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- A pavement is of length (?? - 1)?? and width (?? - 8)??. The area of the pavement is 4.56 ??2.
a)(i) Write a quadratic equation...(Solved)
A pavement is of length (𝑥 − 1)𝑚 and width (𝑥 − 8)𝑚. The area of the pavement is 4.56 𝑚2.
a)(i) Write a quadratic equation for the area of the pavement in the form 𝑎𝑥2 + 𝑏𝑥 + 𝑐 = 0 where a, b
and c are constants.
(ii) Using the method of completing square, find the actual length and width of the pavement.
b) The pavement is covered with rectangular tiles measuring 0.4 m by 0.3 m. determine the number of tiles used to cover the pavement completely.
Date posted: November 11, 2019. Answers (1)
- Evaluate(Solved)
Evaluate 
Date posted: November 11, 2019. Answers (1)
- The original area of an object after two successive transformations given by in that order becomes 168 square units. Find the original area of...(Solved)
The original area of an object after two successive transformations given by 
in that order becomes 168 square units. Find the original area of the object.
Date posted: November 11, 2019. Answers (1)
- During inter-school competitions, rugby and football teams from Ranje sec school took part. The probability that the rugby would win their first match was 1/8...(Solved)
During inter-school competitions, rugby and football teams from Ranje sec school took part. The probability that the rugby would win their first match was 1/8 while that the handball team could lose was 4/7. Find the probability that at least one team won the first match.
Date posted: November 11, 2019. Answers (1)
- Points A and B lie on latitude 15°N and their longitudes differ by 25°. An aircraft takes 8 hours to fly between the points. Calculate...(Solved)
Points A and B lie on latitude 15°N and their longitudes differ by 25°. An aircraft takes 8 hours to fly between the points. Calculate its speed in knots.
Date posted: November 11, 2019. Answers (1)
- Calculate the semi-interquartile range of 3,4,1,2,3,6,8,5,7,9.(Solved)
Calculate the semi-interquartile range of 3,4,1,2,3,6,8,5,7,9.
Date posted: November 11, 2019. Answers (1)
- State the amplitude and the phase angle of the curve 4y = cos(5x - 400)(Solved)
State the amplitude and the phase angle of the curve 4y = cos(5x - 400)
Date posted: November 8, 2019. Answers (1)
- In an experiment, water was heated and its temperature changes recorded at intervals of 2 minutes as shown in the table below.
a) On the grid...(Solved)
In an experiment, water was heated and its temperature changes recorded at intervals of 2 minutes as shown in the table below.
a) On the grid provided, plot the points and draw the line of best fit.
b) Use the line of best fit to estimate the time taken for the temperature of the water to be 75℃.
Date posted: November 8, 2019. Answers (1)
- Solve the quadratic equation by completing the square method. 2x2 - 5x = -3(Solved)
Solve the quadratic equation by completing the square method.
2x2 - 5x = -3
Date posted: November 8, 2019. Answers (1)
- In the figure below, AB is a diameter of the circle. Chord PQ intersects AB at N. A tangent to the
circle at B and meets...(Solved)
In the figure below, AB is a diameter of the circle. Chord PQ intersects AB at N. A tangent to the
circle at B and meets PQ produced at R.
Given that PN = 14 cm, NB = 4 cm and BR = 7.5 cm, calculate the length of;
a) NR
b) AN
Date posted: November 8, 2019. Answers (1)
- Calculate the exact value of compound interest earned on Sh. 20 000 for 1 and half years at the rate of 12% p.a, compounded half yearly.(Solved)
Calculate the exact value of compound interest earned on Sh. 20 000 for 1 and half years at the rate of 12% p.a, compounded half yearly.
Date posted: November 8, 2019. Answers (1)
- Given that z varies directly as the square of x and inversely as the square root of y.(Solved)
Given that z varies directly as the square of x and inversely as the square root of y. If x = 2, y = 9
when z = 3, find z when x = 3 and y = 4.
Date posted: November 8, 2019. Answers (1)
- Solve for x in the equation log (5x - 15) - log(2x - 3) = 1(Solved)
Solve for x in the equation
log (5x - 15) - log(2x - 3) = 1
Date posted: November 8, 2019. Answers (1)
- The equation of a curve is given by y=x3 + 4x2 - 3x.(Solved)
The equation of a curve is given by y=x3 + 4x2 - 3x.
a) Find the value of y when x=1
b) Determine the stationary points of the curve.
c) Find the equation of the normal to the curve at =1 .
Date posted: November 8, 2019. Answers (1)
- (a) The ratio of Juma’s and Akinyi’s earnings was 5:3. Juma’s earnings rose to Ksh 8 400 after an increase of 12%. Calculate the percentage...(Solved)
(a) The ratio of Juma’s and Akinyi’s earnings was 5:3. Juma’s earnings rose to Ksh 8 400 after an increase of 12%. Calculate the percentage increase in Akinyi’s earnings given that the sum of their earnings was Ksh. 14 100.
(b) Juma and Akinyi contributed all the new earnings to buy maize at Ksh 1 175 per bag. The maize was then sold at ksh 1 762.50 per bag. The two shared all the money from the sales of the maize in the ratio of their contributions. Calculate the amount that Akinyi got.
Date posted: November 8, 2019. Answers (1)
- The figure below represent two neighboring plots with QR as their common boundary.
Find to 2 decimal places,
i. The length of boundary PQ.
ii. The length of...(Solved)
The figure below represent two neighboring plots with QR as their common boundary.
Find to 2 decimal places,
i. The length of boundary PQ.
ii. The length of boundary RS.
iii. The angle RQS.
iv. Area of triangle QRS.
Date posted: November 8, 2019. Answers (1)
- On the grid provided, draw the square whose vertices are A(6, -2), B(7, -2), C(7, -1) and D(6, -1).(Solved)
On the grid provided, draw the square whose vertices are A(6, -2), B(7, -2), C(7, -1) and D(6, -1).
On the same grid, draw:
(i) A’B’C’D’ the image of ABCD, under an enlargement scale factor 3 centre (9, -4)
(ii) A"B”C”D” the image of A’B’C’D’ under a reflection in the line x = 0
(iii) A”’B’”C’”D’” the image of A”B”C”D” under a rotation of +90° about (0,0).
Date posted: November 8, 2019. Answers (1)
- Complete the table below for the function y = 3x2 - 2x + 5(Solved)
a. Complete the table below for the function y = 3x2 - 2x + 5
b. Use the completed table and mid ordinate rule to estimate the area bounded by the curve, the x - axis
and the lines x = -3 and x = 5
c. Use calculus to calculate the actual area in part b above.
d. Calculate to 3 significant figure the percentage error when mid ordinate rule is used to estimate the
area.
Date posted: November 8, 2019. Answers (1)
- A line L1 passes through the points (-2, 3) and (-1, 6) and is perpendicular to L2 at (-1, 6).(Solved)
A line L1 passes through the points (-2, 3) and (-1, 6) and is perpendicular to L2 at (-1, 6).
a) Find the equation of L1.
b) Find the equation of L2 in the form ax + by - c = 0 where a, b and c are constants.
c) Given that another line L3 is parallel to L1 and passes through point (1,2) , find the x and y intercepts of L3 .
d) Find the point of intersection of L2 and L3.
Date posted: November 8, 2019. Answers (1)
- The diagram represents a solid frustum with base radius 21cm and top radius 14cm. The frustum is
22.5cm high and is made of a metal whose...(Solved)
The diagram represents a solid frustum with base radius 21cm and top radius 14cm. The frustum is
22.5cm high and is made of a metal whose density is 3 𝑔⁄𝑐𝑚3. (Take 𝜋 = 22/7)
a) Calculate
(i) The volume of the metal in the frustum.
(ii) The mass of the frustum in kg.
b) The frustum is melted down and recast into a solid cube. In the process 20% of the metal is lost.
Calculate to 2 decimal places the length of each side of the cube.
Date posted: November 8, 2019. Answers (1)