Friday
February 12, 2016

Posts by Lina

Total # Posts: 217

pre-calculus
find all values of x in (o, Pi) that satify the given equation cos x/3=1/2
April 3, 2012

pre-calculus
Rewrite the expression so that it involves the sum or difference of only constants and sines and cosine to the 1st power (cos 5x)^2
April 3, 2012

pre-calculus
use a sum or difference formula to find the exact of the trigonometric function cos(-13pi/12)
April 3, 2012

pre-calculus
Rewrite the expression so that it involves the sum or difference of only constants and sines and cosine to the 1st power (sinx)^4
April 3, 2012

Geometry
Write a two column proof. Given: angle STV is congruent to angle TVU, angle STU is congruent to angle UVS. Prove: Angle SVT is congruent to angle UTV.
February 25, 2012

math
a rectangle has an area of 360 square .what .it is 20 centimeters long.what is its perimeter
January 27, 2012

Physics
A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
October 6, 2011

Physics
A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
October 6, 2011

Physics
A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
October 6, 2011

Physics
A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
October 6, 2011

Physics
A long solenoid ( radius = 1.8 cm) has a current of a 0.33 A in its winding. A long wire carrying a current of 22 A is parallel to and 1.2 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
October 6, 2011

3rd grade math
31+7
September 6, 2011

geometry
A rectangular garden 10m * 18m . Find the area of a sidewalk that is 2m from the side of a garden ?
June 21, 2011

geometry
How many boxes that is 5" * 4" * 3" could be placed inside a big box of 40" * 32" * 24" ??
June 21, 2011

Physics
The mass of an astronaut is 72kg. (a) what is his weight on earth ( taking g to be 10N/kg) ? (b) if the astronaut is on the moon's surface where the acceleration due to gravity is one-sixth on the earth , calculate (I) the mass (ii) the weight of the astronaut Thanks for ...
June 2, 2011

Physics
Thanks !!! :)
June 2, 2011

Physics
A lift is pulled up to the top of a building by a constant force of 6400N at a constant speed of 2m/s. It takes 3mins to reach the top. (a) how much work is done in raising the lift to the top of the building ? (b) what is the power required ?
June 2, 2011

Chemistry
How will the equilibrium: Heat energy + CH4 + 2H2S = CS2 + 4H2 be affected by the following? a) A decrease in temperature? b) The addition of H2 c) The removal of some CH4 d) An increase in the volume of the container e) The addiotion of a catalyst. i know that [CH4] goes up...
May 31, 2011

economics
what cause the financial crisis that occurred in 2008
May 12, 2011

Maths SUPER URGENT
Thanks. Talked to my Dad. Told me to assume that the down pipes had a width of 200mm as this is for a school auditoriam. @ drwls. Yes, the roof area has already been taken into account @ bobpursley. how would i design for max rainfall? The school is in the desert.
May 8, 2011

Maths SUPER URGENT
Hey What size down pipe would I need, and how many if my roof area equals 1224.78 metres squared and I have average rainfall of 173kl per year? Also how much plumbing would I need from my hypothetical tanks?
May 8, 2011

Microecinomics
Opportunity cost is represented by what you're losing by choosing one option. For example, by going to the movies your opportunity cost is doing your homework. Therefore, the opportunity cost of producing potatoes is 50 chickens. The opportunity cost of producing chickens ...
March 25, 2011

Chemistry for Engineers
A gas is confined to a container with a massless piston at the top. (Part C figure) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 4.90 to 2.45 L. When the external pressure is increased to 2.50 ...
March 25, 2011

chemistry
A gas is confined to a container with a massless piston at the top. (Part C figure) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 4.90 to 2.45 L. When the external pressure is increased to 2....
March 25, 2011

pre algebra
If the question is what is the product of (8x^5-5x)(7x^3) you can find this by using the FOIL method. i.e-(8x^5)(7x^3)-(5x)(7x^3)= 56x^5+3-35x1+3= 56x^8-35x^4
March 25, 2011

math
Speed of gravity: 9.8meters/second Given 0.02 seconds, you can use conversion method. 9.8m/s*0.02seconds=0.196meters
March 25, 2011

Algerbra
This is a system of equations. x-y=8 x+y=-2 The easiest way to solve would be the elimination method because it is already set up; if you add the equations, the y cancels out and gives you: 2x=6 Further, x=3 Given x you can find y in any equation above; x-y=8 Substitute the 3...
March 25, 2011

math
Anonymous is right. m is the slope of the line and b is the y intercept. So the graph will have a negative slope of (rise/run) -2/3 and it will cross the axis at y=45
March 25, 2011

Algebra
Well, you could multiply everything by 100 to get an easier function: y=-3x^2+14x+143 in which you could try and use the quadratic theorem [-b +/- sqrt(b^2-4ac)]/2a Giving you: -14 +/- sqrt(196-(-1716)/-60 [-14 +/- sqrt(1912) ]/-6 You cant simplify too much. But you get the ...
March 25, 2011

world history
Many early historians tended to look at the past in terms of
March 3, 2011

physiC
A uniform door (0.81 m wide and 2.1 m high) weighs 150 N and is hung on two hinges that fasten the long left side of the door to a vertical wall. The hinges are 1.9 m apart. Assume that the lower hinge bears all the weight of the door. Determine the magnitude and direction of ...
March 1, 2011

world history
Which of the following was the first known king of Mesopotamia? A. Sargon B. Lipit-Ishtar C. Hammurabi D. Gilgamesh
February 26, 2011

Health, Safety, and Nutrition (Penn Foster)
How dare you direct me to that web site for cheating!!!!!!!!!
February 14, 2011

Health, Safety, and Nutrition (Penn Foster)
Health, Safety, and Nutrition 1. Today in class you’re going to talk to your students about Vitamin C and what it does for a person’s body. From which one of the following food groups should you select your snack for today? A. Bread, cereal, rice, and pasta group B. ...
February 14, 2011

child development
Thanks Ms. Sue
February 14, 2011

child development
B?
February 14, 2011

child development
(Penn Foster) 1- Neueon development and elaboration, which occurs between birth and age 10, is prompted by: A -aural prompts from the famiy school and environment. B-physical movement on the part of the child C- Intake of foods rich in vitamins and minerals D- exposures to ...
February 14, 2011

world history
i need the answers too!
February 14, 2011

8th grade History
Have a nice Day.
February 3, 2011

8th grade History
Thank you
February 3, 2011

8th grade History
However, thank you for answering my questions. Have a good day! :-)
February 3, 2011

8th grade History
i already did go to google. there is nothing. I searched and searched.
February 3, 2011

8th grade History
my teachers say not to go there. :(
February 3, 2011

8th grade History
Wikipedia is not a reliable source. Please do not enter wikipedia.
February 3, 2011

8th grade History
Where was the site of the Battle of Fort Sumter in the Civil War? Thanks!
February 3, 2011

8th grade History
Thanks Jeff!
February 3, 2011

8th grade History
Where was the site for the Battle of Gettysburg in the Civil War? Thanks!
February 3, 2011

8th grade science
I need help figuring out this on a food web. It goes from a flower to a butterfly to a frog to the bird to a coyote. Now I have to label them. I got them all however i do not know what the frog and bird is. HELP!! :-)
February 1, 2011

8th grade science
No because they eat primary consumers. Thanks!
February 1, 2011

8th grade science
Can a secondary consumer be eaten by another secondary consumer? Thanks! :-)
February 1, 2011

8th grade science
*please post your question some other place where it can be properly answered and so can mine. Thank you.*
January 19, 2011

8th grade science
For my quiz some of these questions confuse me. Your genome is over 99% identical to every other human on earth. True False 3 points Save All living things on earth share certain identical sequences of bases on their genome. True False and... Question 8 3 points Save The bases...
January 19, 2011

8th grade Math
:)
January 13, 2011

8th grade Math
Also please do NOT tell me the answer but show me how to solve it. Thanks everybody!
January 13, 2011

8th grade Math
Hi I need help with my math problem. It is: Name the function rule from the table given. Table- X= Y= -4 4 -2 2 0 0 answers: y = -x y = -4 y = 2x y = x I do not get how to solve this problem!
January 13, 2011

math
help me in my math worksheet
January 12, 2011

8th grade science
thanks everybody you helped me a whole lot! :)
January 5, 2011

8th grade science
I only have one way that the Man-o-War defends them self, their stingers. I need one more way. But my search engine only provides that way. :( Also when the Man-o-war gives birth this happens asexually. but i also need to answer the question how do the man - o- wars find a mate??
January 5, 2011

8th grade science
Wow that helped a lot! Thanks, can I ask you another question if you do not mind?
January 5, 2011

8th grade science
Hi! For a research project from my science class I'm having trouble trying to find an answer to the following problem. How does the Man-o-War care for their young? Thanks!
January 5, 2011

8th grade science
thanks i finshed that really helped a lot. :)
January 5, 2011

8th grade science
thank you.
January 5, 2011

8th grade science
HI! I need help with detremining how long my essay should be. It has to be from 4-5 minutes long. Thanks!
January 5, 2011

Math
Tim ate some chocolate cake for an afternoon snack He left 3/4 of the cake. If his parents ate 1/3 of the remaining cake for dinner, write a multplication problem to represent how much cake tims parentd ate
December 2, 2010

math
How many 2 inch squares can be placed completly on a rectangular board that is 12 inchea wide and 16 inches long?
December 2, 2010

Pen Foster Child Care
WOW maybe you shouldnt be taking this course. Those questions are the easiet questions. Good Luck!
November 28, 2010

Statistics
1. A large video rental chain recently decided to change its rental policy, allowing an unlimited return date instead of requiring that movies be returned the next day. The marketing team reasoned that this would greatly increase the popularity of their stores, and also that ...
November 22, 2010

5th grade social studies
Question: What time period or movement began in the textile industry? I am really confused about this questions. My answer was the time period of the 18th century. Is this correct? Question: What is an economic system based on machinery rather than animal or human power during...
October 26, 2010

math
18.2 i think
October 17, 2010

Caring for school age childres
choices- A. Peers B. family C. elementary school teachers D. Child care providers
October 8, 2010

Caring for school age childres
The formation of children's core values is most strongly influenced by
October 8, 2010

Science
This is a follow up on my other question: I need help on Mitosis, and cell reproduction.
October 1, 2010

chemistry
Sorry, can't help! Would if i could, really!
October 1, 2010

Science
I forgot my book in my desk and have homework over the weekend!! HELP ME!
October 1, 2010

biochemistry
Calculate the pH change of 10mL of HCl added to 1M phosphate buffer in 1L with initil pH of 7.2?
September 28, 2010

7th grade math
28 bags of each
May 12, 2010

chem
Calculate the ph of a buffer solution that is 0.10M in ammonia and 0.15M in ammonium chloride .kb for ammonia is 1.8*10^-5
May 12, 2010

penn foster child growth and development
D-
April 22, 2010

Physics
For constant acceleration, how does the average velocity for an interval compare with the instantaneous velocity at half-time in the interval?
February 16, 2010

6th grade
a fish
November 3, 2009

physics
Your spaceship lands on an unknown planet. To determine the local value of g, you ask a steel-toed crew member to kick a stone, and you find that if she kicks it at 18.0m/s at various angles, the maximum range she can achieve is 30.8m. What is g on this planet? How long was ...
September 15, 2009

algrebra
6-9g-27+6g -3g-21
September 14, 2009

math156-proportions
cross multiply. So for #1 It becomes (4)(5) = 15x in the next step. then continue to find X
September 14, 2009

Pre-Algebra
(7y)(5z) = 35yz (-10r)(5s) = -50rs
September 14, 2009

physics
A man stands on the roof of a 19.0 m-tall building and throws a rock with a velocity of magnitude 30.0 m/sat an angle of 42.0 degrees above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock. Calculate the magnitude ...
September 14, 2009

language arts
breaking it down into simpler structure would be: The boy tricked the girl subject is boy.
August 31, 2009

algebra
distribute the 5 first x+9=20x-10 combine like terms 19=19x x= 19/19 x=1
August 31, 2009

physics [vectors]
The concept i get, but somehow i just can't execute this problem, please help me! You are given vectors A = 5.5 6.2 and B = - 3.7 7.4 . A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 19.0. I need x and y ...
August 30, 2009

Calculus
this is how you plug it in: [(x + Δx)^2 + 1- (x^2 + 1)]/(Δx) Rework the equation to get: Δx + 2x, in it should be lim as Δx goes to 0, and that would leave you with 2x, which if you used easy method, leaves you with same answer.
August 30, 2009

statistics
females males 26 33 35 40 75 50 63 32 36 28 71 39 54 32 68 33 37 31 48 36 42 26 43 37 73 38 55 21 47 39 71 48 27 38 56 36 37 59 25 59 88 53 42 59 33 35 66 38 45 24 53 28 46 45 74 28 58 23 51 15 58 61 48 31 48 17 42 55 55 31 50 55 61 37 28 36 41 20 58 48
August 10, 2009

statistics
A researcher has observed independent samples of females and males, recording how long each person took to complete his or her shopping at a local mall. The respective times, in minutes, are listed in file. Using the 0.025 level of significance in a one-tail test, would ...
August 10, 2009

statistics
Please only the formula and steps to do this problem. Thank you An assembly process includes a torque wrench device that automatically tightens compressor housing bolts; the device has a known process standard deviation of ó = 3 lb-ft in the torque applied. A simple ...
August 2, 2009

statistics
Please only the formula and step I need for this problem. thank you In response to media inquiries and concerns expressed by groups opposed to violence, the president of a university with over 25,000 students has agreed to survey a simply random sample of her students to find ...
August 2, 2009

statistics
Please, give the formula and steps to do this problem. Thank you The average length of a flight by regional airlines in the United States has been reported as 299 miles. If a simple random sample of 30 flights by regional airlines If The average length of a flight by regional ...
August 2, 2009

statistics
If a sample of size 30 is selected, the value of A for the probability P(t greater or less A) = 0.01 is?
August 1, 2009

statistics
If a sample of size 30 is selected, the value of A for the probability p(t¡Ý A)= 0.01 is?
August 1, 2009

Statistics
8.11) For the manufacturing plant discussed in Exercise 8.10, the union president and the human resources director jointly select a simple random sample of 36 employees to engage in a discussion with regard to the company’s work rules and overtime policies. What is the ...
July 23, 2009

Statistics
For the manufacturing plant discussed in Exercise 8.10, the union president and the human resources director jointly select a simple random sample of 36 employees to engage in a discussion with regard to the company’s work rules and overtime policies. What is the ...
July 22, 2009

Statistics
city law enforcement has state that 20% of items sold by paywn within city stolen john purchase 4 items from city pawn shop for x=the number of john purchase that have been stolen how I can determine:a P(x=0, b P(2<=x), cP(1-<x-<3) and d P(x-<2).. Try
July 21, 2009

Statistics
how you can use sampling distribution and the concept of Central Limit Theorem to apply information and make good predictions and estimations when you shop for a particular item or product?
July 20, 2009

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