Wednesday

November 26, 2014

November 26, 2014

Total # Posts: 258

**Math-Calc**

The lim as x goes to 0- for cos(x)/sin(x). I know the answer is negative infinity but I don't really understand why.
*June 8, 2011*

**Calculus**

A rectangle is inscribed with its base on the x axis and its upper corners on the parabola y= 12 - x^2. What are the dimensions of such a rectangle with the greatest possible area?
*June 1, 2011*

**Science**

I'm in 6th grade and I need help for my science project. I don't even know what to do. Any fun science projects for 6th graders?
*May 21, 2011*

**lit**

is this sentence punctuated correctly ?My grandfather's favorite quotation is E.E. Cummings's, "The most wasted of all days is one without laughter."
*May 10, 2011*

**physics **

Two charges are separated by a distance d = 5 m. The charge q1 has a charge of q1= 7.0 µC (microcoulombs) and q2 has a charge of q2= 6.8 µC. What is the force between the charges?
*May 1, 2011*

**Math- Calculus**

Let f be a function such that f(-1)=3 and f'(-1)=6 let h(x)=x^5f(x) evaluate h'(x) at x=-1
*April 19, 2011*

**math**

If the true population standard deviation was known to be 3.0, then approximately what minimum sample size would you need in a simple random sample if you want a 95% confidence interval for the mean to have a margin of error of .5 or less?
*April 14, 2011*

**math**

Find a polynomial f(x) with leading coefficient 1 and having the given degree and zeros. Each polynomial should be expanded from factored form, simplified and written in descending order of exponents on the variable. For example: (x+5)(x-2) should be given as the answer x^2 + ...
*April 12, 2011*

**algebra**

if the discriminant of (5u^2)+bu+2=0 is 41, what are all the values of b
*March 24, 2011*

**6th grade Math**

Thank you!
*March 2, 2011*

**6th grade Math**

9 + 5k = 45 + 2K the sample shows operation S9 to come up with 5K=36+2k assuming subtract 9 from the 45 sample shows K=12 how did they come up with that?
*March 2, 2011*

**geometry**

Find the area of a rectangle that has one side measuring 10 cm. and a diagonal measuring 26 cm.
*February 14, 2011*

**Physics- Exercise 10**

A 500kg pig is standing at the top of a muddy hill on a rainy day. the hill is 100.0m long with a vertical drop of 30.0m. the pig slips and begins to slidedown the hill. What is the pig's speed at the bottom of the hill? Use the Law of conservation of Energy.
*February 3, 2011*

**Physics**

while on the moon, the Apollo astronauts enjoyed the effect of a gravity much smaller than that on earth. if Neil Armstrong jumped up on the moon with an initial speed of 1.51 m/s to a height of 0.700m, what amount of gravitational acceleration did he experience?
*February 3, 2011*

**Chemistry**

I'm sorry I'm just really confused by ionization energies and the heat of formation. Could you explain how to set up this problem? Use the data (kJ) for ionization energies, electron affinities and heats of formation to find the lattice energy of Fe3O2(s) according to ...
*January 27, 2011*

**English**

The forth one is correct and that is it. The other examples are extremely grammatically incorrect.
*December 22, 2010*

**Algebra1**

How would i get the problem to become 3x+5x=17+7...do i add like terms?
*December 12, 2010*

**Algebra1**

0.32
*December 12, 2010*

**Algebra1**

2x-7+x=11-5x+6
*December 12, 2010*

**11th grade**

a rock is dropped from a 20.0m bridge falls into the river below. a.)at whqat velocity does it strike the water? b.)how much time did the rock take to reach the water?
*December 12, 2010*

**physics**

when Chris slams a basketball he has a vertical leap of 1.46 meters. what must his initial vertical velocity be in order for him to reach this height?
*December 9, 2010*

**6th grade**

Thank you very much for your help. I had the same answer. I'm trying to explain the reciprocal to my daughter, she is worried that her teacher will say the answer is wrong.
*December 9, 2010*

**6th grade**

Isn't this a division problem? I have to divide 1-1/2 into two parts.
*December 9, 2010*

**6th grade**

I was told that when dividing a mixed number you write the reciprocal of the second number and then multiply and that will change the answer.
*December 9, 2010*

**6th grade**

What steps do we use to change 1-1/2 cups in half?
*December 9, 2010*

**Chemistry**

What is the ionization energy (in kJ/mole) of the hydrogen-like ion F8+ ?
*December 5, 2010*

**Math**

estimate a 15% tip on a $42.65 check
*November 20, 2010*

**Algebra **

Write the equation of the prpendicular bisector of the line segment AB with endpoints A(1,1) and B(7,5). Write the answer in slope-intercept form.
*November 18, 2010*

**math**

Write the equation of the perpendicular bisector of the line segment AB with endpoints A(1,1) and B(7,5). Write your answer in slope intercept form.
*November 16, 2010*

**economics**

Can you help me describe National Debt in 2 paragraphs?
*November 15, 2010*

**Chemistry**

Based on the balanced equation, C2H4 + 3O2 → 2CO2 + 2H2O calculate the molecules of H2O formed when 135 molecules of O2 are reacted.
*November 7, 2010*

**Chemistry**

three different liquids are used in a manometer. (a) derive an expression for P1-P2 in terms of ro(a), ro(b), ro(c), h1, and h2 (b) suppose fluid A is methanol, B is water, and C is a manometer fluid with a specific gravity of 1.37; pressure P2=121.0 kPa; h1=24.0 cm. Calculate...
*November 7, 2010*

**Social studies**

What were the economic, political, and social aspects of New Netherland, New Spain and New France?
*October 17, 2010*

**math**

A department contains 12 men and 17 women. How many ways are there to form a committee with 6 members if it must have strictly more women than men? It is strongly recommended that you do this on paper! how do i solve this in the calculator?
*October 10, 2010*

**Physical chemistry**

100g of water at 30.0C is mixed with 150g of water at 85.0C. What is the final temperature of th mixture assuming no heat is gained or lost during the mixing process?
*October 10, 2010*

**Physics Please Help**

convert grams into kilo grams: 95/1000 = .095 kg x = sqrt MV^2/k x = sqrt .095(3.4)^2/70 x = .12525 x = .13 m x = 13 cm
*October 7, 2010*

**College Chemistry**

Balance this equations for redox reactions in basic solution. Fe(OH)3(s) + OCl- ¨ FeO42- + Cl-
*September 23, 2010*

**college**

Pretend the program in Senegal had been reducing infant mortality at a rate of 11 % per year. How long would it take for infant mortality to be reduced by 39 %?
*September 21, 2010*

**math**

write the multiplication/division fact family for 2, 7, and 14.
*September 14, 2010*

**physics**

heather and Matthew walk with an average velocity of .89 m/s eastward. it takes them 44 min to walk to the store. what is their displacement?
*September 1, 2010*

**Business**

compensation plans, this book calls it pay plan.
*July 7, 2010*

**Business**

why do small businesses need a pay plan?
*July 7, 2010*

**math 5th grade**

theo's bedroom measures 12 3/4 ft by 9 2/3 ft.
*June 3, 2010*

**math 5th grade**

theo wants to put a dinosaur border around the perimeter of his room. How many rolls of border must he buy if each one covers 10 ft?
*June 3, 2010*

**math 5th grade**

two numbers have a product of 3 1/5 and a sum of 3 3/5. One of the numbers is a whole number. find the numbers.
*June 3, 2010*

**math 5th grade**

Attendence at the firemans ball has been declining. Each year the number attending is 2/3 of the previous years attendence and the cost of food is 3/4 that of the previous year. In what year will the attendence be less than 1/3 the original attendence?
*June 3, 2010*

**math 5th grade**

Of the 2800 cars produced one month,1/14 were chosen to be inspected.1/20 failed the inspection. How many cars failed insperction?
*May 31, 2010*

**math 5th grade**

A certain piece of a car's material expands by 1/12 its origial length in extreme heat. If the piece begins with a length of 30 in., how long will it be after it expands?
*May 31, 2010*

**1st grade/english**

four kinds of sentences
*May 26, 2010*

**Science**

4cm times 2cm times 3cm=24cc density = mass/ volume = 19.2 divied by 24 is 0.8 or .8
*April 20, 2010*

**Science**

Do you know at what level PCE concentrations are of concern? Is 8,300 PPB a major problem?
*March 3, 2010*

**english**

what are the literary devices in the song " if today was your last day" by nickelback?
*February 15, 2010*

**spelling**

what is the answer to this analogy? must start with the letters scr, spr, str, or thr. couldn't:wouldn't ; green ????also for fifteen: five: nine ???
*February 1, 2010*

**spelling**

analogies for couldn't wouldn't as green is to ?
*February 1, 2010*

**geometry**

line RS=line UT and line RT= line US prove triangle RST= triangle UTS
*December 13, 2009*

**dressmaking**

Mrs. Shotto was once one of your regular customers, but she hasn't asked to have any garments made in approximately one year. You note she has lost weight. She would like you to make her a special silk blouse to replace a favorite blouse that has worn out. The blouse has ...
*December 2, 2009*

**fibers and fabrics**

Which one of the following is the most complete and accurate definition of fiber? A. A stringy substance from plants B. The hair of an animal C. Man-made threads and yarns D. Basic raw material from which fabric is made 2. An example of a natural fiber is A. nylon. B. Dacron...
*December 2, 2009*

**problem solving math**

In the farm pet club pet show, 44 pets are entered. There are 3 times as many dogs as cats and half as many ferrets as dogs. How many of each are there?
*November 30, 2009*

**Physics**

Microwaves with λ = 1 mm are incident upon a 10 cm slit. At a distance of 1 m from the slit, what is the width of the slit's image? The answer is supposed to be 10 cm. I can't seem to get that though. Can someone explain?
*November 5, 2009*

**algebra**

how many quarts of pineapple juice should Theo add to a 20% pineapple drink to create 5 quarts of a 50% pineapple juice mixture?
*October 20, 2009*

**math**

you subtract 25 from each side of the equation to get 3x=45. then you divide each side by 3 to get x=15. your just undoing the math
*October 20, 2009*

**Physics**

It's an experiment. In Part 2.2.4 of the experiment, some light that reflects off the apparatus or from neighboring stations strikes the photometer even when the direct beam is blocked. In addition, due to electronic drifts, the photometer does not generally read 0.0 mV ...
*October 8, 2009*

**Physics**

A bothersome feature of many physical measurements is the presence of a background signal (commonly called "noise"). It is necessary, therefore, to subtract off this background level from the data to obtain a valid measurement. Suppose the measured background level ...
*October 8, 2009*

**5th grade**

How many different four-digit numbers can you make from the digits 1,2,3, and 4 if each digit is used only once?
*October 6, 2009*

**Physics**

so, q is the elementary charge times 2, and Q is the charge of lead? what is that? and thanks, the concepts are much clearer.
*April 30, 2009*

**Physics**

Here's the question I'm currently working on... What initial kinetic energy must an α particle have if it is to approach a stationary lead nucleus to within a distance of 35.9 fm? So I looked up a couple of things I thought we need for this problem. I have the ...
*April 30, 2009*

**Physics**

wait, aren't we lookng for the mass, too?
*April 19, 2009*

**Physics**

OK, so I'm having some serious problems with this one question. It's on relativity. Here it is: Calculate the mass of a proton (m0 = 1.67E-27 kg) whose kinetic energy is one sixth its total energy. How fast is it traveling? THANKS!!
*April 19, 2009*

**Physics**

that's what i thought, too. but it's not. 2n(material)t= m*(wavelength/2) going from a medium with higher n to lower n, you divide the wavelength by 2. thanks for the help, though. i eventually figured it out!
*April 7, 2009*

**Physics**

So I'm having some trouble with this problem.. Is there an equation or is it just a ratio? I'm having so many problems with this one! THANKS! What is the minimum thickness of coating which should be placed on a lens in order to minimize reflection of 531 nm light? The ...
*April 7, 2009*

**Math**

Have to do an enlargement project and enlarge an everyday item by 10 times it original size. Part of grade is level of difficulty so do not want to do something simple. Older sister did a lego piece. Need some good ideas on a item and am stumped!
*March 6, 2009*

**Geometry**

If 9 counters are 1/3, then what is ONE? HELP PLEASE!!!!!!!!!!!!!:():
*March 5, 2009*

**Algebra I**

By forming carp pools(no spaces).
*March 2, 2009*

**physics**

This is going to be hard to explain, but here goes! Four resistors, R1 = 30.0 ohm, R2 = 52.0 ohm, R3 = 93.0 ohm and R4 = 17.0 ohm, are connected to a battery with a terminal voltage of 18.0 V, as shown in the figure below. ____R1____R2__________ | | |_______R3_____________...
*February 17, 2009*

**French**

I want to say "I got an A on my history test." So I am going to say "J'ai eu "A" a mon interro histoire." This is the literal way to say it, but is this correct? Merci!
*January 29, 2009*

**math**

the equation is 4(2x) to the power of negative 2 times (x to the power of 2 y) im confused can someone explain how to do it?
*December 17, 2008*

**Organic Chemistry**

How would you expect the following series of compounds to compare in behavior for SN1 vs SN2? CH3CH=CHCH2Br CH3CH2CH2Br CH3C(-Br)=CHCH3 on the last one, Br is a substituent of the C and that C is double bonded to CHCH3 Please help! Even if someone could just help me get ...
*November 26, 2008*

**social studies**

no the southerns were living in a dept cycle
*November 18, 2008*

**science**

in what organelles do plants trap light energy is it vacuoles, Golgi bodies, chloroplasts or endoplasmic reticulum
*November 4, 2008*

**8th grade**

what is your average spped if you ran 50 meters in 10 seconds?
*October 27, 2008*

**PreCalc!**

sketch a graph whose domain is the interval [0, infinity) but whose domain must be restricted to [0,4] so that the function can have an inverse. (The only one i can think of is a parabola but she said we cant use that one) Consider the 2 statements: I. if f(a)=b then f(inverse...
*October 20, 2008*

**chemistry**

32363.376 kJ/mol
*October 3, 2008*

**Math - Trig Substitution**

How can I solve the integral of x^3√(9-x^2) dx using trigonometric substitution? ? ∫ x^3√(9-x^2) dx So then I know that x = 3sinθ dx = 3cosθdθ When I substitute, it becomes ∫ (3sinθ)^3 * √(9-(3sinθ)^2) * 3cosθdθ...
*September 8, 2008*

**Math differentiation**

1. y = x^x 2. y = (sin^2xtan^4x)/(x^2+1)^2 3. y = x^(1/x) 4. y = 2^(-x^3) Okay, so I'm pretty sure 1 is done easily: ln y = ln (x^x) ln y = x ln x d/dx ln y = d/dx x ln x y'(1/y) = x(1/x) + ln x(1) = 1 + ln x y'(1/y) = ln x + 1 y' y(1/y) = (ln x + 1)y y'...
*August 27, 2008*

**Math differentiation**

Can somebody please check these over for me? I really want to know what I did wrong if I made mistakes! Differentiate the following: 1. y = ln [(4-x)/(4+x)] Since it's the ln of the entire thing, then I can apply ln a - ln b so, dy/dx = y' = 1/(4-x) *(-1) - 1/(4+x) *(1...
*August 26, 2008*

**Math integrals**

What is the indefinite integral of ∫ [sin (π/x)]/ x^2] dx ? This is what I did: Let u = π/x (to get the derivative and du:) π*1/x π(-1/x^2)dx = du π(1/x^2)dx = (-1)du so, 1/x^2 = -1/πdu then ∫ [sin (π/x)]/ x^2] dx = ∫ sin(u...
*August 15, 2008*

**Math derivatives**

What is the derivative of: a) cos(3x) b) π/x I did (a) just by following chain rule: -sin(3x)*3 so it's -3sin(3x) Is that correct? I'm not completely sure how to do (b). Would it just be like the derivative of 1/x? That's -1/(x^2), would it be -π/(x^2) ?
*August 15, 2008*

**Math**

How many real roots does f(x) = x^3+5x+1 have? x^3 = odd polynomial = at least 1 real root Can I follow Descartes' rule for this? No sign change, so there aren't any positive zeros. when I sub in -x for x (-x)^3+ 5(-x) + 1 = -x^3-5x+1 Then there is one sign change, so ...
*May 31, 2008*

**American Hictory-Colonial**

How can you make a tri cornered hat out of newspaper. Like the hat paul revere wore, except made out of newspaper. Please help! Its for an AH project!
*May 15, 2008*

**Math, derivatives**

Let g(x) = sin (cos x^3) Find g ' (x): The choices are a) -3x^2sinx^3cos(cos x^3) b) -3x^2sinx^3sin(cos x^3) c) -3x^2cosx^3sin(cos x^3) d) 3x^2sin^2(cos x^3) I'm not exactly sure where I should start. Should I begin with d/dx of sin? Or do the inside derivative first...
*May 11, 2008*

**Chemistry, acids and bases**

One of the other values I have to plug in for HCl is 0.803 mols/L So then at equilibrium, NaC6H5COO is 0.197, NaCl is 0.803, C6H5COOH is 0.803 If I plug it into Henderson Hasselbach equation: pH = pKa + log [0.197]/[0.803] the log of 0.197/0.803 is negative, -0.61 Can I still ...
*May 6, 2008*

**Chemistry, acids and bases**

NaC6H5COO- (aq) + HCl (aq) <---> NaCl (aq) + C6H5COOH (aq) should say NaC6H5COO (aq) + HCl (aq) <---> NaCl (aq) + C6H5COOH (aq) and 0.8 NaC6H5COO, not 0.8 NaC6H5COO-
*May 6, 2008*

**Chemistry, acids and bases**

(a) Find pH and pOH of 1.0 M solution of sodium benzoate, NaC6H5COO. (Ka of benzoic acid is 6.2x10^-5) (b) Calculate pH after 0.205 moles per liter of HCl was added (assume volume does not change (c) Calculate pH after 1.0 moles per liter of HCl was added (assume volume does ...
*May 6, 2008*

**Chemistry, reactions w/ water**

Write the equation for the reaction of each of the following with water. a) HCl b) CH3COOH c) NaOH d) NH3 Are these correct? a. HCl (aq) + H2O (l) --> H3O+ (aq) + Cl- (aq) b. CH3COOH (aq) + H2O (l) --> CH3COO- (aq) + H3O+ (aq) c. NaOH (aq) + H2O (l) --> Na+ + OH- + ...
*May 6, 2008*

**Gen 105**

Objective of Exercise: Conduct research online regarding the strongest of your multiple intelligences. Find three Web sites which accurately describe that intelligence. If you identified more than one dominant intelligence, choose only one for your research. Note that your ...
*April 9, 2008*

**chemistry**

ammonia, NH3, is a typical ingrediant in household cleaners. it is produced through a combination reaction involcing N2(g) and H2(g). if 12.0 mol of H2(g) react with excess N2(g), how many moles of ammonia are produced?
*April 9, 2008*

**English**

largloi is gorilla osmoe is mouse swarlu walrus clame is camel
*February 28, 2008*

**MATH**

i really need help with writing linear equations to fit data. Can you help me?
*January 27, 2008*

**Fourth Grade Geometry**

If 9 counters are1/3, then what is ONE? PLEASE HELP!!!!!!!!!!!!!!!:(
*January 9, 2008*

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