Friday

October 9, 2015
Total # Posts: 434

**Algebra 2**

Did I perform this operation correctly? (a^2-b^2)/(a^2-2*a*b+b^2) /(2*a^2+5*a*b+3*b^2)/(2*a+3*b) = 1/a-b
*October 2, 2015*

**Physics**

What effect does the normal force have on the coefficients of friction?
*September 29, 2015*

**Physics **

A storage battery has an emf of 6.3 volts and an internal resistance of 0.01 ohm. it is to be charged for 120 amperes.hours from a 30 volt emf source having a resistance of 0.08 ohm at the rate of 20 amperes. a. compute for the resistance needed b. what is the cost of ...
*September 16, 2015*

**chemistry**

Le Chatelier's principle lab
*September 13, 2015*

**chemistry**

What assumption did you make about the reaction of KMnO4 solution in those determinations where temp didnt change to allow k to be a constant?
*September 6, 2015*

**Ebhs,maths,siswati,english and business studies**

I am frank,i have 4 credits with me namely,maths,siswati,business studies and english,am asking what courses i can take
*September 4, 2015*

**Life orientation**

Can you please help with this question which says'descrie a recent service delivery protest in your community or in the neibourhood.what are the problem that the community faced?.under the following topic:campaign with responsibility
*May 16, 2015*

**math**

At Frugal Foods a loaf of bread cost about $1 in 1980. In 2013, the loaf of bread cost $2.50. 1.A ratio is a comparison of two amounts by division. What is the ratio of the cost of a loaf of bread in 2013 to the cost in 1980? 2.50/1 2. Assuming the price of clothing increased ...
*May 14, 2015*

**chemistry**

A particular brand of toothpaste claims to contain 0.24 wt% sodium fluoride. What mass in grams of fluoride ion would be present in the average amount of toothpaste used to brush one's teeth, about two grams? Now this is a weight percent concentration question, I know that...
*May 7, 2015*

**chemistry**

As a research chimst, you are intrested in studying the extent and type of interactions in aqueous salt solution. As part of this study, you weight three samples of NaCl and dissolve each in 1.000kg H2O. You then measure the freezing temp. of each solution and compare these ...
*May 3, 2015*

**Calc**

A stone is thrown straight up from the edge of a roof, 625 feet above the ground, at a speed of 20 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 2 seconds later?
*April 21, 2015*

**math**

write an addition equation the equation must have a 1 a 2 a 3 digit added and use all of these digits 662-228-8000
*April 15, 2015*

**math/physics**

A 8 kg mass is attached to a spring hanging from the ceiling and allowed to come to rest. assume that the spring constant is 40 n/ m and a damping constant is 3 N/m. At t=0 and external force of 2 sin(2t+PI/4)N is applied to the system. determine amp, frequency and steady ...
*April 10, 2015*

**Math i need someone awesome to help! ASAP**

which measure correctly completes the statement 627 L = ? mL
*March 19, 2015*

**Geometry**

Write the equation of a circle given the following: Diameter measures 15 units and the center is at the intersection of y =x + 7 and y= 2x-5
*March 1, 2015*

**quadratic formula**

okay thank you
*February 27, 2015*

**quadratic formula**

My chemistry professor wants us to use the quadratic formula
*February 27, 2015*

**quadratic formula**

2x^2=-8x+10 I got x=-2-1i x=-2+1i But every time I plug the numbers back into the equation I am not getting the sides to equal. Not sure how to use the imaginary i.
*February 27, 2015*

**solution making/ chemistry/biotech**

I thought it did but that's all the question gives you
*February 26, 2015*

**solution making/ chemistry/biotech**

You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used? I think the answer is 37.5 by dividing 750/20 but I am not sure
*February 26, 2015*

**Solution Making**

Suppose you start with a 5X solution A, and you want a final volume of 10ul of 1X solution. How much Solution A do you need? Can you please check my work not sure. I need 2 ul of solution A to 8 ul of H2O. 5/1=.2*10=2
*February 23, 2015*

**solution making/ chemistry/biotech**

thank
*February 23, 2015*

**COMM/215**

I would like to know if i have used the correct grammar and punctuation in the following two sentences: 47. "Have you ever read the story, 'The Tell-Tale Heart' by Edgar Allen Poe?" Dave asked. 48. "Did the professor say, 'Put down your pencils'...
*January 31, 2015*

**COMM/215**

I would like to know if i have used properly structured sentences for the following: 49. To succeed in the new economy, workers will have to learn throughout their careers adapt to changing circumstances, and self-motivate when needed. 50. Some students hate math; some ...
*January 31, 2015*

**AP Calc**

find f(x), if f'(x)=2x-3 and the graph of y=f(x) contains the point (2,5).
*January 19, 2015*

**algebra**

the lenght of a rectangular is 50 feet more than the width,it the perimeter of the basketball court is 300 feet,what is the lenght of the field
*January 17, 2015*

**Intro to computers**

You have set up Remote Desktop for the company server running Server 2008 so that your users can RDP in from their XP workstations. Users are calling you saying that they are being denied the ability to remote in. What is the most likely reason? A. XP does not support Remote ...
*January 11, 2015*

**Physics**

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
*December 13, 2014*

**Physics**

An object is placed 4 cm in front of a convex lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
*December 13, 2014*

**Physics**

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
*December 13, 2014*

**Physics**

857.5hz?
*December 13, 2014*

**Physics**

What is the frequency of a sound wave in air at 20°C that has a wavelength of 0.4 m?
*December 13, 2014*

**Physics**

Thanks!!
*December 13, 2014*

**Physics**

A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)
*December 13, 2014*

**physics**

Two point charges, each 6*10-5 C, are separated by 30 cm. What is the electrostatic force produced by this arrangement?
*December 11, 2014*

**Physics**

Does P=V^2/R seem correct?
*December 11, 2014*

**Physics**

A 30 ohm resistor is connected to a 1.5 V battery. How much power is dissipated by the resistor? I'm confused of the formula to use here.
*December 11, 2014*

**Physics**

A 4 ohm resistor and 10 ohm resistor are connected in series. If this circuit is connected to a 12 V battery, how much current will flow through the circuit?
*December 11, 2014*

**Physics**

A 10 ohm resistor and a 20 ohm resistor are connected in parallel. What is the equivalent resistance of this setup? What formula do I use for this?
*December 10, 2014*

**Physics**

Aluminum has a resistivity of 2.7*10-8 Ùm. What would be the resistance of 100 m of aluminum wire with a cross-sectional area of 2*10-4 m2?
*December 10, 2014*

**Physics**

How can you demonstrate that water is denser than ice without weighing them? What is the principle involved?
*December 10, 2014*

**Calculus angle of elevation**

Bob is wrong dx/dt = 3ft/s, dƟ/dt = ? 5ft/x = tan Ɵ Differentiating each side with respect to the time: (-5ft)/x^2 dx/dt=〖sec〗^2 ϑ dϑ/dt So dϑ/dt=(-5ft)/x^2 dx/dt.〖cos〗^2 θ We want to evaluate the change at the ...
*December 9, 2014*

**chemistry**

EDTA: 292.2 1. How would you make 250ml's of a 15% EDTA solution 2.How much of solution 1(above)should be used to make 500ml's of a .1% EDTA solution.
*December 5, 2014*

**Physics**

I don't get it
*November 16, 2014*

**Physics**

A ball is thrown horizontally from the top of a building 45.9 m high. The ball strikes the ground at a point 121 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the initial velocity of ...
*November 16, 2014*

**physics**

THANK YOU I actually needed only the second part and I did the same as u but I forgot to put parentheses!
*November 16, 2014*

**physics**

A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 22.7 m/s. At the same time, it has a horizontal velocity of 58.9 m/s. At what speed does the vehicle move along its descent path? Answer in units of m/s At what angle with the ...
*November 16, 2014*

**Math**

28 inches
*November 16, 2014*

**Advanced Algebra **

The polynomial function defined by f(x) = 1 − x + x^2 − x^3 + ... + x^16 − x^17 may be written in the form f(y) = a_0 + a_1 y + a_2 y^2 + ... + a_16 y^16 + a_17 y^17, where y = x + 1 and a_i s are constants. Find a_2.
*November 15, 2014*

**Calculus**

Find the points at which y = f(x) = x^11-6x has a global maximum and minimum on the interval 0 ¡Â x ¡Â 4 Round your answers to two decimal places. Global Maximum: (x,y) = (,) Global Minimum: (x,y) = (,)
*October 29, 2014*

**physics**

Find the x- and y-coordinates of the center of gravity of a 4.00 ft by 8.00 ft uniform sheet of plywood with the upper right quadrant removed as shown in the figure below. The dimensions of the cutout are a = 4.50 ft and b = 1.70 ft. HINTS: Think of the board as being made of ...
*October 28, 2014*

**physics**

Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of...
*October 18, 2014*

**Math College (Algebra)**

How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0
*October 11, 2014*

**physics**

A 20 kg object is acted on by a conservative force given by F = -3.0 x - 5.0 x 2, with F in newtons and x in meters. Take the potential energy associated with the force to be zero when the object is at x = 0. (a) What is the potential energy of the system associated with the ...
*October 9, 2014*

**chemistry**

Suppose 1.2x10^3 kg of C is mixed with 2.4x10^5g oxygen gas and carbon dioxide forms. 1. write the reaction and balance 2.which reactant is the limiting reagent and which reactant is in excess 3. How many grams of carbon dioxide will be formed.
*September 27, 2014*

**Fractions**

How many 1/4 cup servings are in 5/6 cup of raisins?
*September 23, 2014*

**chemistry**

thank you, i forgot to convert the mols, once i put that part in. I got about the same thing as you
*September 22, 2014*

**chemistry**

A 2.556g sample of baking soda (NaHCO3)decomposes to produce 0.876g of solid sodium carbonate. Caculate the theoretical yield and the percent yield of the sodium carbonate. The equation is: 2NaHCO3(s) -> Na2CO3(s) + H2O + CO2(g)
*September 22, 2014*

**chemistry**

Calculate the number of moles of O atoms in a 2.5x10(-6)kg sample of C8H10N4O2
*September 20, 2014*

**chemistry**

thank you
*September 20, 2014*

**chemistry**

Calculate the number of C atoms in a .25mg sample of C8H10N4O2
*September 20, 2014*

**chemistry**

balanced equation =2 H(2)+ 1 O(2) -> 2H(2)O A. What mass of H2O would be produced from7.4 mg of O2 B. What is the volume of H2O would be produced from 7.4kg of O2. Density of water = 1.000g/ml
*September 20, 2014*

**Economics**

Country A is producing 4 units of X and 8 units of Y and country B is producing 4 units of X and 6 units of Y. The opportunity cost of producing more of A) good X is the same for both countries. B) good Y is the same for both countries. C) good X is lower in country A. D) good...
*September 15, 2014*

**Physics**

At some instant, a particle traveling in a horizontal circular path of radius 7.80 m has a total acceleration with a magnitude of 15.0 m/s2 and a constant tangential acceleration of 12.0 m/s2. Determine the speed of the particle at this instant(initial speed) and (1/8) ...
*September 12, 2014*

**chemistry**

You have a protein solution of 3.7mgs/ml You need to load 20ug onto a gel. How much of this solution would you use ?
*August 27, 2014*

**chemistry**

thanks that is exactly how the teacher gave us the questions
*August 27, 2014*

**chemistry**

How would I make 500 ml's of a .35M NaCI solution. MW= 58.44 ( I know how to do the first part) How many micromoles of NaCI would be present in that solution? What would be the percentage of NaCI in that solution?
*August 27, 2014*

**Math**

You ride your bike at an average speed of 8 miles per hour.how many miles can you travel in 1.5 hours?
*August 17, 2014*

**statistics**

Suppose a study is done in which several random samples of people from a population are taken and polled on the number of hours per night they sleep. It is determined that the sample proportion for those who sleep at least 8 hours a night is 36%, and the 95% confidence ...
*July 19, 2014*

**math**

Frank was a jacket that cost $60 ESA $43 what is the fraction of the amount that he that he needs to saved
*June 3, 2014*

**Science**

whats the answer 4 ?
*May 29, 2014*

**Albebra**

2 dice are rolled.What is the probability that neither both numbers are 2's or their sum is less than 6?
*May 28, 2014*

**u.s. history**

What was the prevailing economic challenge the United States faced at the start of World War II
*May 14, 2014*

**English**

Thank you very much. I still have these sentences I'm doubtful about. My doubt is whether I should use the present perfect or the simple past (considering that it is the end of the school year) 1) Exercises for literary text analyses aimed at developing lexicon have been ...
*May 12, 2014*

**English**

Can someone check the grammar in the following sentences? Thank you in advance. 1) The nuclear power station can give our town a lot of energy and jobs to people. 2) We won't be able to use the farmland near the power station because it will be polluted with chemicals. We ...
*May 12, 2014*

**C++**

The variables arr1 and arr2 have been declared as pointers to integers . An array of 10 elements has been allocated, its pointer assigned to arr1, and the elements initialized to some values . Allocate an array of 20 elements , assign its pointer to arr2, copy the 10 elements ...
*March 16, 2014*

**Math**

kim has 4/10 of a dollar. Carla has 40/100 of a dollar. Who has more money? Explain Colin has 3 quarters. He says he has less than 8/10 of a dollar. is he correct? Explain.
*March 6, 2014*

**English**

Can someone help me with these sentences? Which of them are grammatically correct? Thank you very much in advance. 1) They are not able to dance well. 2) They can't dance well 3) Are you able to play the piano? 4) Can you play the piano? 5) Were you able to find the book ...
*February 27, 2014*

**English**

Can someone explain to me the difference between angry about and angry for (when a verb follows)? I think "about" is used in sentences like: he is angry about being in jail (Would "for" be possible in this sentence?) he is angry with me for being rude to ...
*February 24, 2014*

**English**

Can someone check if the questions and the sentences are grammatical? Thank you. 1)Can you fly with a Bergonian passport? 2) Why might visitors not be welcome on Seeland? 3) What are the citizens of the Aerican Empire like? 4) What happened to Danny when he accepted his friend...
*February 20, 2014*

**English**

Yes, I wrote the sentences incorrectly: Thank you He was seen to watch the TV He is still dependent on ... but independent of.... I was so angry WITH him FOR behaving like that in front of everyone. (about behaving would be a mistake?) The teacher was annoyed WITH me FOR ...
*February 15, 2014*

**English**

Can someone check if the following prepositions/verbs are correct? Thanks 1) I couldn’t help CRYING 2) It’s no use EXPLAINING it to him; he won’t understand. 3) He was seen TO the watch. 4) I can’t afford TO BUY it. 5) Norma is anxious ABOUT making the ...
*February 14, 2014*

**eNGLISH**

Can you please tell me if the sentences are grammatically correct? e.g. "facing death" or the ability to face death Hamlet doubtful about the existence of an afterlife.
*February 14, 2014*

**English**

Can someone check these sentences, please? I thank you in advance. 1) Lady Macbeth "becomes sleepwalking" 2) Cowardice is the ability to bear the sorrows of our life and to stay alive, while courage is facing death by committing suicide 3) We can't be sure about ...
*February 14, 2014*

**math**

square root of [2+(square root of 1+k)]=square root of 5. Solve for k
*February 5, 2014*

**math**

square root of 2+(square root of 1+k)equals the square root of 5. Solve for k
*February 5, 2014*

**algebra**

square route of 2 plus the square route of 1 plus k = 2.24
*February 5, 2014*

**English**

Can someone please help me check the grammar in the following sentences? 1) I would like to inform people about the danger (after effects?) of having a nuclear power station near our town 2) I hope you will listen to our advice. 3) Animal and plant species will be in danger.
*January 27, 2014*

**SAT prep help**

If x^4=10, what it x^6?
*January 25, 2014*

**English**

Can someone of you check these sentences, please? Thank you in advance. 1Complete the sentences with the correct form of should, must or have to. 1You _________ be worried. This test is very easy. (don’t have) 2All the students _________arrive on time. (must) 3In my ...
*January 24, 2014*

**English**

Can someone check if the following questions are grammatically correct? Thank you. 1)Please Henry the VIII rule by focusing on the following: -Why he broke ties with the church -What the Act of Supremacy established -What political and social changes the reformation brought ...
*January 20, 2014*

**English**

Can someone tell me what's the British for the words "common trash barrels", "sorted trash", "regular kitchen" trash or food/garden waste? Thank you I'm quite environmentally friendly. I have three containers at home into which to sort my ...
*January 14, 2014*

**English**

Can someone help me with these sentences, please? Thank you very much in advance. I use the Internet to conduct school research, use translation programmes, use an online homework agency, do online shopping, play games, chat with my friends, send private instant messages, log ...
*January 9, 2014*

**English**

Can someone check these sentences, please? I need to prepare them for Tomorrow. 1) Air pollution is mainly caused by gases from factories and car exhaust fumes. It can cause acid rain, breathing problems and it can increase the risk of cancer. 2)The destruction of the ozone ...
*January 8, 2014*

**English**

Just one more thing. Which of the following sentences are grammatical? Thank you very much for your cooperation. 1.I spent most of my holiday at home. 2. I spent the greatest part of my holiday at home. 3. I mainly/mostly stayed at home during my holiday. 4.For the most part, ...
*January 7, 2014*

**English**

Are both skiing Holiday and ski Holiday possible? Thank you.
*January 7, 2014*

**EARTH SCIENCE**

the answer to 1 is not D!
*January 7, 2014*

**English**

Can you tell me if the expression the most part of my holiday is a mistake? I used it once instead of the greatest part of.. Thank you.
*January 7, 2014*

**math**

if 3a+3(b+1)=c, what is b+1 in terms of a and c?
*December 21, 2013*