Wednesday
September 17, 2014

Posts by ANON


Total # Posts: 1,345

AP Calc B/C
Find the arc length of one arch of the sine curve. I started it by doing y=sinx, y'=cosx arc length= integral of sqrt(1+cos^2x)dx from pi/2 to 3pi/2 but I don't know how to integrate that! Thank you!
September 13, 2014

Accounting - General
Should a capital asset that is increasing in value be depreciated?
September 4, 2014

Physics
A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both reach the edge of a 7.8 m waterfall. If the spy's speed is 11 m/s and the officials' speed is 22 m/s...
September 2, 2014

Social Studies
In return for offering the throne to William and Mary, it was demanded that all laws had to be approved by? A: Parliament B: King James C: The Catholic Church D: The Protestant Church My answer is A. Can someone please check if this is right?
August 28, 2014

English
I'm writing an essay. Is this semi-colon used appropriately or should it be a new sentence? At the age of six, India seemed like a completely different world to me; they had a different way of life than anything I had ever been exposed to.
August 25, 2014

geography
why is the world round, but look flat???????
August 25, 2014

AP Calc
When a chain hangs under its own weight, its shape is catenary. The equation of a catenary with a vertex on the y-axis is y=e^x+e^-x. Find the length of the chain from x=-2 to x=2. Then use the same technique from Problem #8(Previous AP calc problem I posted) to find the ...
July 31, 2014

AP Calc
The picture to the right shows the Ben Franklin Bridge which stretches across the Delaware River joining Pennsylvania and New Jersey. The center span of the bridge is about 4200 feet long. The suspension cables hang in parabolic arcs from towers 750 feet above the surface of ...
July 31, 2014

calc
q 0 125 250 375 500 625 750 C'(q) 27 35 41 45 43 46 51 Give fixed cost = 8800 and cost of producing 250 units is 17425, how much would the total cost increase if production were increased one unit, to 251 units? --- A cup of coffee at 90 degrees celsius is put into a 30 ...
July 21, 2014

math
add 12 to both sides of the equation, and you get this: q-12+12=89+12 q=101
July 17, 2014

HVAC/R
So what they are saying is that if the ANSI standard happens to be adopted by OSHA, THEN it has the "force of law". Is that what you are reading/interpreting? And that would mean that both are correct...
July 17, 2014

HVAC/R
I know Technician B is correct, but is Technician A also correct? Is there any "force of law" carried with these standards?
July 17, 2014

HVAC/R
Oops sorry - it's either Technician A or Technician B, or Neither or Both. Who is correct? Both of them? Or Neither? Or A or B?
July 17, 2014

HVAC/R
Two technicians are discussing the HVAC/R field. Technician A says that industry codes that require certain types of installation practices carry the force of law with them. Technician B says that ANSI is an organization that establishes codes for the HVAC/R field. Which one ...
July 17, 2014

statistics
Lebron
July 12, 2014

math
Let ABCD be a cyclic quadrilateral. Let P be the intersection of \overline{AD} and \overline{BC}, and let Q be the intersection of \overline{AB} and \overline{CD}. Prove that the angle bisectors of \angle DPC and \angle AQD are perpendicular.
July 2, 2014

spelling
Hi, learning math facts and equations can definitely be difficult. Atleast I know it was for me! A great way to practice and increase the abilities of your memory are using flash-cards or playing a couple rounds of the game memory.
July 1, 2014

Physics
What is the total pressure, in atmospheres, of a 10.0 L container that contains 10 moles of nitrogen gas and 10 moles of oxygen gas at 300 K? I tried using PV=nRT and added both P together but kept getting the wrong answer. n=10, T=300 K, V=1x10^-3 m^3
June 26, 2014

Geometry
Two altitudes of a triangle have lengths 12 and 14. What is the longest possible length of the third altitude, if it is a positive integer?
June 23, 2014

Chemistry
Check my answer please? A reaction requires 22.4 L of gas at STP. You have 45.0 L of gas at 100 kPa and 373 K. Which of the following statements is true? The gas constant is 8.31 L-kPa/mol-K. You will have an excess of gas and the reaction will occur. <--------- You will ...
June 3, 2014

math algebra?
Is 1/3 , 3/4 , 0.2 in order from least to greatest or is 5 1/8 , 5 1/4 , 5 2/3 in order from least to greatest?
June 2, 2014

physics
Second hand = 1 rpm: 1/60 rps; i.e. 1/60 cycle/s; i.e. 1/60 Hz
May 26, 2014

Physics
Did you ask this on YA!, cuz somebody answered it 50 minutes ago just google your question and it'll come up
May 26, 2014

Geometry
mh = 40 m = (8+10)/2 = 9 9h=40 h = 40/9
May 25, 2014

intro to computers
You are shopping for a new computer. You see the memory listing as 1GBX4. What does this mean? A. 4 DDR first generation DIMMs B. 1 GB of memory made up of 4 DIMMs C. 4 GB of memory made up of 4 DIMMs D. 1 DDR fourth generation DIMMS ????
May 24, 2014

intro to computers
1.You want to purchase a new hard drive for your workstation and are deciding between an HDD and SDD drive. Which of the selections below is NOT an advantage that SDD has over HDD? A. They don’t get fragmented. B. They create less noise. C. They create less heat. D. They ...
May 24, 2014

computers
Which type of USB connector is always plugged into the computer to connect an external device? a. type A B. type B c. Micro d. Mini
May 24, 2014

Calc
A patient receives a 3 ml dose of medicine. The amount, y, of medicine in the body decreases at a rate of 15% per hour (dy/dt=-.15y). When the medicine in the patient is down to 1 ml, the nurse administers a second 3 ml dose and plans to give the patient a third dose when the ...
May 11, 2014

Calculus
For the parabola y^2=4px, where p, the focal length, is a constant, the focal point, f(p,0), is on the x-axis. Point S is 10 units from the point F and the segment SF makes a 60degree angle with the x-axis. The slope of segment TF is twice the negative of the slope of the ...
May 11, 2014

chemistry
The oxygen from the air could cause the hydrogen to ignite.
May 9, 2014

math
ms. sue that is a link to a different question
May 7, 2014

CALCULUS
The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of equal volume by a plane ...
April 29, 2014

CALCULUS HELP PLZ
The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of equal volume by a plane ...
April 29, 2014

statistics
Some students were asked, "Would you date someone with a great personality even though you did not find that person to be attractive?" Of the 131 women surveyed, 61.1% said yes, and of the 61 men surveyed, 42.6% said yes. Is there sufficient evidence to conclude that...
April 26, 2014

statistics
A researcher believe that college students spend a different amount of time talking on the phone than they do instant messaging. She takes a random sample of 12 college students and records the number of hours per week each student spends on each activity and plans to test at ...
April 26, 2014

Maths
Cheater! I am doing the maths challenge too and this isn't fair to the other students.
April 26, 2014

math, calculus
1. Consider the region bounded by the curves y=|x^2+x-12|, x=-5, and x=5 and the x-axis. A. Set up a sum of integrals, not containing an absolute value symbol, that can be used to find the area of this region. B. Find the area of the region by using your answer from part A. ...
April 23, 2014

Math
We are learning about proofs. We drew lines between noncollinear points. Our table showed 2 points >> 1 line segment, 3 point >> 3 line segments, 4 points >> 6 line segments, 5 points >> 10 line seg, 6 points >> 15 line seg. etc. Write an ...
April 12, 2014

Physics (Rotation)
In the figure, wheel A of radius rA is coupled by belt B to wheel C of radius rC. The angular speed of wheel A is increased from rest at a constant rate α. Find the time needed for wheel C to reach angular speed ω assuming the belt does not slip. (Hint: If the belt ...
April 12, 2014

Science/Biology
Please check my answers: 1. Which of the following correctly states the relationship between monkeys and humans? A. Humans and monkeys evolved from apes. B. Humans evolved from monkeys. C. Humans and monkeys evolved from the same ancestor, which is now extinct. D. Humans ...
April 4, 2014

English
List as many details as you can for each of the topic sentences. 1. Walking briskly for a mile after a day sitting at a desk helps dispel fatigue. Purpose: To explain 2.Bird watching in the woods is relaxing as well as educational Purpose: To convince
April 3, 2014

Science
anyone at all?
April 3, 2014

Science
please help me
April 3, 2014

Science
fill in the blank questions monotremes, marsupials, and placentals have the same _____ known as the therapsid. a farmer sprays insecticide on his crops and notices that the insect pest problems disappear. a year later he tries the same insecticide only to find that he did not ...
April 3, 2014

calculus and vectors
Determine an equation of the line of intersection of the planes 4x − 3y − z = 1 and 2x + 4y + z = 5.
April 1, 2014

Math
Use the following four coordinates to determine which one has a distance of 10 units from point C (1, 2). (3, 4) (7, 1O) (6, 7) (8, 9)
March 26, 2014

Economics HELP PLEASE!!!!
Yes how about this one? Suppose that firms are NOT owned by consumers. Let s denote the size of the per-unit subsidy/tax given to the firms. Let positive values of s denote subsidies, and negative values of s denote taxes. QUESTION: What is the value of s that maximizes total ...
March 21, 2014

AP Calc
The base of a solid is bounded by y=|x|+a, <a<, and the line y=3. Find, in Cu. units in terms of a, the volume of the solid if every cross section perpendicular to the y-axis is an equilateral triangle.
March 18, 2014

AP Calc
If x=e^t and y=t^2-3, then for what values of t, t>=0, is the function y=f(x) concave up?
March 17, 2014

AP Calc
The coordinates of the point on the curve cos(y)=x-y, -pi<=x<=pi, where the tangent line to the curve is a vertical line is ____.
March 17, 2014

AP Calc
The base of a solid is the region in the first quadrant bounded by the ellipse x^2/a^2 + y^2/b^2 = 1. Each cross-section perpendicular to the x-axis is an isosceles right triangle with the hypotenuse as the base. Find the volume of the solid in terms of a and b. I'm having...
March 17, 2014

AP Calculus
Approximating the integral from 0 to 6 of (e^x dx) by 3 circumscribed rectangles of equal width on the x-axis yields ____. a) 2e^2 + 4e^4 + 6e^6 b) 2(e^2 + e^4 + e^6) c) 2(e + e^3 + e^5) d) e + 3e^3 + 5e^5 e) e^2 + 3e^4 + 5e^6
March 17, 2014

AP Calculus
The average area of all squares with sides between a inches and b inches (b>a) is ____ in^2.
March 16, 2014

AP Calculus
The base of a solid is bounded by y =|x|+a, 0<a<3, and the line y=3. find in cu. units in terms of a, the volume of the solid if every cross section perpendicular to the y-axis is an equilateral triangle.
March 16, 2014

CALCULUS ECONOMICS
??
March 13, 2014

science
An atom of sodium-23 (atomic number = 11) has a positive charge of +1. Given this information, how many electrons does it have? How many protons and neutrons does this atom have?
March 9, 2014

science
A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion?
March 9, 2014

Probability
Anyone know answer to 2?
March 7, 2014

Geometry
In baseball, the length of the path between each pair of consecutive bases is 90 feet. The paths form right angles. How far does the ball need to travel if it is thrown from home plate directly to second base? A. 90 feet B. 127.3 feet C. 135.7 feet D. 180 feet
March 6, 2014

MATH
I agree with tbetzz
March 5, 2014

MATH
But why would you subtract the 576 and 144. and plus to find the circumference you were supposed to times the 576 by pi and the 144 by pi
March 5, 2014

Physics
its 54.7 km/s
March 4, 2014

Geometry
A trapezoid has a perimeter of 14 feet. What will the perimeter be if each side length is increased by a factor 7? A. 21 feet B. 98 feet C. 196 feet D. 686 feet This one is def B correct?
March 2, 2014

Geometry
A rectangle has an area of 6 square meters. What will be the area of the rectangle if each side length is increased by a factor 5? A. 11 square meters B. 30 square meters C. 125 square meters D. 150 square meters I think the answer is B
March 2, 2014

Geometry
Is it D?
March 2, 2014

Geometry
A rectangular prism has a base that is 5 cm by 7 cm and a height of 12 cm. If all dimensions are doubled, what happens to the volume? A. When the dimensions are doubled, the volume is twice the original volume. B. When the dimensions are doubled, the volume is three times the ...
March 2, 2014

Geometry
A triangle is enlarged by a factor of 3. The perimeter of the new triangle is 36 feet. What could be the lengths of the sides of the original triangle? A. 3 feet, 4 feet, and 5 feet B. 1.5 feet, 1.25 foot, and 1.25 foot C. 2 feet, 0.5 feet, and 1.8 feet D. 4 feet, 4 feet, and ...
March 2, 2014

Geometry
The circumference of a circle changes from 20 to 4 after a dilation. What was the scale factor of the dilation? A. 1/25 B. 1/5 C. 5 D. 25
March 2, 2014

Geometry
A circle with a radius of 1/2 ft is dilated by a scale factor of 8. Which statements about the new circle are true? Check all that apply. A.The length of the new radius will be 4 feet. B.The length of the new radius will be 32 feet. C.The new circumference will be 8 times the ...
March 2, 2014

Geometry
What is the height of a cylinder with a volume of 384π cubic inches and a radius of 8 inches? Round to the nearest tenth of an inch.
February 28, 2014

Geometry
A cylindrical water tank has a diameter of 20 feet and a height of 15 feet. How much water is needed to fill the tank?
February 28, 2014

math- calculus
You will often see proj (Vector a onto Vector b) written as projb⃗ a⃗ .Show that projb⃗ a⃗ =(a⃗ ⋅b⃗/ b⃗ ⋅b⃗ )*b⃗ .
February 26, 2014

physics
(a) A car with a mass of 950 kg is moving to the right with a constant speed of 1.45 m/s. What is the total force on the car? (b) What is the total force on the car if it is moving to the left?
February 21, 2014

math
A stairway runs up the edge of the pyramid. From bottom to top the stairway is 92 m long. The stairway makes an angle of 70° to the base edge, as shown. A line from the middle of one of the base edges to the top of the pyramid makes an angle of elevation of 52° with ...
February 20, 2014

Black Death
I have to do a powerpoint on the Black Death. Where can I find the best information to write about it?
February 19, 2014

Geometry
Is it B?
February 17, 2014

Geometry
How does the volume of a rectangular prism change if the width is reduced to 1/10 of its original size, the height is reduced to 1/4 of its original size, and the length is reduced to 2/3 of its original size? A. V=1/120lwh B. V=1/60lwh C. V= 2/3lwh D. V=3/4lwh
February 17, 2014

MATH
David wants to reduce a rectangular image on his computer so that the new image has 25% of the area of the original image. How should David modify the image? Justify your answer.
February 17, 2014

MATH
Drew has a rectangular postcard that is 6 inches long and 4 inches wide. He uses a photocopier to enlarge it, so that the length and width are 1.5 times as long as those of the original postcard. Explain how the perimeter and area change.
February 17, 2014

Geometry
Thank you so much oh my god
February 17, 2014

Geometry
How does the volume of a square pyramid change if the base area is quadrupled and the height is reduced to 1/9 of its original size? A. V= 1/27Bh B. V= 4/27Bh C. V= 2/9Bh D. V= 4/9Bh
February 17, 2014

Geometry
but that's not a choice. A. 1/6 B. 1/3 C. 3 D. 6
February 17, 2014

Geometry
The volume of a square pyramid is equal to _____ times the volume of a cube where the bases are the same, but the square pyramid is half the height of the cube.
February 17, 2014

Geometry
If a cylinder’s radius and height are each shrunk down to a third of the original size, what would be the formula to find the modified surface area?
February 17, 2014

Calc
Find the coordinates of the point on the curve xy=6 in quadrant I where the normal to the curve passes through the origin.
February 16, 2014

calc
The slope of the tangent to the curve y=f(x) is given by (1/9)(x^2)(y^2). The curve passes through the point (3,1). Find the value of y when x=3*cubedroot(3).
February 16, 2014

Calc
it wasn't a typo.. how did you get 10?
February 15, 2014

Calc
Let f be the function that contains the point (-1,8) and satisfies the differential equation dy/dx=10/(x^2+1) (a) Write the equation of the tangent to f at x=-1. (b) Use your equation in part a to estimate f(0). (c) We know that the integral from -1 to 0 of 10/(x^2+1) equals ...
February 15, 2014

Geometry
Andrea has a yard shaped like parallelogram ABCD. The garden area, parallelogram EFGB, has an area of 105 ft. If Andrea wants to sod the rest of her yard, how many square feet of sod should she order? A. 765 ft B. 840 ft C. 945 ft D. 1,515 ft
February 9, 2014

Math :-)
Explain why knowing the height is needed when finding the perimeter of a right triangle.
February 9, 2014

Geometry
Maria is making a stained glass window in the form of a kite. The width of the window must be 15 in., and she only has enough stained glass to cover 60 in. What should the height of the window be? A. 4 in. B. 6 in. C. 8 in. D. 12 in.
February 9, 2014

Classical mechanics
Hi juanpro is there other classical mechanic. I might want to join too.
February 7, 2014

Plz, plz help! SS
Whats that Nicole M??
February 5, 2014

english/writing
does my thesis statement make sense? is it clear? any suggestions are welcomed In "The Love Song of J Alfred Prufrock," T.S. Eliot used Prufrock to symbolize modern man's fruitless struggle to find self-worth, love, and insecurities of owns appearance. thank you! :D
February 4, 2014

biology
"ide","ite","ate"
February 4, 2014

Business/ Computers
Hello I'm doing a powerpoint on the history of computers for business but I just have to look for people. Do you mind giving me a website that would be perfect to find all these people? 1. Blaise Pascal 2. Wilhelm Schickard 3. Christopher Sholes 4. George Stibitz 5. ...
February 3, 2014

Science (Chemistry)
After submitting the answer, this is what I received as feedback. The system is marking that the amount of moles of precipitate was incorrect, although when I did the problem originally I got the same number that you did. I am just posting this feedback for future reference, ...
February 2, 2014

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
February 2, 2014

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
February 2, 2014

science
Write a balanced equation to describe the following reactions: a) C14H30 is cracked to produce ethene, hydrogen and one other compound b) C16H34 is cracked to produce ethene and propene in a 2:1 ratio and only one other compound
February 1, 2014

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