Sunday

August 2, 2015

August 2, 2015

Total # Posts: 288

**math problems**

shelia works at Bills Bargin. She earns $350 per week plus 10% of all sales. What is her commission for the week, if she sold $2490 worth of goods?
*August 2, 2015*

**chemistry**

The edge length of face centered unit cubic cell is 508pm.if the radius of the cation is 110 pm,the radius of anion is
*July 7, 2015*

**history**

the reign of terror was a necessary evil discuss
*June 22, 2015*

**chemistry**

CHEMICAL KINETICS The rate of reaction 2N₂O5->4NO₂+O₂ can be written in three ways -d[N₂O5]/dt= k[N₂O5] d[NO₂]/dt= k'[N₂O5] d[O₂]/dt =k"[N₂O5] The relationship between k and k' and between k and k" are ?
*May 28, 2015*

**MATH**

0.4771=x/2.303*8.14[50/323*373 calc.-x?
*May 28, 2015*

**maths**

0.4771=x/2.303*8.14[50/323*373 calc.-x?
*May 28, 2015*

**chemistry**

In a zero order reaction ,20% of the reaction complete in 10s .How much time it will take to complete 50% of the reaction?
*May 27, 2015*

**chemistry**

A|A+3(0.1)||B+2(0.01m)|B GIVEN E°A|A+3=0.75v E°B|B+2=0.45v
*May 27, 2015*

**Chemistry**

Hydrazene can be used in fuel cell N2H4(aq)+o2(g)->N2(g)+2H2O(l) IfΔG°for this reaction is -600kj what will be the E°for the cell?
*May 27, 2015*

**Physics Help Please --- Telescope**

a) fe+fo 114 cm + 17 cm = 131 cm b) M=fo/fe 114 cm / 17 cm = 6.71 cm c) Need help with this part. Thank you!
*May 2, 2015*

**Physics Help Please --- Telescope **

An astronomical refracting telescope is made from two lenses. the objective lens has a focal length of 114 cm, and the eyepiece lens has a focal length of 17 cm. a) What is the total length of the telescope? b) What is the angular magnification of the telescope? c) What is the...
*May 2, 2015*

**Physics Help Please --- Urgent**

A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an insect is now placed 16 cm from this lens, how far FROM THE INSECT will its image be formed? A) 64 cm B) 72 cm C) 32 cm D) 96 cm E) 48 cm
*May 2, 2015*

**PHYSICS**

An object of mass M is divided into two parts ,which are placed at distance d.if gravitational force of attraction is maximum between parts,then find the ratio of mass of both parts
*April 3, 2015*

**Chemistry**

the rate of diffusion of a gas having molecular weight just double of hydrogen gas is 30 ml/s.the rate of diffusion of hydrogen gas will be
*April 2, 2015*

**CHEMISTRY**

Two gases A and B having the same volume diffuse through a porous in 20 and 10 seconds respectively .The molecular mass of A is 49u.Molecular mass of B will be
*March 23, 2015*

**Chemistry**

0.24g of a volatile substance,upon vaporisation,gives 45ml vapour at NTP what will be the vapour density of the substance?
*March 22, 2015*

**CHEMISTRY**

The average kinetic energy of an ideal gas,per molecule in S.I units at 25°C will be
*March 22, 2015*

**CHEMISTRY**

At 25°C and 730 mm pressure,380 ml of dry oxygen was collected.If the temperature is constant ,what volume will the oxygen occupy at 760 mm pressure ? ANSWER- 365ml
*March 22, 2015*

**CHEMISTRY**

The pressure exerted by 6.0g of methane gas in a 0.03m3 vessel at 129degreeC is.
*March 22, 2015*

**CHEMISTRY**

A gaseous mixture was prepared by taking equal mole of CO and N2 .if the total pressure of the mixture was found 1 atmosphere ,the partial pressure of nitrogen (N2) in the mixture is.
*March 22, 2015*

**Pre-calculus**

i wanna answer this inequality of this graph f(x)= x -3 if x >= 3
*February 13, 2015*

**math**

The scale of the map is missing.The actual distance from Liberty to West Quall is 72 miles,and it is 6 inches on the map. (A)What is the scale of the map? (B)Foston is between Liberty and West Quall and is 4 inches from Liberty on the map.How far is Foston from West Quall?
*January 15, 2015*

**AP Physics**

A block of mass 80.4 kg is sliding on a ramp. The angle of elevation of the ramp is 45 degrees. The coefficient of friction is 0.43. Use g=9.8. Give your answer to at least 2 decimal places. Assume that down the ramp is the positive direction.
*November 25, 2014*

**Physics Help Urgent **

A ball is thrown straight up into the air with a velocity of 12 m/s. Draw a motion diagram for the ball and then give as much quantities information as you can about the motion. I know you guys can draw anything on this platform. But can you lead me to answer by giving ...
*September 14, 2014*

**Organic-Chem Help**

You wish to purify by distillation a material that has a boiling point of 205 C and reacts with air but this material will decompose if heated above 150 C. How would you set up the system to distill this material? Show steps Pleaseeeee!!!!!!!!!! Thank you!!!!
*September 12, 2014*

**Life sciences**

tp be protected frpm any damged environmental influences
*July 31, 2014*

**American national government **

In brown v board of education Yvette supreme court overturned purest v Ferguson because it concluded that
*July 3, 2014*

**computers**

Th e No Interest Credit Company provides zero-interest loans to customers. Design an application that gets customer account data, including an account number, customer name, and balance due. Output the account number and name, then output the customer’s projected balance ...
*June 8, 2014*

**calculus help**

I need someone to show me steps. I used wolframalpha and got 40 but dont know how to solve this Thanks!!!
*May 8, 2014*

**calculus help**

Evaluate!!!! integral -10 to 10 ((2e^x)/(sinhx+coshx))dx Thanks!
*May 8, 2014*

**Calculus Help Please Urgent!!!**

When i put this answer in it is marked wrong. Are u sure this is the right answer for this question? Thanks!
*May 1, 2014*

**Calculus Help Please Urgent!!!**

Breathing is cyclic and a full respiratory cycle from the beginning of inhalation to the end of exhalation takes about 3 s. The maximum rate of air flow into the lungs is about 0.3 L/s. This explains, in part, why the function f(t) = (3/10)sin(2πt/3) has often been used ...
*May 1, 2014*

**CALCULUS **

A plane, flying horizontally at an altitude of 1 km and a speed of 500 km/hr, passes directly over a radar station. find the rate in km/hr at which the distance from the plane to the station is changing when it is 2 km away from the radar station. Hint: this is not a max/min ...
*April 24, 2014*

**Calculus**

x = -1 to x = 2
*April 23, 2014*

**Calculus **

a) Estimate the area under the graph of f(x)=7+4x^2 from x=-1 to x=2 using three rectangles and right endpoints. R3= ???? Then improve your estimate by using six rectangles. R6= ????? Sketch the curve and the approximating rectangles for R3. Sketch the curve and the ...
*April 23, 2014*

**CHEMISTRY HELP !!!! **

NH4CL , ZNCL2 , KAL(SO4)2 FIND THE FOLLOWING NET IONIC EQUATION FOR HYDROLYSIS EXPRESSION FOR EQUILIBRIUM CONSTANT (KA OR KB) VALUE THANK YOU SO MUCH!!!
*April 10, 2014*

**Calculus Help Please!!!**

Find the equation in slope intercept form of the tangent line and the normal line to the curve x^2+4xy+y^2=13 at the point.(2,1). show steps please!!! thank you!
*April 8, 2014*

**Calculus Help Please!!!**

I've got dy/dx= x^2/y^2 but couldn't find second derivative. thanks!
*April 8, 2014*

**Calculus Help Please!!!**

If x^3 - y^3 =3 , use only implicit diff. to find d^2y/dx^2 . Express your answer in terms of x and y only and write is as a proper fraction that is completely simplified as much as possible.
*April 8, 2014*

**Calculus Help Please!!!**

Thank you so much!!!
*April 4, 2014*

**Calculus Help Please!!!**

Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answers to three decimal places.) ln(1 + x) ≈ x Y1= I ln(1+x)-x I Y2= 0.1 ...
*April 4, 2014*

**Calculus Help Please!!!**

Find the absolute maximum and absolute minimum values of f on the given interval. f(t) = (t square root of (64 − t^2)) ,[−1,8]
*April 1, 2014*

**math**

Sorry. I think I was reading too fast and missed that. Thank you.
*March 31, 2014*

**math**

I need to convert this correct. I think that's my biggest issue. Since the diameter is in inches and the distance is in miles, wouldn't I have to convert the miles into inches?
*March 31, 2014*

**math**

Dana rode her bicycle 600 miles one summer before she had to replace the tire on her front wheel. The diameter of the front wheel is 24 inches. What is the best estimate of the number of revolutions made by the tire before it had to be replaced?
*March 31, 2014*

**Calculus Help Please!!!**

In a murder investigation, the temperature of the corpse was 32.5 C at 1:30pm and 30.3 C an hour later. Normal body temperature is 37.0 C and the temperature of the surrounding was 20.0 C. When did the murder take place? PLEASE SHOW STEP BY STEP
*March 27, 2014*

**math**

A water heater has a diameter of 18 inches. It sits in a drain pan that has a diameter of 22 inches and a height of 2 inches, as modeled in the diagram below. Water that leaks out of the water heater sits in the drain pan. Which of the following is closest to the maximum ...
*March 19, 2014*

**Calculus Help and Check **

Find dy/dx by implicit differentiation. x^5(x + y) = y^2(9x − y) this is what i've got so far but I dont think it is the right answer. y'= 9y^2-6x^5-5x^3y/x^5+9y^2-18xy
*March 14, 2014*

**Science**

Intrinsic control of heartbeat rate involves what mechanism(s)? a) The AV node initiates heartbeat although the SA node can generate a slower beat rate. b) The atrioventricular bundle initiates signals that travel to the Purkinje fibers. c) The SA node initiates heartbeat ...
*February 4, 2014*

**Physics **

Two spheres with masses of 5.00 g and 10. kg respectively are .500 m apart. calculate the force of attraction between them.
*January 22, 2014*

**Medical Billing and Coding**

Had to develop a paragraph using clear, varied sentences containing concrete words and transitions or connectives to create a logical flow. Need assistance in the following paragraph that describes on particular experience I had that inspired you or guided you to chose that ...
*December 10, 2013*

**Math**

(2-4i)-(-4+i)=
*November 10, 2013*

**finance**

can someone help me with this problem for this problem you will use 0.02/365 for your interest. You deposit $1000 at 2% for 20 years, compounded daily.
*September 17, 2013*

**finance**

You deposit $1000 at 2% for 20 years, compounded annually. What's the future value?
*September 16, 2013*

**finance**

You deposit $1000 at 2% for 20 years, compounded annually. What's the future value?
*September 16, 2013*

**math**

i am a 2 digit decimal , the sum of my digit is 12. if you divide me by a certain number the quotient is 37. who am i?
*August 13, 2013*

**pre cal **

Solve G(x) for the given domain. G(x) = 3x 2 - 2x - 1 G(6) =
*June 19, 2013*

**Physics**

Which of the following is the correct relationship between the electric field strength and the potential difference?
*May 31, 2013*

**Algebra**

Solve for x. Round to the nearest hundredth. ln(x) = -1.8 x =
*May 3, 2013*

**math**

Find the general solution of cos2x + 3 sin x =2
*May 3, 2013*

**math**

show that 1-sin x/cosx + cosx/1-sin x = 2 sec x
*May 3, 2013*

**,math**

show that sec theta(cosec theta) - cot theta = tan theta
*May 3, 2013*

**Algebra**

Write the logarithm in expanded form. log2(y^5)
*May 3, 2013*

**Algebra**

Solve for x. Round to the nearest hundredth. ln x = − 4/9 x =
*May 3, 2013*

**Algebra**

Evaluate the following function at the indicated values. H(x) = 2x (a) H(-3) = (b) H(0) = (c) H(5) =
*May 2, 2013*

**Algebra**

Given f(x)=x^2 + x + 4 and h(x)= 3x +2, evaluate the composite function. f [h(x)]
*May 1, 2013*

**Algebra**

Given h(x)= 2x + 2 and f(x)=1/2 x + 4, evaluate the composite function. h[f(x)]
*May 1, 2013*

**Algebra**

Given f(x) = 2x − 1 and g(x) = 4x − 4, evaluate the composite function. g[f(x)]
*May 1, 2013*

**Algebra**

Given f(x)=2x^2 + 9x − 7and g(x)=2x −6, find the following. (If an answer is undefined, enter UNDEFINED.) f(−2) − g(−2)
*May 1, 2013*

**Algebra**

Given f(x)= 2x^2 – 1 and g(x) = –2x + 1, find the following. f(3) − g(3)
*May 1, 2013*

**English Composition**

I know that mood and tone are different, but is mood considered an element of literature?
*April 17, 2013*

**chemistry**

how much heat is required to vaporize 343g of liquid ethanol at its boiling point?
*March 25, 2013*

**science**

In the laboratory small zircon crystals were separated from granite (K). Isotopic analysis of these zircon crystals gives a 207Pb/235U ratio of 0.45. the half-life of 235U (7.04 × 108 years), estimate the age of the granite in Ma to two significant figures
*March 10, 2013*

**Chemistry**

You are using concentrated hydrochloric acid solution (12.0 M)to make 445.0 ml of a 5.85 M solution. Calculate the number of milliliters of concentrated HCl required to make the solution.
*March 7, 2013*

**math**

Correct the right hand side of the following expressions. 5+ x = 5 + X 2 6 2 + 6 6x + 5 = x + 5 6 1 1 1 y + c = y + c
*February 20, 2013*

**Math**

Jake ate seven times more jelly beans as Sam. Together they ate 128 jelly beans. How many jelly beans did each person eat?
*February 11, 2013*

**Finance**

An investment pays 9 percent interest compounded semi-annually. What is the effective annual interest rate?
*January 31, 2013*

**cccs**

f/-11 < 9
*January 14, 2013*

**physics**

an elevator motor provides 45 W of power while lifting a 2000 kg elevator 35 m. if the elevator contains six passengers of the same mass and it takes 20.0 to accomplish this task, determine pass of each passenger.
*January 12, 2013*

**american government**

Which of the following is characteristic of a capitalist economic system? a. free enterprise b.self-reliance c.private property d.individualism e.all of the answers are correct
*December 30, 2012*

**language arts**

“In the snow” is repeated three times in “Scott’s Goodbye.” What meaning might the writer have hoped to convey by repeating this phrase?
*December 17, 2012*

**Calculus!**

A 16 ft. ladder leans against a wall, with the top being 12 ft. from the wall when time t=0. The top is sliding down at a constant rate of 4 ft./second. Given that the top of the ladder touches the ground at 3 seconds, what is the velocity of the bottom of the ladder when t=3?
*November 23, 2012*

**MATH,statistics**

At a recent scotch-tasting party, 20 faculty members and their (opposite sex) spouses were guzzling it back pretty well. One person quite correctly noticed that the women seemed to be drinking more than the men. If the mean number of drinks had by the men was 5, and that for ...
*November 2, 2012*

**statistics**

If other factors are held constant, how does increasing the number of scores in each sample affect the value of the independent measures t statistic and the likelihood of rejecting the null hypothesis?
*October 21, 2012*

**Physics**

if you were on a 22.7 degree slope and an avalanche started 425 m up the slope, how much time would you have to get out of the way, there is no friction.
*October 15, 2012*

**physics**

A box of books weighing 324 N is shoved across the floor by a force of 527 N exerted downward at an angle of 35 below the hori- zontal. The acceleration of gravity is 9.81 m/s2 . If μk between the box and the floor is 0.59, how long does it take to move the box 4.35 ...
*October 15, 2012*

**Math,statistics**

The sum of 16 reciprocals (1 over the number) is found to equal 4. What is the harmonic mean of the original (i.e., non-reciprocated) scores?
*October 9, 2012*

**Math,statistics**

The sum of 16 reciprocals (1 over the number) is found to equal 4. What is the harmonic mean of the original (i.e., non-reciprocated) scores?
*October 9, 2012*

**Physics**

On a playground slide, a child has potential energy that decreases by 1000 \rm J while her kinetic energy increases by 900 \rm J. What other form of energy is involved, and how much?
*September 28, 2012*

**Math**

The perimeter of a square is f feet. How long in yards is each side of the square?
*September 26, 2012*

**Math**

A number that can be divided by 2 three times in a row with no remainder, has 5 as a factor and is greater than 40
*September 25, 2012*

**Psychology**

Where are selfish impulses? Examples of social conscience?
*September 13, 2012*

**physics**

In the design of a supermarket, there are to be several ramps connecting different parts of the store. Customers will have to push grocery carts up the ramps. A grocery cart has a mass of 30kg. The coefficient of friction is .10. Assume that the shoppers will push the cart ...
*September 11, 2012*

**Math**

x is to 6 as 0.8 is to 1.5 How do I write a proportion with that? (proportion such as eg. 14/105=x/315) is it x/6=0.8/1.5 or is it x/0.8=6/1.5 Urgent!!
*September 11, 2012*

**7th G-Math**

a is the answer -9/-3 is 3 any negative divided by another negative is always a positive the -9+(-3) so it is -9-3 -9-3=-12
*September 11, 2012*

**math**

the value is 46 any thing in side the absolute values sign (| |) turns postive
*September 10, 2012*

**math**

y – (–19) = 25 negative and negative is positive y+19=25 now you want to get y all alone and anything flipped to the other side of the equals sign changes. so positive numbers turn negative as negative turn positive y=25-19 y=6 thats your answer!
*September 10, 2012*

**5th grade math**

0.33 is more. The less numbers a decimal has the more it is and then and the smaller the decimal, the larger.
*September 4, 2012*

**6th grade math**

13/16-1/4 you need to change 4 into 16. 4*4 is 16 so now it is 13/16-4/16 13-4=9 so it is 9/16
*September 4, 2012*

**statistics**

Breast feeding sometimes results in a temporary loss of bone mass as calcium is depleted in the mother's body to provide for milk production. An investigation gave the following data on total body bone mineral content (g) for a sample of mothers both during breast feeding...
*June 28, 2012*