Sunday

September 21, 2014

September 21, 2014

Total # Posts: 773

**Chemistry**

A voltaic cell consists of Ag/Ag+2 electrode E= 0.80 and a Fe+2/Fe+3 electrode E=0.77 with the following initial molar concentrations: [Fe+2}= 0.30 M [Fe+3]= 0.10 M [Ag+]=0.30 M. What is the equilibrium concentration of Fe+3? (Assume the anode and the cathode solutions are of ...
*July 20, 2012*

**ECONOMICS**

abcd
*July 19, 2012*

**math**

How often do you run red lights? How does this lead to an erroneous conclusion?
*July 12, 2012*

**Algebra**

convert english measurements to metrics L 134 in W 124 in H 92 in I took these three and multiplied them by 2.54cm I got 889cm. I need to find the volume in cubic centimeters. If each dimension (L,W,H) is doubled, what happens to the volume of the room?
*June 27, 2012*

**Physics **

A block of mass 20g sits at rest on a plate that is at the top of the fluid on one side of a u-tube as shown in figure P10.38. The u tube contains two different fluids with densities p1= 1000 kg/m^3 and p2= 600 kg/m^3 and has a cross sectional area of A= 5.0 x10^-4 m^2. If the...
*June 27, 2012*

**Algebra**

a gallon of paint covers 350 square feet, how many do I have to buy to cover 560,444 square feet?
*June 27, 2012*

**math**

A locker combination has three nonzero digits, and digits cannot be repeated. If the first digit is 3, what is the probability that the next digit is odd?
*June 20, 2012*

**Economics**

An increase in the tax rates on the underground will have no effect on tax revenue since 0 x tax rate = 0. Since the underground is not reported or illegal. However, underground goods and services will now be cheaper since the other goods and services will be more expensive ...
*June 19, 2012*

**Precalculus**

You have a total of 820 feet of fencing to enclose a large retangular larea and divide it into four smaller pens of the same dimensions. The fencing used to divide the large pen must be parallel to the same side of the large rectangle. Maximize the total rectangular area (...
*June 19, 2012*

**finance**

how do we end up with salvage value if the item is depreciated the cost of the item either over a period of years or all in one year? How does salvage value work?
*June 15, 2012*

**Algebra 2**

Log27+log27(x+8) = 2/3
*June 13, 2012*

**Algebra 2**

log5 (log3³)
*June 13, 2012*

**Algebra 2**

Log² x + log² 3 = 1
*June 13, 2012*

**Algebra 2**

log² 16 = x
*June 13, 2012*

**Physics Equations of Motion**

90.5x10^3 doesn't sound reasonable since it's a ratio but i went ahead and tried it and it didn't work i believe you have to combine the equations of motion i'm just not sure how to do it!
*June 7, 2012*

**Physics Equations of Motion**

Along a straight road through town, there are three speed-limit signs. They occur in the following order: 66 , 31 , and 19 mi/h, with the 31 -mi/h sign located midway between the other two. Obeying these speed limits, the smallest possible time tA that a driver can spend on ...
*June 7, 2012*

**Calculus AP**

oh 4/2 is 2. ok thanks
*June 4, 2012*

**Calculus AP**

i mean my answer is -1/(x+1)
*June 4, 2012*

**Calculus AP **

i wanna KNOW IF im DOING RIGHT. Evaluate the difference quotient for the given function. Simplify your answer. f(x)=x+3/x+1, [f(x)-f(1)]/(x-1) simplify my answer: [(x+3)/(x+1) - (1+3)/(1+1)]/(x-1) = [x+3/x+1 - 4/2] / (x-1) = [2(x+3)-4(x+1)/2(x+1)] / (x-1) = [2x+6-4x-4/2(x+1...
*June 4, 2012*

**Algebra 2**

9x²+4y²-18x+16y-11=0
*June 1, 2012*

**Algebra 2**

x²+6x-4y+1=0
*June 1, 2012*

**math**

an account which pays 14% compounded quarterly, what is the effective rate of yield?
*May 23, 2012*

**Health, Safety ,and Nutrition**

Flexability
*April 28, 2012*

**Statistics/Research**

Please do not respond to this question
*April 25, 2012*

**Calculus AP **

5.2 The Natural logarithmic function Differentiate the function problem # 13: f(x)= sqrt(x) Inx
*April 18, 2012*

**calculus**

a projectile is fired upward from the ground to reach 64 feet. What is the velocity when it is 48 feet above the ground
*April 17, 2012*

**Math**

Kirk has 25 marbles and 14 seashells. What information is needed to find the number of marbles that are NOT cat's eyes?
*April 16, 2012*

**physics**

A ball is thrown upward with an initial velocity of 6.0m/s by someone on top of the building 34m tall who is leaning over the edge so that the ball will not strike the building on the return trip. (a) How far above the ground will the ball be at the end of 1.0s? (b) What is ...
*April 10, 2012*

**stats**

The per capita consumption of coffee by people in the United States in a recent year was normally distributed, with a mean of 24.2 gallons and a standard deviation of 8.1 gallons. What proportion of people in the U.S. drink more than 20 gallons of coffee a year?
*April 6, 2012*

**Math**

Jan, Mya, and Sara ran a total of 64 miles. Jan and Maya ran the same amount and Sara ran 8 less then Maya. How many miles did Sara run?
*April 4, 2012*

**Statistics**

5.54134
*March 20, 2012*

**math**

How could you use the product of 1/5x 40 to find the product of 4/5 x 40?
*March 19, 2012*

**physics **

How far does a point on the circumference travel if the wheel is rotated through an angle of 26.2 rev?
*March 9, 2012*

**Physics **

How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 26.2°?
*March 9, 2012*

**physics**

A wheel has a radius of 4.56 m. How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 26.2°?
*March 8, 2012*

**physics **

A horizontal circular platform (m = 108.1 kg, r = 3.25m) rotates about a frictionless vertical axle. A student (m = 85.3kg) walks slowly from the rim of the platform toward the center. The angular velocity, omega, of the system is 2.5 rad/s when the student is at the rim. Find...
*March 8, 2012*

**Physics **

A figure skater is spinning with an initial angular speed of 6.9rad/s. She then pulls her arms in, reducing her moment of inertia to 0.38 times its original value. What is her angular speed after pulling in her arms?
*March 8, 2012*

**Physics **

A CD has a mass of 17.0 g and a radius of 5.98 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 19.1 rad/s in 0.744 s. Assuming the CD is a uniform solid disk, determine the net torque acting on it.
*March 8, 2012*

**Geometry**

An A-frame house is 40 feet high and 30 feet wide. Find the angle that the roof makes with the floor. Round the angle nearest degree.
*March 6, 2012*

**Geometry**

Guy wires 80 feet long support a 65 foot tall telephone pole. To the nearest degree, what angle will the wires make with the ground?
*March 5, 2012*

**physics **

A mercury barometer reads 744 mm on the roof of a building and 769 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building.
*March 5, 2012*

**physics **

A jet of water squirts out horizontally from a hole near the bottom of the tank, as seen in the figure below. Assume that y = 1.19 m and x = 0.544 m. What is the speed of the water coming out of the hole? The hole has a diameter of 3.06 mm. What is the height, h, of the water ...
*March 5, 2012*

**Physics **

A mercury barometer reads 744 mm on the roof of a building and 769 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building.
*March 5, 2012*

**Stats**

When sampling is done for the proportion of defective items in a large shipment, where the population proportion is 0.18 and the sample size is 200, what is the probability that the sample proportion will be at least 0.20
*March 4, 2012*

**teen alcohol abuse**

It is a small topic and I am supose to write a gobal issue and I picked that. *Writeacher*
*March 1, 2012*

**teen alcohol abuse**

I am doing a research outline for it and I have all my notes and everything but I do not know where I should put my infor mation on my paper even though I have a guide line. (English is my worst subject) Here it is this is all I have help please .... Research Paper Outline I. ...
*March 1, 2012*

**Physics **

A jet of water squirts out horizontally from a hole near the bottom of the tank, Assume that y = 1.19 m and x = 0.544 m. What is the speed of the water coming out of the hole?
*March 1, 2012*

**poetry**

who are the "fools" mentioned in the poem "Trees"; poets, gods, trees, robins
*February 29, 2012*

**physics **

Can someone please help me solve this: An 7.74g bullet is fired into a 320g block that is initially at rest at the edge of a frictionless table of height h = 1.07 m The bullet remains in the block, and after the impact the block lands d = 2.07 m from the bottom of the table. A...
*February 27, 2012*

**algebra**

A shipping clerk wishes to determine the weights of each of the 4 boxes. Each box weighs a different integer amount less than 70 kg. Unfortunately, the only scales available measure weights in excess of 70 kg. The clerk therefore decides to weigh the boxes in pairs so that ...
*February 23, 2012*

**Calculus**

If it takes 90N to stretch a spring 1/2 m beyond equilibrium, use an integral to find how much Work it takes to stretch the spring 5m beyond equilibrium
*February 20, 2012*

**Calculus**

integrate (27x -9x^2)/sqrt(x^3 +9)
*February 20, 2012*

**math**

find the whole-number possibilities for the lengths of the bases of a trapezoid with a height of 1m and an area of 3m squared. Explain how you found your answer
*February 15, 2012*

**Math**

The hourly operating cost of an airplane, which seats up to 405 passengers, is estimated to be $5,500. If an airline charges each passenger a fare of $100 per hour of flight, find the hourly profit P it earns operating the airplane as a function of the number of passengers x...
*February 9, 2012*

**Math**

The hourly operating cost of an airplane, which seats up to 405 passengers, is estimated to be $5,500. If an airline charges each passenger a fare of $100 per hour of flight, find the hourly profit P it earns operating the airplane as a function of the number of passengers x...
*February 9, 2012*

**Perimeter**

A rectangle has a perimeter of 12m. If each side is a whole number of meters, what are the possible dimensions for the length and width?
*February 8, 2012*

**algebra**

what is the expression that best represents the side of a square with the area of 100x^4y^8
*February 6, 2012*

**accounting**

Recently Boeing has maintained a cash balance of over $6 billion. At an annual inflation rate of about 2 percent, does cash have more or less purchasing power at the end of a given year than at the beginning? By how much? Is such a gain or loss reflected on the company’s ...
*February 3, 2012*

**algebra**

Use scientific notation to divide the following two numbers. Express the answer using scientific notation; retain at least three decimal places. (6.2 · 10^7) / (4.15 · 10^3)
*January 29, 2012*

**ALGEBRA**

A chemist is asked to make 10 liters of a a35% solution. She has only a 10% solution and a 50% solution to work with. how much of each solution must she mix to ge 10 liters of the 35% solution?
*January 28, 2012*

**Health**

Who all is held responsible for the completeness of medical records and what are some reasons that cause them to be incomplete?
*January 26, 2012*

**intermediate algebra**

need the equation for this problem. Mike invested $706 for one year. He invested part of it at 5% and the rest at 3% at the end of the year he earned $28.00 in interest. How much did mike invest at each rate of interest
*January 19, 2012*

**chemistry**

Use the periodic table to identify what type of chemical bond is involved in each of these compounds: NaF,NO2, CBr4, and MgS. Explain your reasoning.
*January 18, 2012*

**Chemistry**

So are u implying that the of moles of O2 is wrong? How do u calculate molar mass?
*January 16, 2012*

**Chemistry**

What is the volume of 128 g of Oxygen at STP?... here's my work... O=16 128/16= 8 moles 8(22.4) = 179.2 L Where did i go wrong?
*January 16, 2012*

**Chemistry**

So do u multiply 12.044 by 2 again to get 2 moles?
*January 16, 2012*

**Chemistry**

Given 80g of Calcium reacts with Fluorine at STP, how many atoms of Fluorine are consumed? Heres the formula: Ca (s) + F(subscript 2) --> CaF(subscript 2) How do i do this? Thanks! Jackie
*January 16, 2012*

**physical science**

Write a brief essay on the topic of volcanic activity and climate change. Consider such questions as whether there is there a link between volcanic eruption and climate change and what the relationship between the two may be. Research and find a minimum of two resources to ...
*January 11, 2012*

**Algebra 1**

5x/(x^2 – 25)
*January 6, 2012*

**C Programming**

I need help creating a program that uses a menu with options to enter student information (name, ID, GPA), print student information, or quit the program. Use data files and FILE pointers to store and print information entered.
*January 2, 2012*

**Math**

John delivers newspapers he makes $5 the first week and $2 are added to his pay each week he delivers papers. Which expression could be used to find out how much he would make in a given week, w, after the first week? a) 2w+5 b) 2(w-2)+5 c) 2(w-1)+5 d) 5w-2
*December 19, 2011*

**Chemistry**

Consider the reaction: 3Ba(s)+N2(g)--->Ba3N2(s) 1)How many moles of barium metal react to produce 0.190 mol of barium nitride? 2)How many moles of nitrogen gas react?
*December 14, 2011*

**English**

If Virgil and Aeschylus had a conversation about women, how would it go based on the stories Aeneid and Agamemnon?
*December 14, 2011*

**Physics, Kinematics**

Nevermind, you just accidentally switched the velocity and time. It's (1/2)(15.1+25.8)*(28.7) and (1/2)(25.8)*37.1. Thank you so much for your help! I can't believe I didn't see that before.
*December 1, 2011*

**Physics, Kinematics**

That isn't correct. Any other thoughts on this problem?
*December 1, 2011*

**Physics, Kinematics**

You drive with a constant speed of 15.1 m/s for 23.4 s. You then accelerate for 28.7 s to a speed of 25.8 m/s. You then slow to a stop in 37.1 s. How far have you traveled? I've tried dividing this into 3 parts. 1st- constant speed 15.1m/s*23.4s=353.34 m 2nd-accelerating I...
*December 1, 2011*

**Physics**

Thank you so much, you guessed right without the figure. I really appreciate the help!
*December 1, 2011*

**Physics**

A popular carnival ride consists of seats attached to a central disk through cables. The passengers travel in uniform circular motion. As shown in the figure, the radius of the central disk is R0 = 3.00 m, and the length of the cable is L = 1.43 m. The mass of one of the ...
*December 1, 2011*

**math**

Ed Long promised to pay his son $400 semiannually for 12 years. Assume Ed can invest his money at 6% in an ordinary annunity. How much must Ed invest to pay his son $400 semiannually for 12 years? 24 periods, 3% (Table 13.2)
*November 16, 2011*

**math**

You borrow $90 from Grandma. You pay back $15 a week. Write an equation in standard form that represents the amount owed(y) after x weeks.
*November 15, 2011*

**3rd grade math**

There is a pattern. The owner part goes 1-2-1-2-1-2-1 so the next owner would be 2. The pets go up by one every 2 people so it would be 3. 2 owners, 3 pets each
*November 15, 2011*

**Shirley English 3 rd grad**

My daughter is working on Fragments and Correcting Run ON Sentences by SCV, SCS, and SS and she did not bring home her book. I have no idea what SCV and SCS and SS means! Can you please help?
*November 10, 2011*

**Stats**

I'm having some trouble with a stats portion of an animal behavior lab. We have to do chi-sqaure tests to test 3 hypothesis, which are 1) percent prey captured will decline as prey group size increases 2) percent successful hunts will decline as prey group size increases 3...
*November 3, 2011*

**Algebra**

Write the slope-intercept equation for the line that passes through (-3,-15)and is perpendicular to -6x+8y=3
*November 2, 2011*

**math**

what is the perimeter of triangle 8746
*October 26, 2011*

**Chemistry **

for a) there is a 1:1 ratio. The bolts are the limiting reactant (which means you will run out of them before you use up all of the other) therefore you can only have 75 NB molecules. b) for every N2B you have to have 2 nuts to every 1 bolt which is a 2:1 ratio so you divide ...
*October 24, 2011*

**Chemistry please help :)**

A 1.10 sample of dry ice is added to a 745 mL flask containing nitrogen gas at a temperature of 25.0 degrees C and a pressure of 735 mm Hg . The dry ice is allowed to sublime (convert from solid to gas) and the mixture is allowed to return to 25.0 degrees C. What is the total ...
*October 24, 2011*

**Chemistry **

The balanced equation is Mg+2HCl->H2+MgCl2 but I can't recall how to find the moles. Sorry, hope I helped a little!
*October 24, 2011*

**Physics**

After fixing a flat tire on a bicycle you give the wheel a spin. Its initial angular speed was 7.35 rad/s and it rotated 15.0 revolutions before coming to rest. What was the average angular acceleration? For what length of time did the wheel rotate?
*October 23, 2011*

**Math**

Prove that if "a" is a unit in a ring R with unity, then "a" is not a zero divisor in R.
*October 20, 2011*

**statistics**

what is a t-test
*October 17, 2011*

**math**

If H is a subgroup of G, and K is a normal subgroup of G, prove that: HK = KH
*October 14, 2011*

**math**

Thank you very much!!!!!!!
*October 11, 2011*

**math**

Show that Sn is non-abelian for n>=3
*October 11, 2011*

**Geometry**

One endpoint of a line segment is (8,-1). The point (5,-2) is one-third of the way from that endpoint to the other endpoint. Find the other endpoint.
*October 1, 2011*

**geometry**

Find the point that is one-fourth of the way from (2,4) to (10,8).
*October 1, 2011*

**Sociology**

I am having some trouble with a sociology assignment concerning research methods. I know this is not a subject covered on this site, but I do not know of any sites for help in this area. If you know of any or have knowledge in this area, then your help would be greatly ...
*September 29, 2011*

**MATH**

commutativity
*September 29, 2011*

**College Abstract Algebra**

If H is a subgroup of G and K is a normal subgroup of G,prove that HK = KH
*September 29, 2011*

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