Tuesday

July 7, 2015

July 7, 2015

Total # Posts: 3,029

**Math**

A consumer buys n light bulbs, each of which has a lifetime that has a mean of 800 hours, a standard deviation of 100 hours, and a normal distribution. A light bulb is replaced by another as soon as it burns out. Assuming independence of the lifetimes, find the smallest n so ...
*April 27, 2011*

**trig**

use a sum or difference identity to find an exact value cos pie/12
*April 26, 2011*

**trig identies 5.3 &5.4**

cos pie/12
*April 26, 2011*

**trig identies 5.3 &5.4**

use a sum or difference identity to find an exact value pie/12
*April 26, 2011*

**chemistry**

how many grams of NH3 are in 250 ml of a 20% (w/v) ammonia solution
*April 25, 2011*

**pyschology **

I need an idea to get started please help me Thanks 1.First, choose two personality disorders: I'll choose Paranoid or you can choose one for me please •Schizoid •Paranoid •Antisocial •Borderline •Histrionic •Narcissistic •Avoidant •...
*April 22, 2011*

**pschology **

Ok thank you. I'll look it up and other disorders too and see if I can answer the questions but if still don't get them i'll came back.
*April 21, 2011*

**pyschology **

I'll choose the Conduct Disorder but I don't know about the characteristics of this disorder.
*April 21, 2011*

**pschology **

Just answering the questions for me because I dint know what to do so thanks
*April 21, 2011*

**pschology **

Plaes help me with this I need it as soon as possible... Thanks 1.Choose one of the disorders listed below: •Tourette’s Syndrome •Oppositional Defiant Disorder •Conduct Disorder •Anxiety Disorder •Bipolar Disorder You can choose one for me and do ...
*April 21, 2011*

**psychology**

ok I'll choose the Paranoid and Schizoid
*April 21, 2011*

**Specific heat**

When 1500 joules of energy is lost from 0.12kg object the temperature decreases from 45 to 40 What is the specific heat of this object ? Of what material is the object made?
*April 20, 2011*

**math**

The lifetime (In Years) of Manufactured product is Y=5X^0.7, where X has an exponential distribution with mean 1. Find the distribution function of PDF Y.
*April 20, 2011*

**Math(Probability)**

Let X be N(0,1) find the p.d.f of Y=|X|, a distribution that is often called the half normal.
*April 20, 2011*

**Calculus**

Find the equation of the line tangent to the graph of y=4 e^x at x=2. I always get confused with tangent lines I worked this out to be 4e^x(x-2)+4e^2 but the program i have to submit it to says its wrong.
*April 19, 2011*

**Chemistry**

What is the final temperature when 750 J of energy is added to 9.0 g of ice at 0.0 degress C?
*April 19, 2011*

**math**

hello i need help with system of equations theres 3 only thank you 2x+3y-17 3x+y=31 2(x-3y)=24 y=3x-2 2(x+4)=24 x+y=17
*April 18, 2011*

**math**

hello i need help with system of equations theres 3 only thank you 2x+3y-17 3x+y=31 2(x-3y)=24 y=3x-2 2(x+4)=24 x+y=17
*April 18, 2011*

**math **

hello i need help with system of equations theres 3 only thank you 2x+3y-17 3x+y=31 2(x-3y)=24 y=3x-2 2(x+4)=24 x+y=17
*April 18, 2011*

**Algebra**

What can you multiply to get 5 and add to get 6 (two numbers both the same numbers)??? Help
*April 17, 2011*

**college chemistry**

If the equilibrium constant (Keq) equals 9.12x1012 for the following reaction between strontium and magnesium: Sr(s) + Mg2+(aq)<==> Sr2+(aq) + Mg(s) Calculate Eo for a strontium=magnesium battery.
*April 13, 2011*

**Essay conclusion**

Thanks!
*April 13, 2011*

**Essay conclusion**

I am trying to write a conclusion for my essay about connecting my author's life to her books. Can anyone give me some tips on how to write a conclusion without simply restating what I said in the introduction? Thank you!
*April 13, 2011*

**science**

Never smell the chemical by sticking your nose right over the beaker, instead, you should gently waft the vapors toward your nose.
*April 13, 2011*

**college chemistry**

If the equilibrium constant (Keq) equals 9.12x1012 for the following reaction between strontium and magnesium: Sr(s) + Mg2+(aq)<==> Sr2+(aq) + Mg(s) Calculate Eo for a strontium=magnesium battery.
*April 13, 2011*

**science**

Choose one yourself, no one is going to do your homework for you. Go ahead and think about it, and we can look at what you come up with. I'm going to give you a hint: there is pretty much no wrong answer to this, it's just whatever you make up.
*April 13, 2011*

**math **

Okay, for the first one, just do the (x-3)^2 like you normally do, then multiply everything by -2. with the second one, do (x-4)^2 like you normally do, then multiply by -1. Now, just add 3.
*April 13, 2011*

**math **

I was just writing it out, it's the same thing you did when you got x^2, I was just showing multiplying the two x's. And it it three terms when you add like terms together. I'll continue with what I did before. x^2 -3x -3x +9. You basically did the same thing, only...
*April 13, 2011*

**math **

I'm going to start you off on this one, but you already asked one a lot like this, and we are not going to do your homework for you. (x-3)(x-3) x(x) + x(-3) + x(-3) + -3(-3) You should be able to figure it out from there.
*April 13, 2011*

**math**

First, you need to distribute with the two different parentheses. 5(2x)+5(6) = -4(-5) + -4(-2x) + 3x. When you multiply, you get 10x + 30 = 20 + 8x + 3x combine like terms 10x + 30 = 20 + 11x Now, you need to get x alone in order to solve it. so, you subtract 20 from both ...
*April 13, 2011*

**math**

Write it like this: (7x+3y)(7x+3y) Our teacher tells us to Foil, which means we multiply the Firsts, the OUters, the Inners, and the Lasts. If you do this, you get 7x(7x) + 7x(3y) + 7x(3y) + 3y(3y) 49x^2 + 21xy + 21xy + 9y^2 49x^2 + 42xy + 9y^2
*April 13, 2011*

**Essay titles**

Okay, thanks! I wasn't sure if it was still italicized if it was in the title or not, and I couldn't find it easily on the websites about MLA.
*April 13, 2011*

**Biology**

What are some recent (a few months old would be fine) newspaper articles (found online) about molecular biology? (Eg: cloning, genetically modified food, mutation, etc)
*April 12, 2011*

**Chemistry**

thanks, that helps alot
*April 11, 2011*

**Chemistry**

Can you help me with solving this? I don't just want the answer,but how to do it. The average distance between Mars and Earth is about 1.3 108 miles. How long would it take TV pictures transmitted from the Viking space vehicle on Mars' surface to reach Earth? (1 mile...
*April 11, 2011*

**Physics**

A 200-Ù resistor, 40.0-mH inductor and a 2.00-ìF capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the phase angle of this circuit?
*April 11, 2011*

**Physics **

A 7uF capacitor is charged to a potential difference of 110V The electrical energy stoed in the capacitor is (4.2x10^-2 was the given answer) but I used C=Q/V and keep getting 7.7x10^-4 also A particle of charge Q and mass m is accelerated from rest through a potential ...
*April 10, 2011*

**physics**

Silicon is doped an acceptor of 10^18/cm^3. Find the electron and hole concentration, the electron and hole mobilities, and the resistivity of this silicon material at 300 K. Is this n-type or p-type?
*April 10, 2011*

**chemistry**

If 448 L of ethene gas are reacted with excess water at STP, how many grams of ethanol will be produced?
*April 7, 2011*

**Chemistry**

A 100.0 mL sample of 0.20M HF is titrated with 0.10M KOH. Determine the pH of the solution after the addition of 100.0 mL of KOH. The Ka of HF is 3.5 x 10^-4
*April 7, 2011*

**statistics**

You are a travel agent and wish to estimate, with 98% confidence, the proportion of vacationers who use an online service or the Internet to make travel reservations. Your estimate must be accurate within 4% of the population proportion. a) No preliminary estimate is available...
*April 6, 2011*

**Algebra**

6x^2+9cx= 6c^2 I tried moving the 6c^2 to the other side of the equation, then factoring (36) to arrive at (6x^2+12cx) (-3cx-6c^2)...then....6x(x+2c) -3c(x+2c)...but I am not getting it? The answer in the book is...-2c, c/2?
*April 5, 2011*

**algebra**

x^2-4x-5=0 (x+1) (x-5)=0 x+1= 0 x-5= 0 -1 -1 +5 +5 x=-1 x=5
*April 5, 2011*

**math**

What is 3 yd 1 ft - 1 yd 2 ft?
*April 5, 2011*

**HHS**

is that I for iodine?
*April 4, 2011*

**Math**

9*10^10
*April 4, 2011*

**trig**

what is the question? is it 2cos(pi^2)/(8-1)?
*April 4, 2011*

**Physics**

further from higher level unless there is no gravity in which case they will both travel forever at the same speed
*April 4, 2011*

**Diff EQ**

Find all critical points of the given system and investigate the stability of each. dx/dt = y - 1 dy/dt = x^2 - y
*April 4, 2011*

**Calc,**

you do it by converting it to int[x/x^(3/2)+2/x^(3/2)]= int[1/x^(1/2)+2/x^(3/2)]= int[x^(-1/2)+2*x^(-3/2)]= [2x^(1/2)-4*x^(-1/2)]x=16...25= 10-4/5-8+1= 11/5
*April 4, 2011*

**American History**

agricultural
*March 31, 2011*

**American History**

i think its c
*March 31, 2011*

**American History**

During the Carter administration, Zbigniew Brzezinski A. tried to reverse the policy of détente. B. rejected the adoption of the MX missiles to replace the older Minute Man missiles. C. was directly involved in continuing the SALT talks. D. tried to get Carter to roll ...
*March 31, 2011*

**english**

I am doing something called "Mystery word match". you have to combine all three words to make another word. renovate activity motion Bones do_ _ _ _ _ _ _ _ (8 letters)
*March 28, 2011*

**Math**

can you prove this equation for me? sin2x X sec2x = 2sinx
*March 25, 2011*

**FMU**

After 2.02 g of Al has reacted completely with 0.400 L of 2.75 M HCl (the excess reactant), what is the molarity of the remaining HCl? 2Al(s)+6HCl(aq)-->2AlCl3(aq)+3H2(g)
*March 24, 2011*

**Science**

If the perimeter of the rectangular ball field is 1 kilometer which of the following could be the field's dimensions? L=312m W=188m or L= 1/2 m W = 1/2 m
*March 23, 2011*

**Math**

If the perimeter of the rectangular ball field is 1 kilometer which of the following could be the field's dimensions? L=312m W=188m or L= 1/2 m W = 1/2 m
*March 23, 2011*

**geometry**

The shortest side of a polygon of area 196 sq. in. is 4 in. long. Find the area of a similar polygon whose shortest side is 8 in. long.
*March 23, 2011*

**8th grade science**

no, a vector has magnitude and direction while sound intensity just has magnitude..
*March 23, 2011*

**Algebra**

Of what percent of 320 is 180?
*March 20, 2011*

**Chemistry**

The following rearrangement reaction is first order: C3H6 ¨ CH3CH=CH2 The rate constant for this reaction is 6.7 ~ 10−4. How many minutes will it take for the concentration of C3H6 to drop to 11.75% of its initial value? How do I calculate this step by ...
*March 20, 2011*

**Chemistry **

A first order reaction has a rate constant of 0.0733 s−1. What is the half life for this reaction in seconds? when I plug in the numbers in the formula, my answer was 9.45. But on the computer it says the answer is wrong. How do I find the right answer?
*March 20, 2011*

**chemistry **

what is the concentration in percent volume of 60mL or methanol in a total volume of 500mL
*March 17, 2011*

**chemistry**

CALCULATE THE NUMBERS OF MOLES OF POTASSIUM CHLORATE THAT MUST DECOMPOSE TO PRODUCE POTASSIUM CHLORIDE AND 1.80 MOLES OF GLYCOGEN GAS
*March 16, 2011*

**Math**

If a race car travels a circular track, total 1 mile. What is its displacement?
*March 15, 2011*

**Math**

Find x > 3 such that ln(x) < x^(0.1)
*March 15, 2011*

**Chemistry**

A sample of air occupies 3.8 L when the pressure is 1.2 atm. (a) What volume does it occupy at 7.3 atm? (b) What pressure is required in order to compress it to 0.050 L? (The temperature is kept constant.) I already know the answers to each question, but do not understand how ...
*March 14, 2011*

**Printing**

What are the three standard sizes of paper used in the U.S.? List the size (dimension) then the name
*March 14, 2011*

**computers**

What is the typical screen resolution of a computer monitor? A) 85 B) 200 C) 72 D) 100 dont want the answer, just a hint.
*March 14, 2011*

**Typing**

Thank you.
*March 14, 2011*

**Typing**

If you cut a letter-sized document into 4 equal pieces (4-up), what are the dimensions of each piece?
*March 14, 2011*

**Math**

Thank you.
*March 14, 2011*

**Math**

What is the decimal equivalent of 1/4
*March 14, 2011*

**typing**

What is the size of the margin (inside the business card) to prevent text and graphics from being cut off during trimming
*March 14, 2011*

**Math**

thanks
*March 14, 2011*

**Math**

How many half-inches are in 13"?
*March 14, 2011*

**political science**

Please help Thank you Examining and criticizing the policies and proposals of the majority party is a function of ? The majority party Foreign governments The minority party Government bureaucrats The judicial branch The power an interest group exerts is generally dependent ...
*March 13, 2011*

**Chemistry Help!**

4 NH3 + 5 O2 ¨ 4 NO + 6 H2O If the rate of disappearance of O2 is 0.772, what is the rate of appearance of NO?
*March 12, 2011*

**chemistry( urgent)**

what do we assume about volume of the actual molecules themselves in a sample of gas, compared to the bulk volume overall?why?
*March 10, 2011*

**PHY**

A car is driven east for a distance of 43 km, then north for 25 km, and then in a direction 26° east of north for 26 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total ...
*March 10, 2011*

**calculus**

how can I determine the domain of a function h(x): integrate from 0 to 2x-1 f(t)dt, when the f(x) function is a graph shown and equations for both semicircles in the graph are: square root of 4x-x(squared) and for the second one -square root(1-(x-5)squared). later find ...
*March 9, 2011*

**Newton' law of motion**

A resultant force of 50N pulls a body of mass 10kg along a smooth horizontal surface. Calculate the acceleration with which the body is moved
*March 9, 2011*

**physics**

How to solve a resultant force of 50N pulls a body of mass 10kg along a smooth horizontal surface. Calculate the acceleration with which the body is moved
*March 9, 2011*

**physics**

How to solve a resultant force of 50N pulls a body of mass 10kg along a smooth horizontal surface. Calculate the acceleration with which the body is moved
*March 9, 2011*

**math**

Find the present value of $9000 due at the end of 18 years at 11% per annum compounded quaterly????
*March 8, 2011*

**math**

x+5y= -3 3x-2y= 8 sovle using substituion
*March 7, 2011*

**sci 207**

6. In chapter 3, we discussed carrying capacities. What do you think the maximum and optimum carrying capacities for humans are? Why is this a more complex question for humans than it might be for other species? Why is designing experiments in human demography difficult?
*March 7, 2011*

**Literature 1010**

The third step in effective writing is to A) organize and connect the specific evidence in a paper B) write clear, error-free sentences C) make a point D) support a point with specific evidence
*March 6, 2011*

**Literature 1010**

Papers that are inadequately developed often contain repetition and wordy generalities
*March 6, 2011*

**Literature 1010**

Which of the following is a realistic attitude about writing? A) Writing is an unbearably difficult activity B) Writing is a natural gift C) Writing is hard work D) Writing cannot be compared to skills like driving, typing or preparing a good meal.
*March 6, 2011*

**Literature 1010**

A topic statement is made up of a limited topic and a writer's point about the limited topic? True Or False.
*March 6, 2011*

**Literature 1010**

Writing is best done all at once, rather than a series of stages. t/f i believe it's false, since this destroys the writing process. i could be wrong :/
*March 6, 2011*

**Literature 1010**

Thank you. I should of read it better. Our cats and dog (stay, stays) at a neighbor's house when we go on vacation theses always get me. both ways sound the same, and 5/10 times i get it wrong. i am not looking for answers, but who do i deceiver which way is correct.
*March 6, 2011*

**Literature 1010**

Transitions function much like road signals. A) True B) False this question does not make sense. when i look in my book ans online, i do not see anything referring to the Transitions function can someone tell me what a transition function relating to Literature.
*March 6, 2011*

**ENG1010**

Which of the following is an announcement rather than a topic sentence? A) I want to talk about the increase in the divorce rate. B) Many people have trouble getting along with others. C) Almost one out of every two marriages ends in divorce. D) The divorce rate is increasing ...
*March 6, 2011*

**Math**

How fast does a Ferrari FXX go compared to a Ferrari 575 GTC?
*March 4, 2011*

**science**

Main Entry: dissolve Part of Speech: verb Definition: melt from solid to liquid; mix in Synonyms: defront, deliquesce, diffuse, fluidify, flux, fuse, liquefy, liquesce, render, run, soften, thaw, waste away Antonyms: coagulate, concentrate, solidify, unmix or Main Entry: ...
*March 4, 2011*

**chemistry**

A quantity of 12.75 mL of a KOH solution is needed to neutralize 0.5109 g of KHP. What is the concentration (in molarity) of the KOH solution?
*March 3, 2011*

**social studies**

A penninsula is land that is not completely surrounded by water.An example of a penninsula is Florida
*March 2, 2011*