Wednesday
October 1, 2014

Posts by Sarah


Total # Posts: 4,005

AP Calculus
I asked this yesterday and someone answered. but i didn't understand the explanation.. Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find equations of these two circles. I got (x-1)^2+(y-2)^2=16 and (x-4.36)^2+(y+1.36)^2=16
September 12, 2013

Math
plug in 4 for x, and -3 for y. 4-4(-3)/2 4+12/2 16/2 8
September 12, 2013

math
At 4 pm, Jack who is 6 ft tall cast a shadow that is 4 1/2 ft long. At the same time, a nearby free cast a shadow that is 12 ft long, how tall is the tree?
September 12, 2013

AP Calculus
A projectile fired upward from ground level is to reach a maximum height of 1,600 feet. What is its initial velocity?
September 11, 2013

AP Calculus
Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find equations of these two circles. I found the derivative of y^2=4x, but i don't know what to do next!
September 11, 2013

Computer Science
The array represents a map with coins, and the integers represent a row and column location of a coin gatherer. The gatherer is greedy and lazy when deciding to which adjacent location (either up, down, left, right) to move next. It’s greedy because it moves to the ...
September 8, 2013

Physics
A firefighter 41.8m away from a burning building, directs Zach stream of water from a ground level fire hose at an angle of 33.0 degrees above the horizontal . If the speed of the streams it leaves the hose is 42.7m/s, at what height will the stream of water hit the building
September 8, 2013

Physics
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the two naturally occurring electrons is removed. The radius of the orbit is 2.65 10-11 m. Determine the magnitude of the electron's ...
September 8, 2013

Physics
A circular surface with a radius of 0.058 m is exposed to a uniform external electric field of magnitude 1.49 104 N/C. The electric flux through the surface is 74 N · m2/C. What is the angle between the direction of the electric field and the normal to the surface?
September 8, 2013

Physics
In the rectangle in the drawing, a charge is to be placed at the empty corner to make the net force on the charge at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner? (the rectangle has +3 uC charges in ...
September 8, 2013

Physics
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the two naturally occurring electrons is removed. The radius of the orbit is 2.65 10-11 m. Determine the magnitude of the electron's ...
September 8, 2013

Math
A projectile is fired with an initial velocity of v0 feet per second. The projectile can be pictured as being fired from the origin into the first quadrant, making an angle O with the positive x-axis. If there is no air resistance, then at t seconds the coordinates of the ...
September 8, 2013

Physics
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the two naturally occurring electrons is removed. The radius of the orbit is 2.65 10-11 m. Determine the magnitude of the electron's ...
September 6, 2013

Physics
A circular surface with a radius of 0.058 m is exposed to a uniform external electric field of magnitude 1.49 104 N/C. The electric flux through the surface is 74 N · m2/C. What is the angle between the direction of the electric field and the normal to the surface?
September 6, 2013

physics
A is the bottom left corner. The empty corner is the top right corner.
September 6, 2013

physics
In the rectangle in the drawing, a charge is to be placed at the empty corner to make the net force on the charge at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner? (the rectangle has +3 uC charges in ...
September 6, 2013

Physics
Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.30 m. A third point charge q = +8.5 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...
September 6, 2013

Physics
A circular surface with a radius of 0.058 m is exposed to a uniform external electric field of magnitude 1.49 104 N/C. The electric flux through the surface is 74 N · m2/C. What is the angle between the direction of the electric field and the normal to the surface?
September 6, 2013

Physics
A circular surface with a radius of 0.058 m is exposed to a uniform external electric field of magnitude 1.49 104 N/C. The electric flux through the surface is 74 N · m2/C. What is the angle between the direction of the electric field and the normal to the surface?
September 6, 2013

Physics
The drawing shows a positive point charge +q1, a second point charge q2 that may be positive or negative, and a spot labeled P, all on the same straight line. The distance d between the two charges is the same as the distance between q1 and the spot P. With q2 present, the ...
September 6, 2013

Science
Outline a step-by-step method for determining the density of a baseball. Please help with this too! Thanks
August 31, 2013

Science
Estimate the length of a baseball bat and mass of a baseball in SI units. How can you check how close your estimates are? Please help! Thank you
August 31, 2013

Physics
When point charges q1=+8.4uC and q2=+5.6uC are brought near each other, each experiences a repulsive force of magnitude 0.66N. Determine the distance between the charges.
August 28, 2013

Physics
When point charges q1=+8.4uC and q2=+5.6uC are brought near each other, each experiences a repulsive force of magnitude 0.66N. Determine the distance between the charges.
August 28, 2013

Physics
When point charges q1=+8.4uC and q2=+5.6uC are brought near each other, each experiences a repulsive force of magnitude 0.66N. Determine the distance between the charges.
August 28, 2013

Physics
Displacement vector A points due east and has a magnitude of 2.26 km. Displacement vector B points due north and has a magnitude of 2.62 km. Displacement vector C points due west and has a magnitude of 2.6 km. Displacement vector D points due south and has a magnitude of 2.6 ...
August 26, 2013

Maths
Heather loves roses.In her rose garden she has half as many pink roses as red,and four times as many red ones as white.There are 37 roses that are either yellow or white.Twenty are yellow.How many roses are in Heather's garden? Help me out please anyone
August 24, 2013

Maths
Twenty-four ladybirds were sitting at various places around the garden.One sixth of the ladybirds flew away to settle in the garden.Half of the remaining ladybirds sat on a yellow sunflower.Then half of those on the sunflower flew onto a fence post.There were no ladybirds on ...
August 24, 2013

Maths
Twenty-four ladybirds were sitting at various places around the garden.One sixth of the ladybirds flew away to settle in the garden.Half of the remaining ladybirds sat on a yellow sunflower.Then half of those on the sunflower flew onto a fence post.There were no ladybirds on ...
August 24, 2013

Math
Let F(x)= X^2+ 5 and G9x)= (x+1) / (x-1). Find (a) F-3G and (b) F(g(x))
August 22, 2013

Math
I really want to understand factoring, and I have a problem and the answer but I don't understand the steps to getting an answer. 3x^5-12^4+18x^3
August 22, 2013

Biology (Science)
Which of the following is not true about a hypothesis? 1) Previous knowledge can help support it. 2) It is a tentative explanation. 3) It can be proven to be false. 4) It must be testable to be useful. 5) It can be proven to be true. I know for sure that 2 and 4 is not the ...
August 21, 2013

Biology (Science)
John uses mechanical "predators" to approach frogs at a pond shore, and he records the distance between predator and frog as the frogs jump. (PEER REVIEW) On a walk around pond John sees that small frogs on the shore only allow him to get within 5 feet before jumping...
August 21, 2013

Math
Find an equation of the tangent line to the circle x^2+y^2=25 at the point (4,-3)
August 20, 2013

MAth
Is this undefined?
August 20, 2013

MAth
find equation of line which passes through the points (5,7) and (5,-8).
August 20, 2013

leadership
In your leadership model, what are the a leader's most important task? What are the core values that your leadership model emphasized?
August 15, 2013

leadership
what are the core values that your leadership model emphasizes? In what ways does my leadership model reflect existing scholarship on leadership and in what ways is my approach unique to me? what barriers and opportunities exist towards the implementation of my personal ...
August 15, 2013

chemistry
no im wrong, the ph will not decrease.
August 13, 2013

chemistry
Can the ph of a buffer solution of potassium hydroxide decrease when exposed to air overnight? I'm pretty sure the answer is yes
August 13, 2013

Chemistry
If you have a di or polyprotic buffer state below whether you see evidence of this in the form of your pH curve. If you do not see evidence of this, explain why this should be the case Wouldn't you see evidence of a di or polyprotic buffer if there are multiple ...
August 13, 2013

physics
A hot-air balloon is rising upward with a constant speed of 2.80 m/s. When the balloon is 9.48 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?
August 13, 2013

chemistry
I do mean spilled, thanks.
August 7, 2013

chemistry
That is excellent thank you. Now you have given me the answer working through it myself makes a lot more sense. Can you help me with the one below as well. A 25.0 mL solution of HCl has been spilt. It took 21.8 mL of saturated 2.5 M NaOH to neutralise the acid. What was the ...
August 7, 2013

chemistry
Can one calculate the number of moles of air? If so, calculate the number of moles in 1 kg of air (making sure your calculation, units and assumptions are fully explained); If not, explain why it is not possible to calculate the number of moles of air.
August 7, 2013

chemistry
A 25.0 mL solution of HCl has been spilt. It took 21.8 mL of saturated 2.5 M NaOH to neutralise the acid. What was the molar concentration of the acid?
August 7, 2013

maths
Determine the acute angle between the line passing through the points A(-2;1/5) and B(0;1) and the line passing through the points C(1;0) and D(-2;6)
August 6, 2013

Physics
Why is it highly unlikely to find an ion with a charge less than -4 or greater than +4? I need examples of different types of ions and evidence to support the logic using the concepts of ionization energy and electronegativity.
August 6, 2013

Math
during the warranty period, 6% of their computers are returned because they have defective keyboards, 5% are returned because they have defective disk drives, and 1% are returned because both the keyboard and the disk drive are defective. What is the probability that a ...
July 27, 2013

math
sorry,i 'm not understand the number 4,4,4 either
July 27, 2013

math
complete the pattern : 1/2 , 3/4 , 1 , 4 , 4 , 4
July 27, 2013

math
it's the right answers,that's why i cannot figure it out
July 27, 2013

math
the iceman found recently in a glacier was a first thought to be about 5300 years old.Roughly when did he have his 14th birthday?2700bc,300bc,3700bc,5300bc or 7300bc
July 27, 2013

math
i don't understand what is x of y alone ,
July 27, 2013

math
if a number x is 10%of y and z,and z is 3 times of y.What % is x of y alone? 1)3.3% 2)2.5% 3)5% 4)4%
July 27, 2013

math
complete the pattern:50,20,8,4,4,4.
July 23, 2013

Spain History
I'm doing a survey for my class to get opinions to see which side people favored the most, the Nationalists or the Republicans? I have interviewed the people I know but I'm still lacking.
July 23, 2013

Spain History
Which side would you support in the Spanish Civil War and Why?
July 23, 2013

world geography
Why are some bodies of water in Russia unnavigable for part of the year? They are frozen. They are too shallow. They are too swift. They contain chernozem.
July 22, 2013

math
would u please explain,thanks
July 21, 2013

math
a taut wire of length'w'emits a single note when plucked.if it were half as long it would emit the same note but one octave higher.how long should the same wire be to emit the same note but one octave lower?which gives the biggest answer?1)2.3x8 2)3.4x7 3)4.5x6 4)5.6x5...
July 21, 2013

math
in the number 0.123451234512345......(recurring)what is the 1992th digit after the decimal point
July 21, 2013

math
when tessa and fatima run a 100 metre race,tessa wins by 10m.then they repeat the race,this time with tessa starting 11m behind the starting line.if both girls run at the same speed as efore,what would be the expected result?
July 21, 2013

Chemistry 3A
An aqueous solution contains the ions B, C, and D that are in equilibrium with one another according to the reaction B (aq) + C (aq) ->/<- D (aq) A certain amount of water is added so as to double the volume of this solution, while keeping the temperature and the ...
July 21, 2013

math
A GARDEN places some lilies in a pond.he does this on the first day of the month of september.the lilies double in volume every day until on the last day of the month,the pool is full.on what day of the month was the pool half full of lilies?
July 21, 2013

math
thanks,but what is 3^2,is it 3time 2 or square root of 3
July 20, 2013

math
2 people start off to work directly away from each other.they each walk for 4 kms then turn directly to their right and walk for another 3 kms.how far apart are they
July 20, 2013

math
5 people measured a metal bar using the same measuing instrument,but each read the scale to a different level of accuracy.their 5 answers are show below.4 of them are correct(to the chosen level of accuracy),but one is not.which is the odd one out?1)244mm 2)243mm 3)243.7mm 4)...
July 20, 2013

math
a quiz has 25 questions with 4points awarded for each correct answer and 1 point deducted for each incorrect answer,with zero for each question omitted.John scores 77points.how many questions did he omit?
July 20, 2013

math
as a regular customer in my favourite restaurant,i get 10%discount.but to the cost of the meal must be +17.5%gstand 12%service charge.if the %are to be worked out in turn(which each%-addition or discount-being on the previous answer),which order of working leaves me the least ...
July 20, 2013

math
it takes 3weeks to build a large garage.if it takes 2/3 of a week to construct the frame and 5/4 of a week to put the roof on.how much time is spent on the rest of the construction?
July 20, 2013

english
“Boys don’t cook.” What type of rhetorical device or fallacy is this? :“…what are you doing in those overalls? You should be in a dress and camisole, young lady!” what type of rhetorical device or fallacy is this?
July 19, 2013

english
The older you grow the more of it you’ll see. The one place where a man ought to get a square deal is in a courtroom, be he any color of the rainbow, but people have a way of carrying their resentments right into a jury box. As you grow older, you’ll see white men ...
July 19, 2013

english
"There's four kinds of folks in the world. There's the ordinary kind, like us and the neighbours, there's the kind like the Cunningham's out in the woods, the kind like the Ewell's down at the dump, and the Negroes." what rhetorical device or ...
July 19, 2013

english
to kill a mockingbird movie analysis question. 1) how does the lack of eye contact show Mayella is lying? Why is she lying? How does this show racism?How is this significant to the film? analysis further toward the so what factor. Thanks
July 18, 2013

psy
suppose you wanted to do research on how best to gradually charge the behavior of a fearful child. Which of the following theorist are you likely to come across in your resarch
July 15, 2013

Math
Simplify the complex fraction: [(4/(x-5))+(2/(x+2))]/ [((2x)/(x^2-3x-10))+3]
July 12, 2013

Social Studies
It can be said that one of the greatest contributions of the Moors was religious tolerance. Do you believe that is true? If so, why is it then that some people view Muslim culture to be a culture of intolerance?
July 10, 2013

math
OMG I CAN NOT get this !!!! Purchase price of article = $495 Down payment = $50 Number of payments = 36 True annual interest rate = 18% Monthly payment amount = $ The formula is I= 2YC ________ M(N+1) y = the number of payments made in a year. m = the amount financed or how ...
July 10, 2013

math
When I worked this problem out I got the answer $250.80. It was graded wrong. Can you explain what I did wrong. A deposit of $8,000 at 9.5% for 120 days $
July 10, 2013

math
When I worked this problem out I got the answer $250.80. It was graded wrong. Can you explain what I did wrong. A deposit of $8,000 at 9.5% for 120 days $
July 10, 2013

math
Loan Amount: $15,000 Method of payment: discount basis Amount of Interest : $650 Term of loan: 1 year Effective Rate of Interest (to the nearest tenth): I tried to work this out but I got it completely WRONG !!
July 10, 2013

Answered myself lol
Never mind I worked this out myself
July 10, 2013

math
Number of dinners = 125 Individual portion = 8 oz. Size of can = 32 oz. Number of cans required = I got 31.25 buttt you can't have 31.25 cans lol !
July 10, 2013

math
Labor rate = $12 per hour Hours worked = 36 Overhead rate = 125% Retail price of good furnished = $185 Sales tax rate = 7% Total bill for services and parts = $ The answer that I got was 762.80. Can you check my answer.
July 9, 2013

math
For some reason the computer keeps saying my answer is wrong.
July 9, 2013

math
A sphere has a radius of 3.5 inches. Volume (to the nearest tenth) = cubic inches The answer that I got was 179.6. It is wrong ! i I miss a step?
July 9, 2013

math
12= 6in. 16= 8 in. 18= 9 in ! Thank you !
July 9, 2013

math
Suppose you want to represent a triangle with sides 12 feet, 16 feet, and 18 feet on a drawing where 1 inch = 2 feet. How long should the sides of the triangle be in inches? The sides of the triangle on the drawing should be inches, inches, and inches.
July 9, 2013

math
I hope I will too. Math isn't my strongest subject.
July 9, 2013

math
Sorry if I am on here a lot. I just nee a lot of help an I really have to pass this class .
July 9, 2013

math
Thank you.! I was a decimal point off !
July 9, 2013

math
Your station charges $16.50 for a lubrication job. As a promotion you sell six coupons for lubrication jobs for $90. What percentage discount are you offering for customers who purchase the 6-coupon lube book? Discount (to the nearest tenth) = % The answer I got was 9% & my ...
July 9, 2013

math
The total price of an article is $7.02, including tax. If the tax rate is 8%, what is the retail price of the article?
July 9, 2013

math
Purchase price of article = $3,000 Down payment = $0 Number of payments = 36 Monthly payment amount=$93.33 True Annual Interest (to the nearest tenth) = a0 %
July 9, 2013

english
what motivates us as writers and viewers to create and interact with characters through pieces of work such as " a beautiful mind" (movie. This is our essay question. what topic and 3 arguments could i talk about in my essay
July 9, 2013

math
Purchase price of article = $5,555 Down payment = $555 Number of payments = 42 True annual interest rate=18% Monthly Payment= $
July 8, 2013

Math
Loan Amount: $15,000 Method of payment: discount basis Amount of Interest : $650 Term of loan: 1 year Effective Rate of Interest (to the nearest tenth): %
July 8, 2013

Math
Is the price 549.95?
July 8, 2013

Math
It's all one whole question! Can you just tell me the steps to solve each one you do not have to tell me the answer! I just need to know how to get the answer so I will know how to do this problem again ..
July 8, 2013

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