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- A cylindrical pipe 5 metres long has an internal diameter 28 millimetres and an external diameter of 42 millimetres.
The density of the material that makes...(Solved)
A cylindrical pipe 5 metres long has an internal diameter 28 millimetres and an external diameter of 42 millimetres.
The density of the material that makes the pipe is 1.45g/cm³. Calculate the mass of the pipe in kilograms.(take pi =22/7)
Date posted: April 25, 2019. Answers (1)
- The mass of two similar solid are 324g and 768g. Find
(Solved)
The mass of two similar solid are 324g and 768g. Find
(a) height of the smaller solid if the height of the bigger solid is 20cm.
(b) the surface area of the smaller solid if the surface area of the bigger solid is 40cm².
Date posted: April 25, 2019. Answers (1)
- (a) Express 1050 in terms of its prime factors.
(b) Determine the smallest positive number such that 1050p is a perfect square.(Solved)
(a) Express 1050 in terms of its prime factors.
(b) Determine the smallest positive number such that 1050p is a perfect square.
Date posted: April 25, 2019. Answers (1)
- A basket ball team play 10 matches in a tournament. The following are scores in each match.
9, 15, 17, 16, 7, 20, 21, 15, 10,...(Solved)
A basket ball team play 10 matches in a tournament. The following are scores in each match.
9, 15, 17, 16, 7, 20, 21, 15, 10, 12.
Determine:
(a) the mode.
(b) the median.
Date posted: April 25, 2019. Answers (1)
- Evaluate te expression shown below(Solved)
Evaluate:
Date posted: April 25, 2019. Answers (1)
- Two variables A and B are connected by the equation.
A = kBn
(Solved)
Two variables A and B are connected by the equation.
A = kBn
Where k and n are constants.
The table below gives values of A and B
(b) On square paper draw a suitable straight line graph to represent the relation in (a) above (scale 1cm to represent 0.1 units on both axis)
(c) Use your graph to estimate the values of k and n in to one decimal place.
Date posted: April 24, 2019. Answers (1)
- (a) Using a ruler and compasses only, construct triangle ABC such that AB = AC = 4.3cm and angle ABC = 300.(Solved)
(a) Using a ruler and compasses only, construct triangle ABC such that AB = AC = 4.3cm and angle ABC = 300.
(b) Measure BC
(c) A point p is always on the same side of BC as A. Draw the points of P such that angle BAC is always twice
angle BPC.
(d) Drop a perpendicular from A to meet BC at D. Measure AD.
(e) Calculate the area of triangle ABC.
Date posted: April 24, 2019. Answers (1)
- In the figure above, OPQ is a triangle in which;(Solved)
Date posted: April 24, 2019. Answers (1)
- Veterinary researchers were experimenting with a new drug on fowls in a research station. A sample of fowls which were known to have the disease...(Solved)
Veterinary researchers were experimenting with a new drug on fowls in a research station. A sample of fowls which were known to have the disease was used. In this sample 30 fowls were treated with the drug and the remaining 18 fowls were not treated.
(a) Calculate the probability that a fowl selected at random from the sample is
(i) treated with the drug
(ii) not treated with the drug
(b) The probability that a fowl treated with the drug will die is 1/10
, while the probability that one which is not
treated will die is 7/10
Calculate the probability that a fowl picked at random from the sample is
(i) treated with the drug and will die
(ii) not treated with the drug and will die
(iii) treated with the drug and will not die
(iv) not treated with the drug and will not die
Date posted: April 24, 2019. Answers (1)
- Two towns on the earth’s surface are located at P (070N,300E) and Q (130S,300E). A pilot plans to fly from P to Q the shortest...(Solved)
Two towns on the earth’s surface are located at P (070N,300E) and Q (130S,300E). A pilot plans to fly from P to Q the shortest route between the two towns.
(a) Calculate the shortest distance between P and Q in km.
(b) Find the distance in nautical miles (nm)
(c) The speed of the aircraft is 360 knots. Determine how long it takes to fly from P to Q.
Date posted: April 24, 2019. Answers (1)
- The figure below shows the position of a boat Q which is observed sailing directly towards the pier P at the base of a
vertical cliff...(Solved)
The figure below shows the position of a boat Q which is observed sailing directly towards the pier P at the base of a
vertical cliff PT. The angle of elevation of the top of the cliff from Q is 25.40. After 14 seconds the boat is at point R, and the angle for elevation of T is now 64.70.
If the cliff is 50m high, calculate
(a) The distance PQ
(b) The distance QR
(c) The speed of the boat in km/h
Date posted: April 24, 2019. Answers (1)
- Under a transformation represented by a matrix m a point p (x, y) is mapped onto PI, (xI,yI) where(Solved)
Under a transformation represented by a matrix m a point p (x, y) is mapped onto PI, (xI,yI) where
(a) Write down the matrix for m. (2 Marks)
(b) Find the inverse of m.
(c) The points AI (16,-2) BI (-8, 1), CI (8,-1) and DI (9,-8) are the images of A, B, C and D respectively under M.
Determine the coordinates of A, B, C and D.
Date posted: April 24, 2019. Answers (1)
- Kennedy bought three cows and twenty-five goats spending a total of Sh. 75000. If he had bought two cows and thirty three goats, he would...(Solved)
Kennedy bought three cows and twenty-five goats spending a total of Sh. 75000. If he had bought two cows and thirty three goats, he would have saved Sh. 5400. Kennedy later sold all his animals at a profit of 40% per cow and 50% per goat.
Determine;
(a) the cost at which he bought each animal.
(b) the total amount of money Kennedy received after selling all the animals.
Date posted: April 24, 2019. Answers (1)
- A particle starts from 0 and moves in a straight line so that its velocity V ms-1 after t seconds is given by
v =...(Solved)
A particle starts from 0 and moves in a straight line so that its velocity V ms-1 after t seconds is given by
v = 3t – t2. The distance of the particle from 0 at time t seconds is s metres.
(a) Express s in terms of t and c where c is a constant.
(b) Calculate the time taken before the particle returns to 0.
Date posted: April 24, 2019. Answers (1)
- The gradient function of a curve is given by(Solved)
The gradient function of a curve is given by 
Determine;
(a) the equation of the curve given the curve passes through point (0,3)
(b) the coordinates of the turning point of the curve.
Date posted: April 24, 2019. Answers (1)
- Given the column vectors.(Solved)
Given the column vectors.
express p as a column vector and hence calculate its magnitude to 3 significant figures.
Date posted: April 24, 2019. Answers (1)
- Make x the subject of the equation.(Solved)
Make x the subject of the equation.
Date posted: April 24, 2019. Answers (1)
- Wambua invested Sh. 6400 at 15% per annum compound interest for 3 years. Muinde invested twice that amount at 12.5% per annum simple interest for...(Solved)
Wambua invested Sh. 6400 at 15% per annum compound interest for 3 years. Muinde invested twice that amount at 12.5% per annum simple interest for the same period of time. Find whose investment earned more interest and by how much.
Date posted: April 24, 2019. Answers (1)
- Solve the simultaneous equation.(Solved)
Solve the simultaneous equation.
Date posted: April 24, 2019. Answers (1)
- The figure below shows a circle centre O and AOC is a straight line. PB is a tangent to the circle at and angle PBC...(Solved)
The figure below shows a circle centre O and AOC is a straight line. PB is a tangent to the circle at and angle PBC = 350.
Giving reasons for each answer, find the size of
(a) Angle BDC
(b) Angle ACB
Date posted: April 24, 2019. Answers (1)