Questions Asked on
June 3, 2007

Maths
Hi, can someone give me the answer to this question: secAtanA=1/4. Find cosA I got: CosA=4(1sinA) Is my answer good? Now multply each side by (1+sinA) CosA(1+sinA)=4 cos^2 A CosA=1/4 (1+sinA) 16(1sinA)=1+sinA 15=17SinA So you have sinA, now find Cos A
asked by Shym 
algebra
3ax^2  27a You can factor that into 3a (x^2  9), which also equals 3a(x3)(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,
asked by dez 
Algebra
Solve the following linear inequality graphically. x+2y
asked by Graphing Help! 
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)=2x2
asked by Jaime 
physics
A 12 kg mass on a horizontal frictionfree 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
asked by naomi 
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
asked by Ed 
Algebra
Evaluate the expression x to the 4th power2x to the 3rd power+5x squared+10x+12 for value of x=2 52
asked by Need Help 
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
asked by koeit 
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
asked by Stacy 
MATHSgeometry
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
asked by NIcole 
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
asked by Danielle 
Algebra
Solve the system.4x+3y=11 and3x 2y=4 x= 2 and y = 1 678/987
asked by Linda 
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
asked by julia 
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.
asked by Ashley 
Math
y = 6 when x = 2 y varie directly with x. what equation relates x and y? x/y = 2/6
asked by Jasmine 
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! :)
asked by anonymous 
science Please HURRY!!
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:
asked by Madison 
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
asked by alfred 
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
asked by Christi 
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
asked by Ashley 
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 nonuse of
asked by maurice 
science
Are there similarities between mixtures, elements and compunds? Please help!! Thanks!! all are matter, in one form or another. Are there anymore similarities?
asked by Kimberly 
Algebra
Multiply(x2)(x+2) X^2  4
asked by Desperate 
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
asked by Jinal 
Algebra
Solve the following system of linear inequalities by graphing. 3x+4y=0 Try this site: http://www.purplemath.com/modules/ineqgrph.htm
asked by Graphing Help! 
math
I do not understand how to Give the fivenumber 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/Fivenumber_summary start by putting the numbers in order. 1,2,4,5,5,7,7,8,8,8,9 The
asked by Wendy 
history 1
How were the children and their education during 16191900? http://en.wikipedia.org/wiki/History_of_education
asked by Nicole 
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.
asked by Steven 
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
asked by Anonymous 
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
asked by patti 
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
asked by jas 
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
asked by jas 
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
asked by bill 
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.
asked by Julie 
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
asked by London 
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=2x6 Solve for x. I hope this helps. Thanks for asking.
asked by Jaime 
graph
x=3 how do I start to firqure this out x= 3 is a vertical line that passes through (3, 0)
asked by patti 
religion
i have to Submit a 7001000 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
asked by mike 
science
is salt water a mixture, solution or both?
asked by al 
history
How was children and education during 16191900? There is a wealth of material at these sites. http://historyeducationinfo.com/ http://www.nd.edu/~rbarger/www7/
asked by Nicole 
math
can someone write out the equations so i can solve it. Please... #1 A biologist recorded 9 snakes on 21 acres in one area and 13 snakes on 47 acres in another area. Let y be the number of snakes in x acres. Write this one in a linear equation for the
asked by jas 
Words
Directions: Put () around the stressed syllable in each word pair. Example:(rec)tangle and rec(tan)gular 1. electric electricians 2. history prehistoric 3. specify specific 4. restore restorations 5. certify certification I don't know how to look for this
asked by Holly = )