Sunday

February 7, 2016
Total # Posts: 2,150

**pre-calculus**

Prove 3+4+5+...+(n+2) = [n(n+5)]/2 for n>4 Do the first step in a proof by induction.
*June 21, 2010*

**trig**

Write the following equation in standard form and identify the type of conic: 9y^2 - 4x^2 + 8x + 18y + 41 = 0
*June 14, 2010*

**math**

In November, a toy was $40.00. In Dec., the price increased by 80%. In Jan., the price decreased by 80%. What was the price of the toy after it was discounted in January?
*June 13, 2010*

**MATH**

Triangle XYZ below is an isosceles triangle with legs and . and are perpendicular bisectors of triangle XYZ. Find the length of segment if QR = Â½ x and QS = - Â½ x + 4.
*June 4, 2010*

**calculus**

I'm not sure how to find the limit of this problem :S limit as x -> 0+ (cos(x))^(1/x^2)
*May 31, 2010*

**CHEIMISTRY**

A buffer solution is 0.20 M in HPO42- ions and 0.l0 M in H2PO4- ions. What is the H3O+ ion concentration of the solution? The ionization constants for H3PO4 are as follows: Ka1 = 7.5 ´ 10 -3, Ka2 = 6.2 ´ 10-8, Ka3 = 1 ´ 10-12. a. 3.7 ´ 10-3 M b. 3.7 &...
*May 30, 2010*

**chemistry**

What is Ka for 4-aminobenzoic acid if a 0.020 M solution of the acid has a pH of 3.31? a. 2.5 ´ 10-2 b. 2.0 ´ 10-2 c. 4.9 ´ 10-4 d. 1.2 ´ 10-5 e. 2.8 ´ 10-6
*May 30, 2010*

**college**

arranged in a triangle with each building about 500 meters apart. Previously, these buildings were wired with CAT3 UTP running 10BaseT Ethernet. The IT director had mandated that your company will need to use 1000 Mbps Ethernet to the desktop. Define a comprehensive network ...
*May 28, 2010*

**Physics**

A 1.3 X 10^3 kg car traveling with a speed of 2.5 m/s executes a turn with a 7.5 m radius of curvature. Calculate the centripetal acceleration of the car and the centripetal force acting on the car.
*May 24, 2010*

**Physics**

Describe the primary force or forces involved when a car executes a turn. Explain why passengers tend to lean or slide toward the outside of the turn.
*May 24, 2010*

**Physics**

Centripetal force can be calculated from centripetal acceleration by?
*May 24, 2010*

**Physics**

A centripetal force acts
*May 24, 2010*

**Physics**

What term describes a force that causes an object to move in a circular path?
*May 24, 2010*

**Physics**

What is the centripetal acceleration of a skater moving with a tangential speed of 2.0 m/s in a circular path with radius 2.0 m?
*May 24, 2010*

**Physics**

What is the speed of an object in circular motion called?
*May 24, 2010*

**trigonometry**

in triangle abc, angle c is a right angle, AC=8,Bc=15 and AB=17 a.find Sine a b.Find cosine A c.Find Sine B d. Find COsine B E. the measure of angel A f. the measure of angela b Can u tell me the answers and how to do it. Because im in 8th grade
*May 18, 2010*

**trigonometry**

in triangle abc, m<c=90, bc=20, and ba=40. a.find sine a b.find measure of <a
*May 18, 2010*

**triginometry**

thanks
*May 18, 2010*

**triginometry**

In Triangle RST, m<S=90, RS=5, and ST=12. Find Cosine T
*May 18, 2010*

**Physics**

suppose the hammer has a mass of 7.26kg, the wire is 1.00m long, and the force keeping the hammer moving in a circle is 7.43 x 10^3N. what will the hammer's speed be when the thrower releases the wire?
*May 13, 2010*

**Physics**

what is magnitude of the centripetal if the tangential speed of the car is 2.0m/s and the radius of the wheel is 83m
*May 13, 2010*

**Chemistry**

1. c 2. a
*May 13, 2010*

**math**

how to slove (2y+5)(y-3)
*May 12, 2010*

**chemistry**

How many atoms of Ag are in each of the following quantities? 1- 0.38 mole Ag2S? 2- 0.78 mole AgCl?
*May 10, 2010*

**Chemistry**

What is the name of the product when cinnamaldehyde and cyclopentanone undergo aldo condensation?
*May 7, 2010*

**College Chemistry**

Sulfur trioxide is made from the reaction of sulfur dioxide and oxygen. how many grams of SO3 can be made from the reaction of 1.91g SO2 with 1.29g O2? 2 SO2(g) + O2(g)---> 2SO3(g) a) 2.39g b) 3.20g c) 3.23g d) 4.77g e) 6.46g How would i solve this problem?? Im thinking i ...
*May 4, 2010*

**social studies**

what tools did egyptians use to bulid pyramids
*May 3, 2010*

**Chemistry**

What precautions must be taken when you introduce the mixture of compounds to be separated onto the absorbent column
*May 2, 2010*

**College Chemistry**

Thanks, i had my doubts! I was also wondering how i can determine which ionic solid will have the least melting point. Do i look at the intermolecular forces, or do i need to look else where for my answer???
*April 29, 2010*

**College Chemistry**

Does Vapor Pressure decrease as intermolecular forces increase???
*April 29, 2010*

**Math**

You roll a number cube three times. Find P(all odd).
*April 28, 2010*

**College Chemistry**

I see. Well thanks DrBob222. Im starting to understand it a little more.
*April 27, 2010*

**College Chemistry**

BF3 can best be described through the lewis structure as? 1. It has less than an octet on at least one atom. or 2. It has less than an octet of electrons on all toms. I know that it is missing electrons in order to satisfy the octet. And Boron nor fluorine can make double ...
*April 27, 2010*

**Chemistry**

Hi Can someone please help me undersand how to get the answer to this question A 15.0 mL solution of 0.050 mol/L AgNO3 was titrated with 0.0250 mol/L NaBr in the cell SCE || titrated solution | Ag(s) Find the cell voltage for 10.0 mL of titrant added. (a) -0.0312 V (b) 0.194 V...
*April 26, 2010*

**math **

y=3x^2-7
*April 23, 2010*

**calculus**

Solve the equation. 2x - 4 = -10 Find the LCM of 29 and 116. Simplify. 88 · 8-8
*April 22, 2010*

**mat**

2 - x > 17
*April 22, 2010*

**computer programming c++**

c++ program questoin A particular talent competition has 5 judges, each of whom awards a score between 0 and 10 to each performer. Fractional scores, such as 8.3, are allowed. A performer’s final score is determined by dropping the highest and lowest score received, then ...
*April 21, 2010*

**chemistry**

Sulfur trioxide, SO3, is produced in enormous quantities each year for use in the synthesis of sulfuric acid. S(s) + O2(g) -> SO2(g) 2SO2(g) + O2(g) -> 2SO3(g) What volume of O2 (g) at 350 degrees Celsius and a pressure of 5.25 atm is needed to completely convert 5.00g ...
*April 17, 2010*

**4 grade math**

are you seriously in 4th grade and using this website for help? lol i'm a 3rd year college student and i just started to ask for help online
*April 15, 2010*

**math**

a series of numbers starts with 2.each number in the series is two times as great as the number before it.what is the sixth number in the series.
*April 15, 2010*

**US History**

How did the Missouri Compromise cause the North and South to have even stronger feelings of sectionalism in the United States?
*April 14, 2010*

**College Chemistry**

How do acids and bases react?
*April 14, 2010*

**US History**

What was the Gasden Purchase?
*April 14, 2010*

**CRT 205**

I AM HAVING TROUBLE WITH FINAL PROJECT ON GUN CONTROLL
*April 14, 2010*

**organic chemistry**

Lab was: PREPARATION OF A SYNTHETIC PLANT HORMONE
*April 14, 2010*

**PHYSICS PLS HELP**

Internal resistance problem. Suppose that in Figure 3.3, Vo=13V, R1=250kphm, R2=375kohm, and Ri=1.9Mohm. Initially, the voltmeter is disconnected. EXAMPLES: What is the voltage across R2? [Answer: 7.8 V.] What is the voltage across R2 with the meter connected? [Answer: 7....
*April 14, 2010*

**Physics**

With speed 75m/s and period 5.42ms, calculate the wavelength.
*April 9, 2010*

**chemistry**

what is the pressure exerted by a 0.500 mol sample of nitrogen in a 10.0 L container at 20 degrees C?
*April 8, 2010*

**chemistry**

once i have the amount of mols of sucrose present how do i convert that to sucrose? and to kj and grams? lets say i have 0.03110 mols of sucrose
*April 7, 2010*

**chemistry**

if 32kj of energy results in an average weight gain of 1 g of body mass, then how much weight could a person gain after eating 1 cookie. use dimensional analysis mass of 15.21g of a cookie.
*April 7, 2010*

**chemistry**

does not at all say. thats all that is provided. it just sais use dimensional analysis to solve this question. i have a 95% average in this class so far and iam completely puzzled. this is a bonus question on a lab.
*April 7, 2010*

**chemistry**

if 32kj of energy results in an average weight gain of 1 g of body mass, then how much weight could a person gain after eating 1 cookie. mass of 15.21g of a cookie.
*April 7, 2010*

**Algebra**

No worries, Thank you
*April 7, 2010*

**Algebra**

it's f to the power of -1, then i think it's called composite f. Like you know when you get the problems fog of gof? it's like that except fof and the first f is raise to -1 power. Thanks
*April 7, 2010*

**Algebra**

using f(x)=4x-5, find f^-1 o f
*April 7, 2010*

**Inorganic Chemistry**

In the molecular compound [Co(NH3)3(DMF)](NO3)3 what is the mode of bonding in which DMF is preferred?
*April 7, 2010*

**Inorganic Chemistry**

In the molecular compound [Co(NH3)3(DMF)](NO3)3 what is the mode in which DMF is preferred?
*April 7, 2010*

**College Chemistry**

Would i take the n into consideration?? This has to do with quantom numbers by the way.
*April 6, 2010*

**College Chemistry**

How many orbitals have the following quantum numbers: n=6, l=2, ml=-2?? a. 0, b. 5, c. 7, d. 10, e.6 Since only one can include n=6 in its equation would it make it just one orbital having those numbers? im also thinking that there might be other orbitals that have these ...
*April 6, 2010*

**XECO 212**

I would for you to point me in the direction.
*April 6, 2010*

**Business**

How did U.S. manufacturers become vulnerable to offshore outsourcing? What are some of the operations management practices that can help bring manufacturing back to the U.S? How can a focus on quality improve manufacturing? How can lean manufacturing and near-sourcing help a ...
*April 5, 2010*

**physics**

how do i solve this, i tried dividing the mass by the height, but its wrong A 407-kg pile driver is raised 15 m above ground. (a) How much work must be done to raise the pile driver?__kj (b) How much work does gravity do on the driver as it is raised?__kj (c) The driver is now...
*April 4, 2010*

**College Chemistry**

Thank you i appreciate it.
*March 30, 2010*

**College Chemistry**

Part a: What mass of solid CuCL2 is required to prepare 450.0mL of 0.125M CuCl2 solution?? Part B: What are the concentrations of Cu +2 ions and Cl- ions in the above solutions. I understand part a, and got the right answer. i need help understanding part b.
*March 30, 2010*

**calc-kinematics**

if a particle moves along a line so that at time t where t [0,pi] its position is given by s(t)=-4cost-t^2/2+10 what is the velocity of the particle when its acceleration is zero? so i found v(t) = 4sint-t a(t)=4cost-1 = 0 solved for t plugged it into v(t) and i got the wrong ...
*March 30, 2010*

**calc-related rates**

"The volume of a cone of radius r and height h is given by V=1/2(pi)(r^2)(h)If the radius and the height both increase at a constant rate of .5 cm per second at WHAT RATE in cubic cm per second, is the volume increasing when the height is 9 cm and the radus is 6 cm" ...
*March 30, 2010*

**Chemistry**

When solving using the quadratic equation, I get two possible values. Which one do I use? Both are positive.
*March 29, 2010*

**Chemistry**

What is the pH of a 0.0054 molar solution of Oxalic Acid. K1= 6.5E-2, K2= 6.1E-5? Here's what I have so far for K1: 6.5E-2 = (x)(x)/ (x-0.0054) x= 0.0059 pH = -log(0.0059) = 2.23 K2 is pretty much the same, but I have to work it out. 6.1E-5 = (x)(x + 0.0059)/ (x-0.0059) x...
*March 29, 2010*

**calc**

how to find the integral of this function x^2 * root(x^3+1)
*March 28, 2010*

**calc**

how do i find the derivative of........ (sinx) ^2-(cosx) ^2 i put it into my t-89 and got -4sinxcosx butthats not a multiple choice. can someone tel me how to do this by hand?
*March 28, 2010*

**chemistry**

Choose all of the following statements about the equilibrium constant K that are true: (a) If the K value for a reaction is > 1 then Go must be negative for this reaction (b) A large value for K implies there is a strong driver for the reaction to proceed in the forward ...
*March 28, 2010*

**Math**

What is 563 divided by 4 show you work
*March 25, 2010*

**grammar**

preschool ivite pablo on thursdays.
*March 25, 2010*

**Chemistry**

I'm not real sure about the K1 expressions. Is this correct? C2H2O4 --> H+ + C2O4H- K1 = (x + 0.0054)(x + 0.0054)/ (0.0054-x) Solve for x then repeat for K2
*March 24, 2010*

**Chemistry**

What is the pH of a 0.0054 molal solution of C2H2O4. First ionization constant K1= 6.5 x 10-2, second K2= 6.1 x 10-5.
*March 24, 2010*

**Chemistry**

Is the answer 0.211 mg/L PbF2?
*March 24, 2010*

**Chemistry**

If PbF2 is poured into a solution of 0.012 molar F-, how much will dissolve at equilibrium?
*March 24, 2010*

**physics**

wait but kqq/r2 is the equation for a force not an energy
*March 23, 2010*

**physics**

An alpha particle approaches a uranium nucleus as 1e6 m/s what is the closest this particle will get to the nucleus how do you set this problem up? thanks!
*March 23, 2010*

**Chemistry**

when dissolved in an aqeous solution, which of the following salts will yield an acidic solution? NH4Cl, NaClO4, Na2S, MgBr2, Ba(CH3CO2)2
*March 22, 2010*

**English**

I have no idea, I cannot think clearly at all today. I wouldn't even know where to start, even though I know what an analogy is.
*March 20, 2010*

**PHYSICS PLEASE HELP!**

Suppose an electron is released from rest in a uniform electric field whose magnitude is 4.70 103 N/C. (a)How much work is done by the field in moving the electron through a distance of 7 cm? J (b) Through what potential difference will it have passed after moving through this...
*March 17, 2010*

**PHYSICS PLEASE HELP!**

(a)How much work is done by the field in moving the electron through a distance of 7 cm? J (b) Through what potential difference will it have passed after moving through this distance? V (c) How fast will the electron be moving after it has traveled this distance? m/s
*March 17, 2010*

**chemistry**

Thank you!
*March 16, 2010*

**chemistry**

So how would I put AgNO3 in the equation? That part kind of confuses me.
*March 16, 2010*

**chemistry**

The traditional method of analyzing the amount of chloride ion present in a sample was to dissolve the sample in water and then slowly add a solution of silver nitrate. Silver chloride is very insoluble in water, and by adding a slight excess of silver nitrate, it is possible ...
*March 16, 2010*

**Chemistry**

There was a typo on the problem. and cobalt was never meant to be used. It should have read copper which went along with previous questions. Hence, everyone's confusion. Thanks
*March 16, 2010*

**Chemistry**

Determine the moles of ammonia in the following cobalt ammine complex: A sample of .1500 g of the cobalt ammine complex is places in a flask and 25.00mL of .200M HCL is added. a few drops of bromocresol green is added and the titration with .100M to NaOH required 16.42mL. I ...
*March 16, 2010*

**7th grade**

Transmission
*March 15, 2010*

**college Psychology**

I am having trouble describing the interaction (How does effect of one Independent variable depend on level of other independent variable and why?) My 1st independent variable is Type of Stimulus: with 2 levels pictures and words. My 2nd independent variable is Type of Content...
*March 14, 2010*

**Accounting**

a 10 year zero coupon bond that yield 5% is issued with a 1000 par value. w hat is the issuance price of the bond
*March 8, 2010*

**french**

how would you say a 'model village'?
*March 7, 2010*

**french**

how would you say 'a minster' not a minister
*March 7, 2010*

**french**

thankyou
*March 7, 2010*

**french**

how would you say 'it's a market town'?
*March 7, 2010*

**Investments Analysis**

Can anyone help with ANY of these? Any good starting points would be great! Alpha (STI) 0.90 2008 Return(STI) 15% Beta(STI) 1.20 2008 Return(INX) 10% R_squared 36% Risk Free Rate 4% Variance(STI) .1296 b. What is the relative volatility (variability) of STI returns to INX ...
*March 6, 2010*

**arithmetic**

what is 11/4,4/7 and 10/21 in the simplest form i tried adding divide not coming with the right answer
*March 3, 2010*

**math**

how to simplify 15/60 in a fraction
*March 3, 2010*