Sin 120° = sin( 180°-120°)
=sin 60°
=0.866
Cos 120° = -cos(180°-120°)
= -cos 60°
= -0.5
Tan 120° = - tan(180°-120°)
= - tan 60°
= -1.73
jeffzod answered the question on December 20, 2017 at 13:01
-
The weight of a piece of meat is given as 15 kg, to the nearest 10 g. Find the relative error and the percentage error.
(Solved)
The weight of a piece of meat is given as 15 kg, to the nearest 10 g. Find the relative error and the percentage error.
Date posted:
December 20, 2017
.
Answers (1)
-
Truncate 44.78
(Solved)
Truncate 44.78
Date posted:
December 18, 2017
.
Answers (1)
-
A solution whose volume is 80litres is made up of 40% of water and 60% of alcohol. When x litres of water are added, the...
(Solved)
A solution whose volume is 80litres is made up of 40% of water and 60% of alcohol. When x litres of water are added, the percentage of alcohol drops to 40%.
a)find the value of x
b)30litres of water is added to the new solution. Calculate the percentage of alcohol in the new solution
c)If 5litres of solution in (b) above is added to 2litres of the original solution ,calculate, in the simplest form, the ratio of water to that of alcohol in the resulting solution
Date posted:
December 13, 2017
.
Answers (1)
-
Three grades A,B and C of rice were mixed in the ratio 3:4:5.The cost per kg of each of the grades A,B and C were...
(Solved)
Three grades A,B and C of rice were mixed in the ratio 3:4:5.The cost per kg of each of the grades A,B and C were ksh.120,ksh.90 and ksh.60 respectively. calculate
a.the cost of 1kg of the mixture
b.the selling price of 5kg of the mixture given that the mixture was sold at 8% profit.
Date posted:
December 13, 2017
.
Answers (1)
-
Water and milk are mixed such that the ratio of the volume of water to that of milk is 4:1. Taking the density of water...
(Solved)
water and milk are mixed such that the ratio of the volume of water to that of milk is 4:1. Taking the density of water as 1g/cm^3 and that of milk as 1.2g/cm^3, find the mass in grammes of 2.5 litres of the mixture.
Date posted:
December 13, 2017
.
Answers (1)
-
What is a random experiment as used in statistics?
(Solved)
What is a random experiment as used in statistics?
Date posted:
December 11, 2017
.
Answers (1)
-
The probability that the school team wins a match is 0.6. The probability that the team loses is 0.3 and the probability that the team...
(Solved)
The probability that the school team wins a match is 0.6. The probability that the team loses is 0.3 and the probability that the team has is 0.1. The team plays 3 games. What is the probability that the team;(a)wins two matches
(b)either wins all the matches or loses all the matches
(c)wins one match,loses one and ties in one
Date posted:
December 9, 2017
.
Answers (1)
-
Find the equation of a circle whose diameter has the end points (-2,5) and (4,1)
(Solved)
Find the equation of a circle whose diameter has the end points (-2,5) and (4,1)
Date posted:
December 9, 2017
.
Answers (1)
-
In a factory, machines A, B and C produce identical balls. The probability that a ball was produced by machine A or B is...
(Solved)
In a factory, machines A, B and C produce identical balls. The probability that a ball was produced by machine A or B is 11/15. The probability that a ball was produced by a machine B or C is 2/3. lf the probability that a ball was produced by machine A is 1/3, what is the probability that a ball was produced by machine C?
Date posted:
December 9, 2017
.
Answers (1)
-
A bus takes 195 minutes to travel a distance of (2 x +30) km at an average speed of ( x-20) km/hr. calculate the actual...
(Solved)
A bus takes 195 minutes to travel a distance of (2 x +30) km at an average speed of ( x-20) km/hr. calculate the actual distance travelled. Give your answer in kilometers.
Date posted:
December 8, 2017
.
Answers (1)
-
State three disadvantages of secondary data in statistics
(Solved)
State three disadvantages of secondary data in statistics
Date posted:
December 4, 2017
.
Answers (1)
-
State three types of correlation in statistics.
(Solved)
State three types of correlation in statistics.
Date posted:
December 3, 2017
.
Answers (1)
-
State two major methods of measuring correlation
(Solved)
State two major methods of measuring correlation.
Date posted:
December 3, 2017
.
Answers (1)
-
Define correlation in mathematics.
(Solved)
Define correlation in mathematics.
Date posted:
December 3, 2017
.
Answers (1)
-
State three properties of standard deviation.
(Solved)
State three properties of standard deviation.
Date posted:
December 2, 2017
.
Answers (1)
-
Solve for x: cos 3x = sin 6x
(Solved)
This is under trigonometry
Date posted:
November 21, 2017
.
Answers (1)
-
Nafula broke three beakers and 4 test tubes and Munyao broke two beakers and 5 test tubes during practicals in the laboratory. If Nafula was...
(Solved)
Nafula broke three beakers and 4 test tubes and Munyao broke two beakers and 5 test tubes during practicals in the laboratory. If Nafula was charged Sh 560 and Munyao Sh 490 for the breakages, find the cost of one beaker and one test tube.
Date posted:
November 20, 2017
.
Answers (1)
-
Use tables of logarithms to evaluate.
(Solved)
Use tables of logarithms to evaluate.
$\frac{4.28 \times 0.01677}{tan 20^o}$
Date posted:
November 20, 2017
.
Answers (1)
-
Find dy/dx,let y=x^2+3. ...
(Solved)
Find dy/dx,let y=x^2+3.
Date posted:
November 18, 2017
.
Answers (1)
-
Define the following terms as used in real analysis..1.a set,2.cardinality ,3.null sets, 4.equal sets
(Solved)
Define the following terms as used in real analysis..1.a set,2.cardinality ,3.null sets, 4.equal sets
Date posted:
November 18, 2017
.
Answers (1)