour or by tap Q alone in 3 hours. When full, the tap can be emptied in 2 hours by tap R.

(a) The tank is initially empty. Find how long it would take to fill up the tank

i) If tap R is closed and taps P and Q are opened at the same time.                      (2 Marks)

ii) If all the three taps are opened at the same time.                                       (2 Marks)

(b) The tank is initially empty and the three taps are opened as follows:-

P at 8.00 a.m.

Q at 8.45 a.m

R at 9.00 a.m

i) Find the fraction of the tank that would be filled by 9.00 a.m              (3 Marks)

ii) Find the time the tank would be fully filled up                                     (3 Marks)

Three consecutive terms of a geometric progression are 3^2x+1 , 9x and 81  respectively.

(a) Calculate the value of x                                        (3 Marks)

(b) Find the common ratio of the series.                                       (1 Mark)

(c) Calculate the sum of the first 4 terms of this series.                               (3 Marks)

(d) Given that the fifth and the seventh terms of the G.P form the first two consecutive terms of an arithmetic sequence, calculate the sum of the first 20 terms of the sequence.                    (3 Marks)

James’ earning are as follows:-

Basic salary Sh. 38,000 p.m

House allowance Sh. 14,000 p.m

Travelling allowance Sh. 8,500 p.m

Medical allowance Sh. 3,300

The table for the taxable income is as shown below.

(a) Calculate James’ taxable income in K£ p.a.                                (2 Marks)

(b) Calculate James’s P.A.YE if he is entitled to a tax relief of Sh. 18000 p.a.              (4 Marks)

(c) James is also deducted the following per month:-

NHIF                           Sh. 320

Pension scheme          Sh. 1000

Co-operative shares    Sh. 2000

Loan repayment          Sh. 5000

Interest on loan           Sh. 500

(i) Calculate James’ total deduction per month in KSh.                   (2 Marks)

(ii) Calculate his net salary per month                                                 (2 Marks)

Matrix P is given by    

(a) Find P^-1                                  (2 Marks)

(b) Two institutions, Katulani High School and Nthia High School purchased beans at Sh. b per bag and maize at Sh. m per bag. Katulani purchased 8 bags of beans and 14 bags of maize for KSh. 47,600. Nthia purchased 10 bags of beans and 16 bags of maize for KSh. 57,400.

(i) Form a matrix equation to represent the information above.              (2 Marks)

(ii) Use matrix  P^-1 to find the prices of one bag of each item.                 (3 Marks)

(c) The price of beans later went up by 5% and that of maize remained constant. Katulani bought the same quality of beans but spent the same total of money as before on the two items. State the new ratio of beans to maize.                                             (3 Marks)