# Maths

Most popular questions and responses by Maths
1. ## TRIGONOMETRY

Express tan theta in terms of cosec theta

2. ## trigonometry

A tree is broken over by the wind. It forms a right angled triangle with the ground. If the broken part makes an angle of 60° with the ground and the top of the tree is now 20m from its base, how tall WAS the tree?

3. ## plz plz help me belive me have tried

cosx+cosy=a and sinx+siny=b show that sin2x+sin2y=2ab(1-(2/(a^2+b^2)) plz plz show step

4. ## MATHS

A girl start at A and walks 2km south to B. she then walks 3km west to C. find the distance and bearing of C from A

5. ## Math

Paulo and sergio buy a pizza.paulo eats 1/3 of the pizza and sergio eats two fifths.how much of the pizza is left over?

6. ## Maths

The temperature at 6pm of town was 37 degree c at mid night the temperature was 31 degree c if the rise in temperature per hour

7. ## math

prove that the value of cosx + secx can never be 3/2.

8. ## Maths

John is FIVE years older than Peter.Twice the product of their ages FIVE years ago is 100 more than product of their present ages.Find the present ages of John and Peter.

9. ## Math

1/2,3/2 and 6/2 find the value

10. ## maths

. 30 girls and boys have planned for a picnic. There is a ratio of 3 girls to 7 boys. How many boys are there?

11. ## trigonometry...........

Prove the following identity:- (i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx

12. ## TRIG..............

Q.1 Prove the following identities:- (i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx (ii) (1+cotx+tanx)(sinx-cosx)/sec^3x-cosec^3x = sin^2xcos^2x.

13. ## Venn Diagram

In a class of 40 student,the number of student who study french is 10 more than the number of student who study history.if 8 student study both french and history,how many student study (1)history (2) french

14. ## Math

Simplify:- 3√-108a^4 b^3

15. ## maths

a rectangular courtyard is 57 cm 50 cm long and 22 m . determine the least possible number of square stones of the same size required to pave it.

16. ## Maths

a tray holds 2.3 liters of water when full (2300 cm3) Calculate the height (h cm) of the tray Tray = L=15cm B=20cm H=?

17. ## math

The length of a room is double its breath. Its height is 5m the area of four walls ( including the door and windows) is 210sq m. Find its volume solve this sum

18. ## maths

i am a two digit number above 50. the sum of my digits is 12. and the difference of my digits is 4. who am i?

19. ## maths

A factory produces two products A and B using raw materials p and q. It uses 3 units of p and 1 unit of q to produce one unit of A. It uses 1 unit of p and 2 units of q to produce one unit of B. The maximum daily supplies are 330 units of p and 220 units

20. ## maths

f(x)=x ^2 +bx+c , b and c real .Find the minimum of (max|f(x)|)for x∈[−10,10]?

21. ## Maths

Please show me the way of using formula log?

22. ## question (doubt)....

solve to find x and y:- x^3+8y^3+x+2y=0

23. ## TP

What is Standard Deviation? As in what does it measure, is it a measure of spread of a graph of results?

24. ## K

(a) Find the indeﬁnite integrals of the following functions. (i) f (t) = 6 cos(3t) + 5e^−10t (ii) g(x) = 21-12x^3/ x (x > 0) (iii) h(u) = cos^2( 1/8 u) (b) Evaluate: (this big F sign at the start, 5 at the top and 1 at the bottom) 5 1/4x (7 + 6x^2) dx

25. ## Math

The sides of a rectangle are in the ratio4:5.by what fraction should the shorter side be increaaed tomake it a square

26. ## sir damon plz help me or steve

An ac source of 50v,100÷πHz is connected in series with an inductor of inductance L ad a resistor of resistance R.the current in the circuit is 2A ad p.d. across L and R are 30v ad 40v respectively 1) calculate the average power dissipated ? (2)

27. ## Maths

Solve For X And Y 2x-4y=-3

28. ## Maths

Q. a^4 - 13a^2 + 36 Factorise

29. ## math

an urn contains 2 white and 2 black balls. a ball is taken at random. if the ball is white then it is not replaced otherwise it is replaced along with another ball of the same colour. find the probability that the third ball drawn is black.

30. ## Maths

The Ratio Of The 2nd Term To The 7th Term Of An A.P Is 1:3 And Their Sum Is 20.Calculate The Sum Of The 1st Terms Of The G.P

31. ## speed time distance

a train running at the speed of 180 km hr crosses a 365 meter long platform in 21sec. what is the length of the train

32. ## Maths

Is given a function: f(x)=x2 + px + q Prove that: f(x+1) + f(x-1)= 2+2 f(x)

33. ## maths

Find the smallest n such that for any prime p, at least 20 numbers 1,2, ..., n are quadratic residues not modulo p. k is quadratic residue modulo p if there exists an integer j such that j^2 ≡ k (mod p).

34. ## maths

There are N ordered integer quadruples (a,b,c,d) subject to 0≤a,b,c,d≤99990 such that ad−bc≡1(mod99991). What are the last three digits of N?

35. ## statistics

A computer course is conducted for 24 days.Each day 48 persons attended the course.To prepare a day wise work done sheet for all 24 days,find the estimated and the actual number of persons attended the course.Is the estimated value more or less than the

36. ## general maths

A study of motor vehicle rates in the 50 states reveals that traffic death rates (deaths per 100 million motor vehicle miles driven) can be modeled by the normal curve. The data suggest that the distribution has a mean of 5.3 and a standard deviation of

37. ## math

are all regular hexagons similar? how can i explain?

38. ## Maths

SAMUEL IS 5 YEARS OLDER THAN HIS BROTHER .THE SUM OF THEIR AGES IS 33.WRITE A MATHEMATICAL EQUATION?

39. ## math

Two no which have same digit their sum is 9and difference is 27what will be the nos

40. ## MATH

HOW MANY QUATERS KG CAN BE MADE FROM 15 KG ?

41. ## Maths

1^2014 + 2^2014 + 3^2014 + 4^2014 + 5^2014 divided by 5, remains ______

42. ## physics -damon help

An ac source of 50v,100÷πHz is connected in series with an inductor of inductance L ad a resistor of resistance R.the current in the circuit is 2A ad p.d. across L and R are 30v ad 40v respectively 1) calc d average power dissipated 2) calc d power

43. ## MATHS

1) For how long must an investment be left at 5.5% p.a compounded yearly for the initial amount to double?

44. ## value

in a class 7 2 fifthy were girls ,27were boys ,how many girls were there

45. ## math

if the papers of 4 students are checked by any of the 7 teachers, then the probability that all the 4 papers are checked by exactly 2 teachers is?

46. ## maths

if A and B are in ratio 3:4 and B and C in 12:13,then A and C will be

47. ## Lara

Alice has 4 times as much money as Benny. If Benny has \$36 less than Alice, how much money do they have altogether? A \$45 B \$48 C \$60 D \$180

48. ## maths

A subset S of {1,2,…,n} is said to be packed if whenever i,j∈S the number ⌊(i+j)/2⌋ is also in S. Determine how many subsets of {1,2,…,25} are packed. Details and assumptions i and j need not be distinct. If i=j is in the set, then clearly so is

49. ## physics

The efficiency of a machine is in general defined as the ratio between useful (released) energy and the input energy. Therefore, the exact formulas for efficiency depend on the purpose of the machine. What's the difference in the maximal efficiency of a

50. ## maths

Suppose p(x)=ax^2+bx+c is a quadratic polynomial with real coefficients and |p(x)|≤1 for 0≤x≤1. Find the largest possible value of |a|+|b|+|c|.

51. ## MATHS......

solve the following. 1) x^3+3y^3+x+2y

52. ## MA

a) find the equation of AB, the perpindicular bisector of the line joining the points P(-3,1) and Q(1,9) (line AB intersects the point at midway of PQ) b) C is the centre of a circle passing through P and Q. given that QC is parralel to the yaxis,

53. ## maths

a) find the equation of AB, the perpindicular bisector of the line joining the points P(-3,1) and Q(1,9) (line AB intersects the point at midway of PQ) b) C is the centre of a circle passing through P and Q. given that QC is parralel to the yaxis,

54. ## math

given that a/b=c/d, decide whether it is true or not that a/c=b/d. and how can i explain my reasoning?

1. ## French

is musculine or feminine

posted on August 4, 2017
2. ## math

The product of two numbers is 504347 .If one of the number is 317.Find hte other number

posted on June 27, 2017
3. ## plz plz help me belive me have tried

how did sin(x+y)=2sinxsiny is it not suppose to be sin(2x)

posted on November 2, 2016
4. ## math

maths

posted on May 16, 2016
5. ## math

16x+8x+4x^2-16x+20+10+5x-20therefore 4x^2+8x+5x+10 4x^2+13x+10

posted on August 24, 2014
6. ## math

a sack contain 10 blue and 6 red crayons another sack contains 9 blue and 12 red crayons two crayons are drown at random without replacement from each sack. what is the probability that all the four crayons are blue? exactly one of the four crayons is red

posted on July 7, 2014
7. ## Maths

You shouldn't be asking for help in the maths challenge. It is against the rules.

posted on June 15, 2014
8. ## unscrambling word

mbicned

posted on September 6, 2011
9. ## math

thank you

posted on May 26, 2009
10. ## math

thank you

posted on May 26, 2009
11. ## goemetry

thnx

posted on May 26, 2009