# Posts by kelly

Total # Posts: 1,761

**Calculus**

find f'(a) for f(x)=1/sqrt(13-7x) i got my answer to be 7 / (7(13-7x)sqrt(13-7x)) but it says i am wrong please help

**Calculus**

find f'(a) for f(x)=1/sqrt(13-7x) i got my answer to be 7 / (7(13-7x)sqrt(13-7x)) but it says i am wrong please help

**physics**

An electron travels 3.75 m in 6.41 × 10−8 s. How fast does it travel? Answer in units of cm/s

**English 101**

What are some interesting topic regarding Pop Culture. Any ideas for my research paper.

**physics**

A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50. What is the magnitude of the frictional force that acts on the block

**4th grade math help!**

Melvin estimated 645 + 322 by adding 600 + 300. Is his estimated sum an over or under estimate? Ty

**Math**

Melvin estimate 645 + 322 by adding 600 + 300. Is his estimate sum an over or under estimate please? Ty

**Math**

i need help with my math

**bio 12**

you have an orginal populatonof eagles, then humans introduce new eagles in the same area. the new eagles reduce the amountof resources in its home range. what type ofdistrubtion would give the most accuarte assesment of sustainable maximum popualtion. the three type of ...

**physics**

Find the density in g/cm3 of a 120 cm3 piece of metal having a mass of 2 kg.

**chemistry**

Find the concentration of Cu+ in equilibrium with CuBr(s) and 0.10 M Br-.

**grammar**

i need help making sure my daughters paragraph is puntuated correctly

**math**

Hello, Please help with the below question. write three numbers that are greater than 1,543,000 and less than 1,544,000 Thanks!

**physics**

given that the total mass of the plasric cup,heater and thermometer is 350g, determine the heat capacity of liquid x. hetaer heater the liquid with 20W.

**english**

Is this a run on or complete sentence? The desert is very hot during the day, the temperature in the desert may drop below freezing at night.

**chemistry**

a 100.00 mL sample of water has an initial temperature of 20.0 degrees C. The water is heated, and after 5 minutes its temperature is 50 degrees C. approximately how much energy was absorbed by the water? (the specific heat of wter is 4.18 J/g. degrees C

**Math 116**

Justin had $49 before spending n dollars on Jeans. How much money remains? Translate to an algebraic expression

**Calculus**

sif xyz=0 (-3x^2yz)^3 p=27x^7y^4z^6 then p=?

**math**

If all of the following operations are present in math calculation which of them should always be done first??

**single variable calculus - indefinite integrals**

Oh! I didn't realize it was so simple. Thank you!

**single variable calculus - indefinite integrals**

integral of (1-(sinx)^2))/(cosx)dx i don't know what to make my "u" for u-substitution

**Single Variable Calculus**

sorry, I typed the answer wrong. Can you please check this answer? lim as x-> infinity of sigma from i=2 to n of ((2+3i/n^2+(2+3i/n))(3/n)

**Single Variable Calculus**

find an expression for the area under the graph of f(x)= (x^2)+x from x=2 to x=5 as a limit of a riemann sum (do not need to evaluate). the answer i got was: lim as x-> infinity of sigma from i=2 to n of (2+3i/n)^2+(3i/n)(3/n) is this correct?

**business**

Could you please help me re write the sentences below. Media convergence is the merging of mass communications outlets such as television, radio and the Internet along with portable and interactive technologies though various digital presentation platforms. Media convergence ...

**Business**

I could not find her other post. I did read it aloud and to me it sounds good, but that is probably because I have read it over and over again for an hour.

**Business**

Could you please help me re word my paragrah? It needs to be at least 100 words. Media convergence is the merging of mass communications outlets such as television, radio and the Internet along with portable and interactive technologies though various digital presentation ...

**Media**

Could you please help me re word my paragrah? It needs to be at least 100 words. Media convergence is the merging of mass communications outlets such as television, radio and the Internet along with portable and interactive technologies though various digital presentation ...

**HUM**

Could you please help me re word my paragrah? It needs to be at least 100 words. Media convergence is the merging of mass communications outlets such as television, radio and the Internet along with portable and interactive technologies though various digital presentation ...

**HUM**

I did not understand this part of my class so here is the question What is media convergence? Provide an example of media convergence and explain the media elements that are being combined. Explain how the combination of media elements in your example may be useful and to whom...

**HUM**

Could you please help me re word this paragraph. I need it to be at least 100 words, but this one that I did was not good enough. Social media sites have affected commerce because people can advertise to thousands of people all at once through different sites. Social media ...

**HUM**

I have done all of this and the above paragraph is what I came up with, but to me it still does not look right. This is my own work and I have already sent it through plagiarism and it came back with 3%. Now I am needing someone's help.

**HUM**

Can you help me re do this paragraph that I did. I keep looking over it an am not happy but can not think of anyway to change it. Convergence in the context of media refers to the technology driven unification of different media channels. Media convergence allows mass media ...

**HUM**

COuld you please help me re word this sentence- Social media sites have affected commerce because people can advertise to thousands of people all at once through different sites.

**math**

How do you simplify 4w(9)? would it be 36w?

**algebra**

can somebody help me out? am I doing this right? using the elimination method. y = 3x + 2 2y-6x=4 We have the solution for y so we use this to solve 2 (3x + 2) – 6x = 4 6x + 4 – 6x = 4 0x +4 = 4 Subtract 4 from both sides X=0 Now we use 0 for the x value in equation ...

**physics**

An extreme skier, starting from rest, coasts down a mountain slope that makes an angle 25.0° with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.200. She coasts for a distance of 13.8 m before coming to the edge of a cliff. Without ...

**Chemistry**

What volume of liquid water is produced from the combustion of 10.00 L of octane, C8H18? (density of octane=0.692 g/mL

**algebra**

In 1920 the record for a certain race was 46.5 seconds. in 1980 it was 45.3 seconds let R(t) = the record in the race and t=the number of years since 1920 R(t) = 46.5 - t*0.02 what is the predicted record in 2003? 44.84 what is the predicted record in 2006?44.78 what year will...

**us history**

what were some tension over slavery in the 1840's?

**algebra**

Please help me find the domain for the following functions. If I understand this correctly I can use any number as long as the denominator does not equal zero 1) y = 7/(1 +x) can be any number except -1 2) y = -2/(6- x) can be any number except -6 3) y = 8/(2x - 1)can be any ...

**algebra**

Please help f(x) = 3x² + 2 x= 3 my question, do I start by solving x² first then multiply by 3 and adding 2 f(3= 3 * 9 + 2 = 29 or do I multiply first 3*3 =9² +2 = 83 I'm pretty sure we resolve the exponents first but need some help

**algebra**

Damon, thanks for your help, sorry the ">"is a typo on my part. the quation is y = 3x +5 Again that you for your help

**algebra**

Y= 3x+5> Is this equation a function? I believe it is but I am confused, My understanding of functions is that regardless of what number I use for x, as long as I get one answer for y it is a function

**Com**

Ok thank you. I was just wanting a "second eye" to look over it.

**Com**

Is there a way to submit an essay for review without someone being able to copy it??

**chemisry**

If you have 32g of NH3 how many moles of NH3 is that?

**statistics**

IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual is randomly chosen. Let X = IQ of an individual. The middle 30% of IQs fall between what two values?

**physics**

A golfer takes three putts to get her ball into the hole once she is on the green. Her first putt displaces the ball 71.0 ft north; the second, 6.0 ft, 45 degrees south of east; and the third, 3.0 ft, 45 degrees south of west. What is the magnitude of the displacement (in feet...

**pre calculous**

solve each equation algebraically and check it by substituing into the orignall equation. 50e^0.035x=200 3LN(x-3)+4=5 Method of your choice by solving. logx^2=6 Logx^4=2 2x-2^-x/2=4 e^x+e^-x/2=4 500/1+25e^.3x=200

**History**

Well this site is no help. Thanks, found a better one!

**History**

What do you think is the most significant thing to learn about the differences between social, political and economic systems in the world?

**8th grade math**

A 20 ounce bag of popcorn costs $2.80 at the movie theater, if the unit price remains the same, how much would a 35 ounce bag cost ? Please help me, I'm in math class and Im stuck.

**Statistics**

Employees in a large computer firm claim that the mean salary of the firm’s programmers is less than that of its competitors. The competitor’s salary is $47,000. A random sample of 30 of the firm’s programmers has a mean salary of $46,500 with a standard ...

**maths**

simn spent 2/5 of his pocket money on a computer game he spent 25% of his money on a ticket for a football match what is the fraction of his pocket money that he had left

**geometry**

given that a/b=c/d, decide whether it is true or not that a/c=b/d.

**geometry**

26

**Math**

log2(x)- log2(7) does this equal 1?

**pre-calculus**

what is the F-^1 of 6/x+4

**Chemistry**

oh my work wasn't entered correctly. the 0.5 M, 2nd +s, and 0.5+s should be under Ba+

**Chemistry**

How many grams of BaCO3 will dissolve in 3.0 L of water containing a Ba+2 concentration of 0.5 M (Ksp= 5.1E-9) My work: BaCO3 <-> Ba+ + CO3- i 0.5 M c -s +s +s e 0.5 +s +s (s)(0.5+s)= 5.1E-9 s= 1.0E-9mol/L x 3.0 L x 197.336 g/L= 5.92E-6 grams of BaCO3 dissolved ^Is this ...

**Physics**

Two students are on a balcony 19.6 m above the street. One student throws a ball (ball 1) vertically downward at 15.8 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the balcony on the way down...

**Chemistry**

How do I take into account the change in volume?

**Chemistry**

Calculate the pH of the 0.20 M NH3/0.20 M NH4Cl buffer. What is the pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 65.0 mL of the buffer?

**biology**

Discuss possible benefits and drawbacks of a transgenic organism such as Bt corn?

**chemistry**

In the chemical equation wA+ xB-> yC+zD, a comparison of the number of moles of A to the number of moles of C would be a?

**Math**

A pond 100 ft in diameter is surrounded by a circular grass walk 2 feet wide. Find the are of the walk. Answer in terms of π. Please help me! TY

**Earth Science**

Which of the following layers of the atmosphere is closest to the ground?

**earth**

Atmosphere Homework! 1.Which of the following layers of the atmosphere is closest to space? 2.A barometer measures? 3. The atmosphere contains tiny solid particles called what? 4.The process by which the atmosphere slows Earth's loss of heat to space is called the ..? 5....

**2nd Grade Math**

Jordan spent $6.37 on a book and $1.23 on a magazine. How much did he spend all together? First estimate the costs and the totals. _____+______=______ Then use partial sums and solve. _____

**algebra help**

(-2,2) (4,20) Find the value of x when y is 9.

**accouting**

Company E December 31, 2010 Assets $42,000 $32,760 $26,880 $74,760 $114,660 Liabilities 34,440 22,932 14,515 51,584 ? December 31, 2011 Assets 45,000 32,400 ? 81,900 124,200 Liabilities ? 22,032 14,773 39,312 98,118 During year 2011 Stock issuances 6,000 1,400 9,750 ? 6,500 ...

**chemistry**

in the chemical equation :2C2H6+7O2->4CO2+6H2O, hOW many moles of c2h6 will you need to form 2.34 mol of co2? How many moles of water will be produced?

**HSM 220 Week 6 Budget Matrix**

I am having some help with this assignment. I have filled it in with what I think is correct but am not positive with my answers. Can someone please help me? The assignment is due tomorrow (4-21-11) Budget Matrix You are the executive director of a local government workforce ...

**math**

How do you find one fourth or two thirds?

**English**

Write a story using the words alcove, bigoted, clandestinely, corrugated, futile, inexorably, plausible, ramification, sanguine, and scrutinized. It can be any version of the word and they can be in any order.

**Chemistry**

In one trial of an investigation 50.0 mL of HCl(aq) of an unknown concentration is Tiresias with 0.10M NaOH (aq). During the titration the total volume of NaOH (aq) added and corresponding pH value of the reaction mixture are measured and recorded in the table below: 10mL-1....

**Chemistry**

What is the percent yield of a reaction in which 240. g phosphorus trichloride reacts with excess water to form 142 g HCl and aqueous phosphorus acid?

**Math**

okay that's what i wasn't sure of thanks

**Math**

write the equation in slope intercept form 6x+3y=12 i got y=2x+4 but i don't think i am right please HELP!!!

**Math**

OHHHH now i see thanks

**statistics**

what number is 16 percent of the variable y

**physics**

A trapdoor on a stage has a mass of 20.8 kg and a width of 1.51 m (hinge side to handle side). The door can be treated as having uniform thickness and density. A small handle on the door is 1.41 m away from the hinge side. A rope is tied to the handle and used to raise the ...

**physics**

In preparation for a demonstration on conservation of energy, a professor attaches a 8.7-kg bowling ball to a 3.2-m-long rope. He pulls the ball 18° away from the vertical and holds the ball while he discusses the physics principles involved. Assume that the force he ...

**Physics URGENT!!!!**

1.A 75 kg passenger in a van is wearing a seat belt whent he van moving at 15m/s, collides with a conrete wall. The front end of the van collapses 0.50 m as it comes to rest. a) what was the paseenger's kinetic energy before the crash b) What average force did the seat ...

**Physics: energy**

The spiral shaft in a grain auger raises grain from a farmers truck into a storage bin. Assume that the auger does 6.2 x 10*5 J of work on a certain amount of grain to raise it 4.2 m from the truck to the top of the bin.What is the total mass of the grain moved?

**Physics**

A boy on a bucycle drags a wagon full of newspapers at 0.80m/s for 30 minutes using a force of 40N. How much work has the boy done?

**calculus**

find the derivative f(x)= 8ln(x^5-2x)

**calculus**

suppose a price-demand function p(x) is defined implicitly by x= p^3-3p^2+200 find p'.

**8th grade math**

The Exotic Pets Club has 23 members, all of whom have a snake, an iguana, or a tarantual. Four members have all three kinds of pets. Ten members have a snake, 14 have iguanas, and 13 have tarantulas. Two have a snake and an iguana, three have an iguana and a tarantula, and one...

**chemistry**

Write the overall ionic equation and the net ionic equation for the reaction between BaCl2 and Na2SO4 in aqueous solution, indentify the spectator ion and the precipitate ion for this reaction. help :(

**Chemistry**

Write the equation for the dissolution of (NH4)2S04 in water. How many moles of each type of ion, and how many total moles of ions does the dissolution of 0.5 mol of (NH4)2S04 produce? help pleaseeeeee ASAP

**Math**

Let R be the plane region bounded by x=1, x=5, the x-axis and y=1/x. Approximate the are of R using 8 right rectangles.

**Physics**

62.5

**Trig**

What is the exact value of sin^-1(sin(8pi/15)?

**Science**

How many times a year does the moon go through its cycle or phases?

**english**

what other ideas does Tom Corbett have in place to save money in PA?

**science**

How many times a year does the moon go through its cycle or phases?

**physics**

A bar made of a particular metallic alloy has a length of 10 cm at a temperature of 24 oC and a length of 10.015 cm at the boiling point of water. (a) If a second bar made of the same material were 10 m at 24 oC, how much longer would this bar be at the boiling point of water...

**english**

so they agree with the plan because it will provide money for rebuilding prisons

**english**

How does the GOP feel about Tom Corbett decision to cut education funding for schools in Pennsylvania?