Study resources on Kenyaplex

Get ready-made curriculum aligned revision materials

Exam papers, notes, holiday assignments and topical questions – all aligned to the Kenyan curriculum.

Browse exam papers

Or go directly to:

Class notes Holiday assignments Topical questions Other resources

Calculate all the values of x between -180° and +180° which satisfy the equation 6 cos (x - 30)° = -3.

Calculate all the values of x between -180° and +180° which satisfy the equation 6 cos (x − 30)° = −3.

Answers

Cos (x – 30)⁰ = -0.5 ?Cos (x -30) = Cos 120
x -30 = 120
x = 150⁰

Kavungya answered the question on November 12, 2019 at 12:19

Answer Attachments

Next: State two precautionary measures which should be taken in preventing the spread of HIV.

Previous: Explain why movement of air molecules is not energy driven process.

View more Mathematics Questions and Answers | Return to Questions Index

Exams With Marking Schemes

Related Questions

The cost of a matatu was sh. 950 000.It depreciated in value by 5% per year for the first 2 years and 15% per for... (Solved)

The cost of a matatu was sh. 950 000.It depreciated in value by 5% per year for the first 2 years and 15% per for the subsequent years. Calculate the value of the matatu after 5 years.

Date posted: November 12, 2019 . Answers (1)
Given that P varies directly as V and inversely as the cube root of R and that P = 12 when V = 3 and... (Solved)

Given that P varies directly as V and inversely as the cube root of R and that P = 12 when V = 3 and R = 2,
(i) Find an equation connecting P, V and R.
(ii) Find the percentage change in P if V is increased by 12% and R decreased by 36%

Date posted: November 12, 2019 . Answers (1)
The radius and height of a cylindrical Kentank rounded to 1 cm are 105 cm and 300 cm respectively. Calculate the percentage error in its volume. (Solved)

The radius and height of a cylindrical Kentank rounded to 1 cm are 105 cm and 300 cm respectively.
Calculate the percentage error in its volume.

Date posted: November 12, 2019 . Answers (1)
Given that and that a and b are rational numbers, find the values of a and b. (Solved)

Given that and that a and b are rational numbers, find the values of a and b.

Date posted: November 12, 2019 . Answers (1)
Use the method of completing the square to solve 4 - 9x - 3x² = 0 (Solved)

Use the method of completing the square to solve
4 − 9x − 3x² = 0

Date posted: November 12, 2019 . Answers (1)
Solve for x in log³ = log⁵ 0.5. (Solved)

Solve for x in log³ = log⁵ 0.5.

Date posted: November 12, 2019 . Answers (1)
(a) Expand and simplify (x - 1/2x)⁶ up to the term in x³ and state the constant term. (b) Use this expansion to calculate to... (Solved)

(a) Expand and simplify (x − 1/2x)⁶ up to the term in x³ and state the constant term.
(b) Use this expansion to calculate to 4 d.p the value of (0.96)⁶.

Date posted: November 12, 2019 . Answers (1)
Make h the subject of the formula. (Solved)

Make h the subject of the formula.

Date posted: November 12, 2019 . Answers (1)
In this question, show all the steps in your calculations, giving the answer at each stage. Use logarithms correct to decimal places, to evaluate. (Solved)

In this question, show all the steps in your calculations, giving the answer at each stage. Use logarithms correct to decimal places, to evaluate.

Date posted: November 12, 2019 . Answers (1)
The speed of projectile v m/s at a given time t is given by v=10(10t-t²) (Solved)

The speed of projectile v m/s at a given time t is given by v=10(10t-t²) calculate
a. The time when the velocity is maximum
b. The maximum velocity attained
c. The distance traveled by the body in the first 6 seconds
d. The acceleration of the projectile at t=6.5sec

Date posted: November 12, 2019 . Answers (1)
(a) Complete the table below for the function y = 2x² + 3x – 5.(b) On the grid provided draw the graph of y =... (Solved)

(a) Complete the table below for the function y = 2x² + 3x – 5.

(b) On the grid provided draw the graph of y = 2x² + 3x – 5 for -4 = x = 2
(c) Use your graph to state the roots of
(i) 2x² + 3x – 5 = 0
(ii) 2x² + 6x – 2 = 0

Date posted: November 12, 2019 . Answers (1)
Four towns A, B, C and D are such that B is 84km direct to the north of A and C is on a bearing... (Solved)

Four towns A, B, C and D are such that B is 84km direct to the north of A and C is on a bearing of N 65^oW from A at a distance of 60km. D is on a bearing of 340^o from C at a distance of 30km. Using a scale of 1 cm rep 10km
a) Make an accurate scale drawing showing the relative positions of the towns
b) Find the distance and bearing of B from C
c) Find the distance and bearing of D from B
d) Find the bearing of A from D

Date posted: November 12, 2019 . Answers (1)
The figure above shows two circles ABPQ and ABSR intersecting at A and B. QART, PBS and ABU are straight lines. The line TSU is... (Solved)

The figure above shows two circles ABPQ and ABSR intersecting at A and B. QART, PBS and ABU are straight lines. The line TSU is a tangent to the circle ABSR at S. Given that ˂BPQ = 80^o, ˂PBU = 115^o and ˂BUS = 70^o.

Find & state reasons for the following angles
a) ˂BRS
b) ˂BSU
c) ˂STR
d) ˂BAR
e) ˂ARB

Date posted: November 12, 2019 . Answers (1)
(a). The price of an article is marked as sh.12,000. Mr. Mulmulwas sold the article at a discount of 10% and still made a profit... (Solved)

(a). The price of an article is marked as sh.12,000. Mr. Mulmulwas sold the article at a discount of 10% and still made a profit of 5%. Calculate the cost of the article.
(b). Mr. Mulmulwas made a loss of 30% by selling an electric kettle at sh.700. What profit would he have made if she had sold it at sh.1150?
(c). Mr. Mulmulwas is a real estate agent who is entitled to a commission on all properties bought through him. During a certain month he sold 2 mansions at sh. 2.54 million each, 4 flats at sh. 582,000 each and 5 bungalows at sh.354,000 each and he was paid a total commission of sh.458,900. Calculate the percentage rate of commission he was paid.

Date posted: November 12, 2019 . Answers (1)
Given A find AB. (Solved)

Given A find AB.

Date posted: November 12, 2019 . Answers (1)
Matrices P and Q are given by P = (3 1 2)and Q = (1 2 -1) Find the product PQ. (Solved)

Matrices P and Q are given by P = (3 1 2)and Q = (1 2 -1) Find the product PQ.

Date posted: November 12, 2019 . Answers (1)
Find all the integral values of ?? which satisfy the inequalities 20 - x > 5 + 2 x = x + 5 (Solved)

Find all the integral values of x which satisfy the inequalities
20 − x > 5 + 2 x ≥ x + 5

Date posted: November 12, 2019 . Answers (1)
The angle of elevation of the top of a building from a point P is 45^o. From another point T, 15 meters nearer the foot... (Solved)

The angle of elevation of the top of a building from a point P is 45^o. From another point T, 15 meters nearer the foot of the building, the angle of elevation of the top of the building is 52^o. Calculate the height of the building.

Date posted: November 12, 2019 . Answers (1)
Using tables, find the reciprocal of 0.432 and hence evaluate (Solved)

Using tables, find the reciprocal of 0.432 and hence evaluate

Date posted: November 12, 2019 . Answers (1)
The figure below shows a solid wedge PQRSTU. Complete the solid showing all the hidden edges with dotted lines. (Solved)

The figure below shows a solid wedge PQRSTU. Complete the solid showing all the hidden edges with dotted lines.

Date posted: November 12, 2019 . Answers (1)