# A GOODSTUDENT

Most popular questions and responses by A GOODSTUDENT
1. ## MATHS 2

If x+y=45°, prove that {(cotx+1)(coty+1)}/{cotx×coty}=2 Please help me in this TRIGONOMETRY problem. From the topic - TRIGONOMETRY Ratios of compound angles

2. ## Physics

One ship, sailing east with a speed of 7.5 m/s, passes a certain point at 8A.Mand a second ship sailing north at the same speed, passed the same point at 9:30 A.M. At What time are they closest together and what is the distance between them then?

3. ## math (opt) math 2

A flagstaff of placed at one corner of a rectangular playground 40m long and 30m wide. If the angle of elevation of the top of flag staff from the opposite corner of 30°, find height of the flagstaff. (The question is complete and I have cross checked the

4. ## Mathematics

A dealer gains a selling price of 4 watches by selling 20 watches. What is the percentage of profit?

5. ## MATHS

A dishonest shopkeeper has 2 false balances. One balance weighs 10 %more while buying goods and other weighs 10% less while selling the goods. Find his gain percent just by weighing. Plzz help How do I start and how to solve it

6. ## Physics

In a Young's Double Slit experiment, the separation of four bright fringes is 2.5mm, the wavelength of light used is 6.2*10^-7m. If the distance from the slits to the screen is 80cm, calculate the separation of two slits. I tried applying

7. ## Physics

In a Young's Double Slit experiment, the separation of four bright fringes is 2.5mm, the wavelength of light used is 6.2*10^-7m. If the distance from the slits to the screen is 80cm, calculate the separation of two slits. I applied 4*¥D/d=1.5*10^-3m but

8. ## SCIENCE

When a student added Zinc granules to dilute HCI, a colorless and odorless gas was evolved, which was tested with a burning match stick, it was observed that: (a) The match stick continued to burn brilliantly. (b) The match stick burnt slowly with a blue

9. ## math2

Find the equation of the straight line passing through the point(3,-2) and making an angle of 60° with the line√3x+y-1=0 Plzz help someone

11. ## Science - heat

1-By opening the door of a refrigerator ehich is inside a room, the temperature of the room : A) decreases B) increases C) remains unchanged D) first decreases and then increases******(my ans) 2- The thermometer used to measure very low temperature is -

12. ## MATHS

A manufacturer offers a20% rebate on the marked price of a product. The retailer offers another 30%rebate on the reduced price. Find the single equivalent reduction of the two reductions. Please help!

What is the difference between a hydrogen filled balloon and an air filled balloon moving in air? please answer. THe question is from the chapter PRESSURE.

14. ## math2

I was solving a problem. In It r have been given that two lines are perpendicular to each other The equation of one line 2x-3y+4=0 Now i have to find the equation of another line We can find it by finding the slope of the abovementioned line( the other

15. ## PHYSICS pressure

What is the difference between a hydrogen filled balloon and an air filled balloon moving in air?

16. ## Physics

If a stone is thrown with velocity 10 m/s. How high will it reach after 10 s. Take g = 10 m/s^2 I want to know if this question is practically possible. I tried to solve this problem and ended up getting the answer in negative. Please help me!!! Afterall

17. ## math

please help me with this question. I just can't figure it out. A cylindrical jar of radius 6cm contains water. How many iron solid spheres each of radius 1.5cm are required to immerse into the jar to raise the level of water by 2cm?

18. ## Math or Maths???

Which word is correct to use? Math or Maths?

19. ## MATHS plzz help ASAP

while paying a bill a man paid \$189.80 as the amount of VAT at 13%. how much was the actual bill amount? Plzz help Should i calculate SP+VAT OR ONLY SP

20. ## Math

Ben buys some oranges at the rate of 10 per \$. He also buys equal number of oranges at the rate of 12 per \$. He mixes them together and sells them at 15 per \$. Find his loss or profit percent.

Solve (0

22. ## social exam tomorrow

Who are gaochos?

23. ## math

2 boys and 5 girls can finish a piece of work in 4 days. 4 boys and 4 girls can finish the same work in 3 days. If a girl is paid rs 750 each day, what may be the expenditure to complete the work? Tomorrow is my test and I don't know how to solve this

24. ## Math HELP

2 boys and 5 girls can finish a piece of work in 4 days. 4 boys and 4 girls can finish the same work in 3 days. If a girl paid rs 750 each day, what may be the expenditure to complete the work? Tomorrow is my test and I don't know how to solve this

25. ## math

The total price of a mobile and a watch is rs8000. If 10% discount and 10% VAT IS imposed on both, their selling price becomes rs7920, find the marked price of mobile and watch separately. Well I did this question and every time I get to a point where the

26. ## MATH

The tip of a plant was 6cm above a lake but a sudden wind forced the plant to move 10 cm fat from its original position and then it submerged into the lake. Find the depth of the lake upto which it was sinking. Please help!!!!!!!!!!

27. ## maths reiny help!!

You had helped me with a similar question. This one says : A whole seller supplies 90 books while he was ordered to send 80 books by a retailer. If 15%trade discount was given, what was the net discount to the retailer? I solved this one in the similar way

28. ## MATHS REINY

You had helped me with a similar question. This one says : A whole seller supplies 90 books while he was ordered to send 80 books by a retailer. If 15%trade discount was given, what was the net discount to the retailer? I solved this one in the similar way

29. ## maths

A shopkeeper mixes two types of milk costing rs 25per litre and rs 30per litre. if he sells 60litres of mixture for rs 1600, find the quantity of each type of milk.

31. ## Math

The product of numbers 3^(1/3).3^(1/9).3^(1/27)...... To infinity is A.3 B.3^(1/3) C.3^(1/2) D.3√3

32. ## Science

A ball is dropped from a height of 20 meter and rebounded with a velocity which is 3/4 of the velocity with which it hits the ground. What is time interval between the first and second bounces?

33. ## Physics

Two trains are running on parallel tracks., train A is faster than B.There is a box on each train of identical nature. But mass of box in train A is more than that of train B. If box is changed between the trains, what happens to speed of trains? A.Same B.

34. ## English

This was a question asked in our last test Either of her eyes --------- not work well. (Do, does, is) I answered 'do' but some of my friends say 'does' is the correct answer. Now I am really confused. Please someone help. What's the correct answer???

35. ## math

A and B play card on stake. A gains from B 1/4 of the latter's money. B gains from A 1/3 of A's original money. Each has now rs 400. How much money did each have before playing the game? Well I tried this question a lot and have no clue how to do it I made

37. ## MATHS

Rama and Radha each had a set of marbles . rama said to radha 'if you give me 10 of your marbles then i shall have twice as many as you have' . radha said to rama ' if you give me 10 of your, i shall have thrice as many as you have' found the marbles that

38. ## Maths

Out of group of goats,Two times the square root of the number of goats were kept in shade, 1/4 of the number were taken for grazing and 15 were sold, find the initial no. Of goats?

39. ## MATHS (EQUATIONS)

A piece of stone loses its 1/5 th of weight when it is weighted in water and a piece of iron loses 1/10th of its weight under the same condition. The total weight of the both materials in air is 280grams and in water is 240 grams. Find the weight of both

1. ## Math

I am titally lost in this question and have absolutely no idea. Is there some rule or particular formula of solving such questions?

posted on May 21, 2017
2. ## algebra

l=2w-----1 2{(l+4)+(w-1)}=198-----2

posted on April 23, 2017
3. ## Science - heat

Thank you very much DrBob222

posted on April 21, 2017

-5(2a+5) is the one for 3

posted on October 31, 2016
5. ## chemistry

True solution 1. Sucrose dissolved in water 2. Salt solution 3. Lemon juice 4. Urea in water 5. Acetic acid in water 6. Copper sulphate in water 7. All ionic compounds in water 8. Ethanol in water 9. Glucose dissolved in water 10. Air Could've googled

posted on October 8, 2016
6. ## Math

Am pretty sure that his auto correct is to blame for this.😞😃😞

posted on October 1, 2016
7. ## algebra

While checking it should've been 0.75(-800-24)+400=-182

posted on October 1, 2016
8. ## Grammar

Is it paining? And ur choice is...? How about using brackets and commas for the options?????

posted on September 30, 2016
9. ## math

19 Hmmmmm very similar to what I did when I was here first time

posted on September 29, 2016
10. ## computer science

I will write a simple qbasic program (u make algorithm yourself) CLS for I =2to 20 step 2 Print I Next I End

posted on September 22, 2016
11. ## algebra

'the' not 'he'

posted on September 22, 2016
12. ## Algebra 1

'Rather strange people' lol

posted on September 21, 2016
13. ## Math

Ahh !😊 Now I get it. Thanks

posted on September 16, 2016

How about using some parentheses in posting questions

posted on September 14, 2016
15. ## math2

Ahh interchange of coefficients of x and y and sign change of y Now I get it

posted on September 14, 2016
16. ## Maths

Exterior angle of a triangle of the sum of two opposite interior angles. So I see a typo in your question The way to do this is Exterior angle= two opposite interior angle s Or exterior = x+ another interior Find x And then X+ another interior+ y= 180

posted on September 13, 2016
17. ## MATHS2

Thanks

posted on September 13, 2016
18. ## Math

You took 10 as LCM for the first two terms but the second term is negative In your second step you have taken a positive sign Second step must be (3-1)/10

posted on September 12, 2016
19. ## algebra

Assuming that you meant z=x+(y/2) Or z-x =y/2 Or 2(z-x)=y Otherwise it you meant z=(x+y)/2 Or x+y= 2z Or y= 2z-x

posted on September 12, 2016
20. ## Math

I don't see any way to solve this one. And you have 3 boxes and all options are odd numbers and you have an even number on the RHS PROBABLY THERE IS SOME TECHNIQUE Or you need to some smartness here 3 factorial gives 6 so 1 solution that I see here is

posted on September 11, 2016
21. ## Math

3 - wrong 4-wrong again You need some practice with this -20/-10 For your ease Eliminate the negative signs coz - divided by- is plus Now cut the two zeros The you have 2/1 And answer is 2 Try 4 yourself

posted on September 11, 2016
22. ## Math

1-. 87-396 gives a negative value. 2-. Yes 3-. No negative value divided by another negative value gives a positive value 4-. Both your selections are wrong You can type the problems on Google or on a calculator to check them.

posted on September 10, 2016
23. ## English

Oh did I type I answered do? I am sure I answered does and my friend s said do That was a brain fade. Typo

posted on September 10, 2016
24. ## English

Thank you so much. Now I got some relief.

posted on September 10, 2016
25. ## math (opt) math 2

Oh so u used Pythagoras theorem for the diagonal. Thank you

posted on September 10, 2016
26. ## Math

From 1 X-y=5 Or x= 5+y Putting value of x(ie - 5+ y) in eqn. 2 5+2y =7 Or y=(7-5)/2 Solve for y and put the value of y in equation 1

posted on September 9, 2016
27. ## maths

I know I can't help you but Is this the nikhil-jain riddle ( like the 'Einstein's riddle') And who gives such large questions. And what about grammar and punctuation. And I don't see a question there. It seems as if it's a paragraph and there is no

posted on September 9, 2016
28. ## social exam tomorrow

According to my text - gaucho's are the cowboys of Argentina who look after the cattle in the pampas AM I RIGHT???

posted on September 8, 2016
29. ## maths

posted on September 8, 2016
30. ## math age problem

Let your age(not mine) be x 4(x-6)-x=10

posted on September 5, 2016
31. ## math

Suppose I am 20 yrs old Then 25*2=50-10=40/2=20 My age again. Don't look the solution I have broken maths there with those equal to signs

posted on September 5, 2016
32. ## Physics

Look subject

posted on September 4, 2016
33. ## math

Well I have no idea how I got 4 there. I meant 3

posted on September 3, 2016
34. ## math

Let numerator be x and denominator be y Fraction is x/y 1st case x+1/y+1 = 3/4 2nd case. X-3/y-4= 1/2 Solve for x and y

posted on September 3, 2016
35. ## Algebra

I think reiny already answered the same question. Look at related questions below

posted on September 2, 2016
36. ## math

Thanks allot. that helped a lot . I hadn't even understood latter half of the question so this helped a lot

posted on September 1, 2016
37. ## Math

Correct

posted on September 1, 2016
38. ## Math HELP

I meant 'if a girl is paid rs 750......'

posted on September 1, 2016
39. ## math

Thanks a lot

posted on August 31, 2016
40. ## math

Na! I checked out twice. Nothing extra is given. So it is perhaps one of those types!

posted on August 31, 2016
41. ## maths need helper

How about cos inverse(200) Is this correct

posted on August 30, 2016

But how did you get +√1.5 it's-√1.5 But still according to you the question is incomplete. However if x=0 then you would get a true equation. But how do I solve it to get even at least 0

posted on August 29, 2016
43. ## algebra

Length = 2* width Let length be l and w be the width Then 2(l+w)=126 2(3w)=126 W=126/6 Find out what you want to find. And please type the full question. That one seems to be just a statement.

posted on August 28, 2016
44. ## math

Digits be x and y and number is 10x+y xy=24 (assuming you meant the product of the digits) And second equation is 10y+x-(10x+y) = 27 Take over

posted on August 28, 2016
45. ## science

Look related questions below and it is better that you Google such questions

posted on August 26, 2016
46. ## Statistics

I am a part of history

posted on August 26, 2016
47. ## maths reiny help!!

I reckon the book has a misprint answer because, my friends said that they had the same concept and had done the solution the same way. Thanks for the help any way reiny. And anyway I am from Nepal not USA.

posted on August 26, 2016
48. ## math

3cos@=1 Cos@ = 1/3 Sec@ = 1/(1/3) Sec@ = 3

posted on August 26, 2016
49. ## Science

Collect more sunlight

posted on August 26, 2016
50. ## MATHS REINY

?????

posted on August 26, 2016
51. ## algebra

Area = l*w So let width be w and length be w+6 Noe equation is B(B+6) = 72 Solve for B and find the answer

posted on August 26, 2016
52. ## science

SiO2 But better put such types of questions in Google than waiting around here.

posted on August 26, 2016
53. ## Math

Do you mean ------ (Y^12)/(Y^12)

posted on August 26, 2016

Put that in calculator -2.6-5.4

posted on August 26, 2016
55. ## algebra

m=d*v. Lol

posted on August 26, 2016
56. ## MATHS

Thanks reiny. I got it. and I also got how u got it

posted on August 25, 2016
57. ## SCIENCE

Thanks

posted on August 24, 2016
58. ## Math

Ooopsie made a little typo. It's y+y+ 28= 50 But if the question demanded an equation as I mistakenly posted then you may have to convert the value into years and months

posted on August 24, 2016
59. ## Math

Let gir's age be y and father's be y+28 Now equation is y+y+5=50 And solve

posted on August 24, 2016
60. ## Maths

Thanks

posted on August 22, 2016
61. ## Maths Algebra

let mona's curent age be y and father's be x 1st case- 3y=x 2nd case-x+12=2(y+12) or x+12=2y+24 since x = 3y 3y+12=2y+24 and y = 12 x = 3*12 x = 36

posted on August 20, 2016