Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 253

**chemistry**

You have to prepare a pH 5.00 buffer, and you have the following 0.10M solutions available: HCOOH, HCOONa, CH3COOH, CH3COONa, HCN, and NaCN. Which solutions would you use? HCOOH HCOONa CH3COOH CH3COONa HCN NaCN
*March 23, 2015*

**chemistry**

Is sodium isotonic with Mg²+
*January 23, 2015*

**Algebra**

Tell whether the each statement is sometimes, always or never true 1) If n is zero then x^-n is 1 2) If n is negative integer then x^-n=1 3) If x is zero then x^-n is 1 4) If n is an integer then x^-n>1
*December 12, 2014*

**Advanced math**

Find the Fourier sine expansion of the function sin(x) - sin(4x)
*November 17, 2014*

**physics**

The figure below shows a plot of potential energy U versus position x of a 1.30 kg particle that can travel only along an x axis. (Nonconservative forces are not involved.) In the graphs, the potential energies are U1 = 10 J, U2 = 35 J, and U3 = 50 J.
*October 22, 2014*

**calculus**

Find the points of the paraboloid z=x^{2}+y^{2}-1 at which the normal line to the surface coincides with the line joining the origin to the point. What is the acute angle betwwen the normal and the z-axis at these points?
*October 18, 2014*

**calculus**

A cable runs along the wall from C to P at a cost of $3 per meter, and straight from P to M at a cost of $5 per meter. If M is 16 meters from the nearest point A on the wall where P lies, and A is 50 mters from C, find the distance from C to P such that the cost of installing ...
*October 18, 2014*

**calculus**

Find the points of the paraboloid z=x^{2}+y^{2}-1 at which the normal line to the surface coincides with the line joining the origin to the point. What is the acute angle betwwen the normal and the z-axis at these point
*October 18, 2014*

**calculus**

Will u please answer it with detailed
*October 18, 2014*

**calculus**

how would you represent the area outside given y= 4cos(2theta) but outside y=4 ?
*October 18, 2014*

**Algebra**

detremine whether the relation is a function or not 1)y=-15 2)x=5 3)((1,0),(1,4),(-1,1)) 4)((6,3),(5,-2),(2,3)) PLEASE EXPLAIN WITH DEETAILED
*October 18, 2014*

**Algebra**

CRITICAL THINKING Explain how you know that the slope of the line through (4, 5) and (4, 5) is positive without calculating.
*October 18, 2014*

**algebra 1**

Adding 3w-4 on both sides 3w-4+4=18-3w+3w-4 3w=14 dividing both sides by 3 3w/3=14/3 w=14/3
*October 17, 2014*

**calculus**

ind the point(s) on the cone z^2 = x^{2}+3y^{2} that are closest to the point (-1,-7,0)
*October 17, 2014*

**calculus**

A sample poll of 100 voters revealed the following information concerning three candidates A, B, and C who were running for three offices. 10 voted in favor of both A and B, 35 voted in favor of A or B but not C, 25 voted in favor of B but not A or C, 65 voted in favor of B or...
*October 17, 2014*

**physics**

A mass of 3.25 kg is attached to the end of a spring that is stretched 20 cm by a force of 14 N. It is set in motion with an initial position x_0 = 0 and initial velocity (in m/s) v_0 = -11. Find the amplitude, period, and frequency of the resulting motion. You should assume ...
*October 17, 2014*

**calculus**

Use Lagrange multipliers to find the maximum and minimum values of f(x,y)=x^2y+3y^2-y subject to the constraintx^2+y^2less than or equal to 10
*October 17, 2014*

**calculus**

Given g(x) = (x + cosx)/(e^x - 2x^3 + 5). Find g'(x). Do not need to simplify.
*October 17, 2014*

**calculus**

Find the point on the surface z = 2x2+xy+3y2 where the tangent plane is parallel to the plane 8x-8y-z=5.
*October 17, 2014*

**math**

Solve the initial value problem 3(y-1)^2 = y'', with y(0) = 3 and y'(0) = 4. Assume y does not equal 1.
*October 17, 2014*

**calculus**

f(x)= 3+4xe^{-5x}complete the sentences concerning the function a) the function f is decresing on the iterval...... b) the function f is increacing on the interval c) the function f is concave down on the interval d) the function f is concave up on the interva
*October 17, 2014*

**Algebra**

Given the following piecewise function: Find the Given the following piecewise function: f(x)= {?(x+10 for -9 ?x<-2@3 for -2 ?x ?0@2x-6 for 0<x ?5 )? Find the domain. Find the range. Find the intercepts. Is f continuous on its domain? If not, state where f is ...
*October 17, 2014*

**Algebra**

Describe how projections play a role in the least squares solution?
*October 17, 2014*

**math**

determine the number of zeros at the end of 50! using prime factorization
*October 16, 2014*

**algebra**

John read 1/4 of pages of book on Saturday and another 2/3 of pages on Sunday. She read the last 5 pages on Monday . What was the total pages of book?
*May 2, 2014*

**math**

fedrick ordered a new sign for her store. The sign has 4 sides . It also has 2 right angles. 1 acute angle , and 1 obtuse angle . What is the shape of the sign. 1. Hexagon 2. Trapezoid 3. rhombus 4. parallelogram
*April 10, 2014*

**math**

john ordered a new sign for her store. The sign has 4 sides . It also has 2 right angles. 1 acute angle , and 1 obtuse angle . What is the shape of the sign. 1. Hexagon 2. Trapezoid 3. rhombus 4. parallelogram
*April 10, 2014*

**MATH**

Ella ordered 16 pizzas for a p. After the party,, there were 3 5/8 pizzas left. How much pizza was eaten? solve the problem
*April 4, 2014*

**math**

The 6th grade classes have started a contest to collect cans for recycling. The first class to reach 500 cans will win. The chart below shows the two classes in the lead. How many cans does each class have left to meet their goal? show the work . find how much they collected. ...
*March 24, 2014*

**biology**

In chickens, males have two Z sex chromosomes (ZZ) and females have one Z and one W sex chromosome (ZW). The mechanism for inheritance of the sex chromosomes is exactly the same as for X and Y sex chromosomes in other species. In chickens the character of ‘barred’ or...
*March 19, 2014*

**Biology**

A poultry farmer hopes to profit from the current craze for keeping egg laying chickens as pets and wishes to increase his stock of interesting and unusual breeds. (a) The farmer crossed a pure-breeding white chicken with a pure-breeding black chicken and found that 100% of ...
*March 19, 2014*

**science**

What type of prac do you think you need to use a filter funnel and filter paper. please help quickly
*March 5, 2014*

**Computer Science**

The Daily Gazette accepts classified ads in several categories. For most ads, the newspaper charges 10 cents per word for the first 50 words, and 8 cents per word for every word after that. Design Visual Logic Flowchart for a program that accepts data about an ad: customer ...
*February 20, 2014*

**General Chemistry **

How do the vapour pressure of two substance at the same temperature but with different strengths of the inter-molecular forces compare. Give a molecular explanation of why this is so.
*February 5, 2014*

**Chem**

Qc is the reaction quotient. And also, how would i solve this: Calculate the equilibrium concentration of each compound if 0.310 moles of H2 and 0.310 moles of I2 are placed in a 4.30 liter container at 520°C. Kc = 0.190 for the reaction at this temperature.
*February 5, 2014*

**Chem**

Calculate the value of Qc for the reaction above if 2.30 moles of NO2, 1.50 moles of NO, and 1.20 moles of O2 are placed in a 3.50 liter container at 30°C. Kc = 0.440 at this temperature.
*February 5, 2014*

**Math**

Assume that the rate of population growth of ants is given by the equation: dP/dt=.1P(1 - P/730)-(129000/7300) a. If P(0)=150, what happens to P as t gets very large? b. If P(0)=800, what happens to P as t gets very large? c. If P(0)=800, what happens to dP/dt as t gets very ...
*December 11, 2013*

**Math**

∫[dy/(y^2-1)] How do i solve this?
*December 10, 2013*

**Calculus**

Solve the differential and initial value problem: x(dy/dx) + 1 = y^2 y(1)=0 I tried using bernoulli and it didn't quite work.
*December 10, 2013*

**Physics**

An ocean liner is traveling at 5m/s. A passenger on deck walks towards the rear of the ship at a rate of 4m/s. After walking 30 meters, he turns right and walks at a rate of 4m/s to the rail, which is 12 meters from his turning point. What is his velocity relative to the water...
*November 13, 2013*

**math**

Ram Dubey recently purchased a chain of dry cleaners in North Uttar Pradesh. Although the business is making a modest profit now, Ram suspects that if he invests in a new press, he could recognize a substantial increase in profits. The new press costs $ 15,400 to purchase and ...
*October 11, 2013*

**Chemistry 12**

The original 10 ml (KIO3) solution is 0.020M is mixed with 10 mL of 0.0020M NaHSO3 which give a total volume of 20 mL. Calculate the concentration of KIO3 in the final mixture of the dilution.
*October 2, 2013*

**English**

need complex sentence with cordinate& subordinate
*June 24, 2013*

**math**

An electric pole touches the ground due to bending in a wind. It is found that standing part of pole is equal to the distance of end touching the ground. If the end touching the ground from the pole is at distance 4 m, what was the length of pole before bending ?
*April 27, 2013*

**finance**

Fashion Distributors Incorporated currently sells on terms of 2/10, net 30, with bad debt losses at 1% of gross sales. Of the 99% of the customers that pay, 50% take the discount and pay on Day l0; the remaining 50% pay on Day 30 (average collection period of 20 days). FDI'...
*April 8, 2013*

**math**

for what value of k are the roots of the quadratic equation (k+4)x*x+(k+1)x+1=0?
*March 14, 2013*

**Algebra**

118
*March 4, 2013*

**physics**

The light from the sun is found to have a maximum intensity near the wave length of 470nm assuming the surface of the sun as a black body,the temperature of the sun is....
*February 28, 2013*

**physics**

You and a friend are going to a river, where they have a rope swing. Your friend, who has a mass of 60 kg, hops on the end of the rope. You tug horizontally on your friend with a force of 300 N, pulling them back until you can't move them any more. Then you let go and ...
*February 21, 2013*

**physics**

A cylindrical glass of radius r=3 cm is full of salt water of height h=10 cm with the water's refraction index changing linearly from the bottom n1=1.401 to the top n2=1.400. A flashlight is positioned so that light shines horizontally onto the glass. If we look at the ...
*February 21, 2013*

**physics**

Two protons and two positrons form a square as shown in the figure. All the particles are initially at rest. Due to Coulomb's repulsion, the particles fly off to infinity. Determine the ratio vp/ve where vp and ve are the final velocities of the protons and positrons, ...
*February 21, 2013*

**maths**

A man is visiting a village where each person either always tells the truth or always lies. There are 5 villagers standing in a row, and the man asks each of them how many of the 5 men standing in the row always tell the truth. Each villager gives an integer answer from 0 to 5...
*February 19, 2013*

**maths**

Find the number of triples of integers a<b<c with a≥−10, such that a(b−c)^3+b(c−a)^3+c(a−b)^3=0
*February 19, 2013*

**science**

A ski jumper launches from a ski jump that is oriented parallel to a hill. The jump has a vertical drop of 50 m and the coefficient of friction μ between the skier and the jump is 0.05. The launch point is 5 m above the hill and there is a small lip at the bottom of the ...
*February 17, 2013*

**green lawns**

With a chemical test differentiate between H2SO4 and H2SO3
*February 3, 2013*

**fianance**

can you check my answers if they are correct thank you 1.) A convertible bond is currently selling for $945. It is convertible into 15 shares of common which presently sell for $57 per share. What is the conversion premium? A. $90 B. $45 C. 57 shares D. 13 shares Answer c 2.) ...
*January 5, 2013*

**new India**

a number is greater than 3 but less than 8.Also,the number is greater than 6 but less than 10.What is the number?
*December 28, 2012*

**maths --plse help me..**

47.2506 = 40+7+.2+.05+.0006 COMPARING WE GET A= 10, D=1 C=.1 , D=100 , E= .0001
*December 22, 2012*

**math**

dicks had a 1 day sale. the original bike price was $325. on sale the same bike was $276.25. what is the percent reduction for this sale?? thxx
*December 11, 2012*

**Math**

A souvenir mug sells for 8 dollars. Kendra gives the clerk 9 dollars and recieves 56 cents. what is the sales tax rate? Thx!
*December 11, 2012*

**Algebra**

10 100 3
*December 5, 2012*

**statistics**

6.95 ± 1.96 (.352) =
*December 5, 2012*

**Human physiology**

find effective osmotic pressure of normal saline.
*September 25, 2012*

**AP Physics**

A hot air balloon containing an AP Physics student ascends vertically at a constant speed of 8 m/s. While ascending, he accidentally drops his rubber duckie from the gondola of the ballong. Seven seconds after it is dropped the duckie bounces off a roof at point A and hits the...
*September 15, 2012*

**physics**

to find the depth of the water surface in a well, a person drops a stone from the top of the well and simultaneously starts a stopwatch. The watch is stopped when the splash is heard, giving a reading of 3.65 s. The speed of sound is 340 m/s. Find the depth of the water ...
*September 12, 2012*

**Spanish writing**

Spanish writing - SraJMcGin, Saturday, August 18, 2012 at 8:49pm Just because the directions say to use the Subjunctive, it does NOT mean to use it everywhere! Your first statement is FACT and therefor there is no Subjunctive! hay muchas, etc. The 2nd sentence says what you DO...
*August 18, 2012*

**Spanish writing**

Thanks for your input! I have made corrections and can you please verify if I have followed the rules correctly? Thanks! En los Estados Unidos hay muchas cuestiones políticas. Creo que hay tres cuestiones principales. Los tres cuestiones principales son: el control de ...
*August 18, 2012*

**Spanish writing **

Could you please check the grammar of my writing assignment. Thank you very much! Discuss your opinions and ideas about three different popular political issues. Include how you think things should be and what you wish certain people would do about it. Articulate your ideas on...
*August 18, 2012*

**math**

a car travels around a horizontal circular track of radius 45m. if the car increases its speed at a constant rate of 1.2m/s starting from rest, determine the time needed for it to reach an acceleration of 1.4m/s. What is its speed at this instant?
*August 4, 2012*

**math**

write a short paragraph on rational nu mber
*July 3, 2012*

**Math**

Find the value of K such that the following trinomials can be factored over the integers: 1. 36x^2+18x+K 2. 3x^2 - 16x+K
*June 12, 2012*

**physics**

projectile motion with constant horizontal speed ? A stone falls off a cliff with horizontal velocity v m/s. it falls a distance of 5cm vertically and 200m horizontally in t seconds. when it has fallen a vertical distance of 20cm, what is its horizontal distance from the cliff...
*April 16, 2012*

**physics**

a ball is thrown at an angel of 40 degee above tghe horizontal.the ball clears the fence whis is 85 metre away.what is the inital velosity of the ball if we assume the ball is thrown at the same elevation of the fence
*March 10, 2012*

**algebra**

A man is 4 times as old as his son.After 16 years he will be only twice as old as his son. find their present ages.
*February 15, 2012*

**english**

Are you gonna help
*January 26, 2012*

**english**

cool he likes to play video games and do crazy stuff
*January 26, 2012*

**english**

are you going to reply
*January 26, 2012*

**english**

like what
*January 26, 2012*

**english**

no i want to do fake person
*January 26, 2012*

**english**

i need to write carecter sketch esay nedd help due 1/27/12 friday need help ASAP
*January 26, 2012*

**math**

is some one gona reply
*January 13, 2012*

**math **

Joel has twice as many CDs as Mariella has. Subtracting 7 from the number of CDs Joel has and dividing by 3 equals the number of CDs Blake has. If Blake has 25 CDs how many CDs does Mariella have? Help step by step
*January 13, 2012*

**Physics**

A worker pushing a 35.0-kg wooden crate at a constant speed for 13.7 m along a wood floor does 390 J of work applying a constant horizontal force of magnitude F0 on the crate.Determine the value for F0.
*November 21, 2011*

**Chemistry**

Calculate ∆H˚ for the following reaction using the given bond dissociation energies. CH4 (g) + 2O2 (g) --> CO2 (g) + 2H2O (g) Bond.......∆H˚ (kJ/mol) O-O........142 H-O.........459 C-H.........411 C=O........799 O=O........498 C-O.........358 ∆H...
*November 9, 2011*

**Math**

If a is the greatest common factor of 72 and 48, and if b is the greatest common factor of 108 and 144, what is the least common multiple of a and b
*October 28, 2011*

**calc**

Find all values of x for which the tangent line ot y=2x^3-x^2 is perpendicular to the line x +4y=10?
*October 23, 2011*

**math**

let θ(in radians) be an acute angle in a right triangle, and let x and y, respectively, be the lenghts of the sides adjacent and opposite θ. suppose also that both x and y vary with time how are dθ/dt, dx/dt, and dy/dt related?
*October 19, 2011*

**Algebra 2**

3 5 7 are odd and consecutive-- they add to 15 which is greater than 10 and less than 20.
*October 19, 2011*

**Calc**

let theta (in radians) be an acute angle in a right triangle, and let x and y, respectively, be the lenghts of the sides adjacent and opposite ?. suppose also that both x and y vary with time
*October 19, 2011*

**Algebra**

y- intercept is b in the formula y=mx+b hence your y intercept is 7/2.
*October 19, 2011*

**Algebra**

y=mx+b and m is the slope rearrange the equation so you can find what y equals. in this case you would rearrange it to equal y=-5x/2+7/2. so your slope is -5/2.
*October 19, 2011*

**Calculus**

Assume that x>0 and y>0. If y=5sqrt{x+9} and dx/dt = 2, find dy/dt when x=7.
*October 17, 2011*

**Algrebra**

Please advise on the following: From 1993 to 2003 the cumulative number N of AIDS cases in thousands can be approximated by, where corresponds to the year 1993. N = -2 x2 + 76x + 430, where x = 0 corresponds to. 1) Show how well the equation approximates the data. 2) Rewrite ...
*July 25, 2011*

**world issuse**

Don't kno the answe...pls tell me the answer
*May 24, 2011*

**math**

Probability: 11 out of 29; or 37.9310345%. Method: Take a sample of 100. 45 are men; 40% or 18 men wear glasses 55 are women; 20% or 11 women wear glasses. So out of 100, 18+11=29 wear glasses out of which 11 are women. Probability: 11 out of 29
*April 13, 2011*

**math**

-1/2, 1/7, 2/7, 6/7 Method: Negative (-1/2)is obviously smaller than positives. So that is the smallest. Then arrange the rest in order of the top (numerator), since the bottom (denominator) in each case is the same.
*April 13, 2011*

**algebra 1-B**

how to write 24th march 2011 in 5b letter without using number
*March 24, 2011*

**geometry**

A right triangle has a base that is 2 more than twice the height. Find the length of the base for the triangle. If the area is 30 square units.
*January 31, 2011*

**MATH !!**

could you also tell me what the series will be ? thanks.
*December 19, 2010*

**MATH !!**

n lim(n→+∞) ∑ (3/4)^k = k=1 the n is supposed to be above the sigma sign and the k=1 is supposed to be below the sigma sign. thanks.
*December 19, 2010*