# Questions Asked onJune 3, 2007

1. ## Maths

Hi, can someone give me the answer to this question: secA-tanA=1/4. Find cosA I got: CosA=4(1-sinA) Is my answer good? Now multply each side by (1+sinA) CosA(1+sinA)=4 cos^2 A CosA=1/4 (1+sinA) 16(1-sinA)=1+sinA 15=17SinA So you have sinA, now find Cos A

2. ## algebra

3ax^2 - 27a You can factor that into 3a (x^2 - 9), which also equals 3a(x-3)(x+3). It is not clear from your question what you are supposed to do with that algebraic expression. If it were equal to zero, x would be +3 or -3. If you are expected to factor,

3. ## Algebra

Solve the following linear inequality graphically. x+2y

4. ## Math

The greater of two consecutive even integers is six less than twice the smaller. Find the integers. The greater of two consecutive even integers is six less than twice the smaller. Find the integers How about x + 2 = 2x - 6 almost .. it's x + (x+2)=2x-2

5. ## physics

A 12 kg mass on a horizontal friction-free air track is accelerated by a string attached to a 100 kg mass hanging vertically from a pulley as shown. Compare the accelerations when the masses are interchanged, that is, for the case where the 100 kg mass

6. ## Economics

21st Century Electronics has discovered a theft problem at its warehouse and has decided to hire security guards. The firm wants to hire the optimal number of guards. The follwoign table shows how the number of security guards affects the number of radios

7. ## Algebra

Evaluate the expression x to the 4th power-2x to the 3rd power+5x squared+10x+12 for value of x=2 52

8. ## physics

how can i use a compass to determine whether a needle is magnetized? put the needle in a cup of water very carefully. It will float. Now if the needle is magnetized it will point north/south no matter how you carefully rotate the cup. You can check the

9. ## math

4. Compare the population per square mile in Asia to the population per square mile in North America for the year 2000. Asia Land Area (1,000 mi2) -17,400 Percent of Earth 30.1% Population in 1900 - 932,000,000 Population in 1950 - 1,591,000,000 Population

10. ## MATHS-geometry

how do you draw an obtuse angle triangle, construct the perpendicular bisector of each side Draw a triangle with one angle greater then 90 degrees. Find the midpoint of each side. Then draw a perpendicular to each side at each midpoint. The three lines may

11. ## Math

A concrete border is to be built around a triangular flower garden that has sides of 10 m, 7 m, and 8 m. The border is to be a straight walking path 1 m wide on all sides of the garden. Before the concrete can be poured, wooden formes need to be placed on

12. ## Algebra

Solve the system.4x+3y=11 and3x -2y=4 x= -2 and y = -1 678/987

13. ## physiology

Why do the control mechanisms have several intergation centers? Julia, did you mean integration or interrogation? The control systems are not simple, they are multilayered, multistepped, and operate by releasing hormones, enzymes, and bioactive substances

14. ## Chemistry

In an experiment 2.750 g of magnesium is reacted with 2.571 g of oxygen gas according to the equation: Mg + O2 ==> MgO. What mass of the other reactant is in exess? see other post.

15. ## Math

y = -6 when x = -2 y varie directly with x. what equation relates x and y? x/y = -2/-6

16. ## social studies

when did the civil war start? i think the answer would be 1861 but im not positive Yes. The American Civil War began on April 12, 1861. http://en.wikipedia.org/wiki/American_Civil_War thanx ms.sue your a big help! :)

Plz!!! HELP MEE!!! Are there any similarities between elements and compunds? Are there any similarities between elements and mixtures? Yes they are both made of matter and hence occupy space. They occur in 3 states Solid, liquid, Gas. please read:

18. ## math

a baseball team a series of five games to play, with one game each day from monday through friday. If it rains on the day of a scheduled game, the game is cancelled. There is a 20 percent probability of rain each day. how likely is it that the team will

19. ## math

I am looking for the median, I believe it is 39 am I correct? 26, 30, 38, 67, 59, 21, 17, 85, 22, 22 First line up all the numbers in order from smallest to biggest. 17 21 22 22 26 30 38 59 67 85 Next cross off one number from the left and then one from

20. ## Chemistry

In an experiment 2.750 g of magnesium is reacted with 2.571 g of oxygen gas according to the equation: Mg + O2 ==> MgO. What mass of the other reactant is in exess? You need equal number of moles of each. Which has the excess? moles Mg=2.750/molmassMg

21. ## health

i am doing a health project on contraceptives. where can i find the history of Lea's shield and Essure. They are both fairly new products and I could find nothing on wikipedia or anything. Also, where could I find stats on the use or non-use of

22. ## science

Are there similarities between mixtures, elements and compunds? Please help!! Thanks!! all are matter, in one form or another. Are there anymore similarities?

23. ## Algebra

Multiply(x-2)(x+2) X^2 - 4

24. ## Calculus

can sumeone plz help me find the derivative of (2x^2 - 12x -2) / ((x^2 + x - 2) ^ 2) thx a lot Use the following rule: derivative of u(x)/v(x) = [v du/dx - u dv/dx]/ v^2 In your case, du/dx = 4x - 12; dv/dx = 2 (x^2 + x -2)*(2x +1) v^2 = (x^2 + x - 2)^4

25. ## Algebra

Solve the following system of linear inequalities by graphing. 3x+4y=0 Try this site: http://www.purplemath.com/modules/ineqgrph.htm

26. ## math

I do not understand how to Give the five-number summary of each set of numbers. Can someone please help me? 7, 7, 5, 4, 1, 9, 8, 8, 8, 5, 2 http://en.wikipedia.org/wiki/Five-number_summary start by putting the numbers in order. 1,2,4,5,5,7,7,8,8,8,9 The

27. ## history 1

How were the children and their education during 1619-1900? http://en.wikipedia.org/wiki/History_of_education

28. ## History

I'm writing a paper on the ties between the education system and the US government. My question is, what are some major things that the government has done for the school system in the last 25 years? Title I, Title II, Title VII, Title IX, etc.

29. ## French

Please check this over. Thank you. Dans les histoires, la poignÃ©e de main et Nathalie et le Bonheur, les caractÃ¨res principaux se battent rendre leurs parents satisfaits en essayant d'accomplir des buts de les rendre heureux. Sans tenir compte de toutes

30. ## algerbra

An employee wh produces x units per hour earns a hourly wage of y=0.75x11 ( in dollars) find the hourly wage for a employee who produces 18 units per hour. would i start by mutlipying 0.75x x18? Yes, muliply .75 times 18, Yes, muliply .75 times 18, so i

31. ## math

can someone write out the equations so i can solve this please. Midtown delivery service delievers packages which cost \$ 2.10 per package to deliver. The fixed cost to run the delivery truck is \$ 78 per day. If the company charges \$4.10 per package, how

32. ## math

can somone help me with this one , what equations do i have to use or what do i have to to inorder to see if this is possible Lori Morgan has \$16,000 invested in Disney and Intel Stock. The Disney stock currently sells for \$30 a share and Intel stock for

33. ## english

i need a very simple definition of superstrate language...i have found few definitions which are all complicated...so if anyone can help Thank you for using the Jiskha Homework Help Forum. Since it appears you are studying language, here are some sites to

34. ## Math

how do you reduce a fraction Dividde both the numerator and denominator by the largest common integer possible. Then cancel them out. For example, in the fraction 15/25, the largest integer that is divisible evenly into both numerator and denominator is 5.

35. ## Science

If the 2nd ice age happened, would dolphins be able to survive? I am doing research at the same time as asking this question so I'm not just depending on the site, but I do need an answer before tomorrow. Thanks so much, London Sure. They could just

36. ## Math

The greater of two consecutive even integers is six less than twice the smaller. Find the integers. Let the smaller be x. That means that the larger is x+2. From your statement x+2=2x-6 Solve for x. I hope this helps. Thanks for asking.

37. ## graph

x=3 how do I start to firqure this out x= 3 is a vertical line that passes through (3, 0)

38. ## religion

i have to Submit a 700-1000 word paper. The paper should be formatted following APA guidelines, and answer these questions: 1. Considering that Hinduism lacks a uniting belief system, what makes up the Hindu religion? 2. What are the cultural and societal

39. ## science

is salt water a mixture, solution or both?

40. ## history

How was children and education during 1619-1900? There is a wealth of material at these sites. http://historyeducationinfo.com/ http://www.nd.edu/~rbarger/www7/