Posts by Alison

Total # Posts: 356

Statistics
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary of all high school ...

math
Well, I can't be sure I'm right, but here's how I look at it. Red Blue White Green Yellow Each of the above is a color to choose from. There is one that doesn't contain what you need, but you still have to take it into account so let's put that in first. ...

science
composite.

Microsoft word,excel
The insert chart feature does not allow you to do what to a chart?

Last science question
its b

Calc
It is noon. A secret agent is driving a jeep through the desert in the tiny principality of Alta Loma. He is 32km from the nearest point on a straight, paved road. Down the road 16km is a power plant in which a band of international terrorists has placed a time bomb set to ...

Biology..eh:/
If trypsin and chymotrypsin become activated within the pancreas and then are released in their active forms into the bloodstream, why would this represent a potentially life-threatening situation?

chemistry please help me please!!!
.002301 moles because .0195 L x .118 .002301/.017 =molarity(concentration) Answer 0.135mol/L concentration

Physio help please
Nevermind

Physio help please
why might an endurance athlete wish to increase his or hematocrit?

Physiology-help please:(
A child is brought to the speech therapist because she does not pronounce high-pitched sounds (like "s"). Name the sensory organ that is most likely the problem and what area of the organ is being affected? She also experiences extreme dizziness and loss of balance ...

calc
The wheels are connected BT a belt. One wheel has a radius of 10inches and is rotating 40rpm. If the other wheel has a radius of 6inches, what is its angular velocity? Is 200rev/3min correct?

calc
1)Convert 1/20 of a circle to both degrees and radians. All I have is 9/180 is what I come up with. 2) what fraction of a circle does 3pi/4 represent? Is 1/4 correct? 3) a ferries wheel has cars which move at 1.5mph. If the diameter of the wheel is 600 ft, how long will it ...

Finance
Brand Advertising is offered a 3/10 net 40 trade discount by its supplier. In the past Brand has been able to ger away with paying for supplies on credit in 60 days. Since it doesn't have money on hand to take advantage of the discount, it tries to negotiate a loan with ...

Chemistry
A rxn has delta H ^0 rxn=-112kj and delta S^0 rxn =354 J/K. at what temp is the change in entropy for the rxn equal to the change in entropy for the surroundings?

Chemistry
I don't know what they form... D) ZnCl2+ NH3---> E) Cu3(PO4)2 +2NH4OH---> A) NH3+ ZnSO4--> I don't understand what it means by excess... How do I figure out what they form.

Chemistry
Write balanced net ionic equAtions. D) zinc chloride and excess ammonia E) cupric phosphate and lots of ammonia A) ammonia and excess zinc sulfate

CHEM
a 250.0ml buffer solution is 0.250M in ascetic acid and 0.250M in sodium acetate. B). What is pH after addition of 0.0050mol of HCl? C). What is pH after addition of 0.0050mol of NaOH?

Chem
Find pH. A) 0.10M Zn(OH)4^-2 F) Zn(OH)2 in 0.010M ZnCl2 Q) 0.010 M Zn(NH3)4^+2 hint: fined [NH3] then kb for OH^- Im having trouble with these can someone help me.

Chemistry!!!
Consider a solution that is 0.022 M in Fe2+ and 0.014 M in Mg+2. A). If potassium carbonate is used to selectively precipitate one of the cations while leaving the other on solution, which cation will precipitate first? What minimum concentration of K2CO3 will trigger the ...

Chem!!!:/
Determine whether of not each compound will be more soluble in acidic soln than in pure water. Explain. A). Hg2Br2 B). Mg(OH)2 C). CaCO3 D). AgI I think acid, neutral,acid,neutral ??? Help please!:) thAnks

precalc!!!!!
I have to prove this: (a^3-b^3)= (a-b)(a^2+ab+b^2) How do I use long division to get (a^2+ab+b^2). I'm given..... 1). (a^3-b^3)/ (a-b) I cant get that answer. Help?

precalc!!!!!
Use long division : (a^3-b^3)/ (a-b)

Chemistry
Set Kc = (x)(0.2-x)/(0.2-x) . Solve for x. 0.2-x is H2S equilibrium concentration

help chem!:/
a) Calc. PH of 0.010 M HF and 0.030 M KF e) calc. PH Zn(OH)2 in wAter

Chemistry
1.CALCULATE pH of 1.0 L 0.010 M ascetic acid and 0.50 L 0.010 M NaOH. 2. Calculate pH of 1.0 L 0.010 M NaOH and 0.500 L 0.010M HCl Buffer help?

ChemB
CALCULATE PH OF THE SOLUTION THAT RESULTS FROM EACH SOLUTION A) 150.0mL OF 0.25M HF WITH 225.0 mL OF 0.30M NaF Help please, these buffer questions are confusing.

ChemB
A forming acid solution has a pH of 3.25. Which of these substances will raise the pH of the solution upon addition? Explain. A) HCl B) NaBr C) NaCHO2 D) KCl

CHEMISTRY!!!=0
OH, okay so when I produce a strong acid and a strong base it is neutral so pH=7. Meaning the 0.20M KI doesn't even matter?

CHEMISTRY!!!=0
Determine pH of each solution: 0.20 M KI i don't know how you know if you use.. K+H2O->KOH + H or... I- +H2O--> HIO +H Im thinking this one... I- + H2O --> HIO + H 0.20M--------------------0-----------0 0.20-x------------------x-------------x there is a Ka value ...

CHEMISTRY!!!=0
Determine pH of each solution: b) 0.20 M CH3NH3I I did.... CH3NH3^+ +H2O -> CH3NH2 + H3O^+ 0.20 ---------------0--------------0 0.20-x--------------x------------x so i got... ? =x^2/0.20-x i looked up in the back of the book and found the Kb of CH3NH2 to be 4.4 X 10^-4. do ...

AP CHEMISTRY
He got 62.5ml by making up a certain amount of volume for the 0.1M solution and setting it equal to the 0.08 NaOH( which is used to titrate the solution) and determined the amount of NaOH in milliliters needed until the solution hit its endpoint basically he used... M1 x V1 = ...

CHEMISTRY!!!=0
Determine the pH of each solution: (a) 0.10 M NH4Cl can someone show me how to do this one so i have the idea of how to do the rest. thanks!

Chemistry
Determine the Concentration of OH^-1 and pH of a solution that is 0.140 M F^-1. I did F- +H20 ---> HF + H20 but idk what to solve from there....

Psychology
my answers match up with your answers!!! :)

Chidren,Families,and Society
he has probably had a very violent family life, even though he is young, he might have picked up on family fights or feuds that have gotten ugly. he may be abused or he may have pre-k students bullying him. he could possibly have an anger management disorder.

law
Im not sure about elementary. child abuse maybe. In middle schools around here there are alot of drug sells and alcohol too. also a few bullying situations that lead to suicide, not sure how that helps. High school: drug abuse, alcohol abuse, underage drinking, domestic ...

eng 22
i would definitely go with paying attention to what the film has to say. Just my opinion though

algebra
no, she does not have enough. the shoes are $88 with the discount. so she needs $8. To figure this out, divide $132 by 3. multiply that by two and then you have the cost of the shoes.

law
i do not think that she should be able to obtain money from this. as the article says, she mislead investigators which is a serious federal offense. she is lucky that is the only consequences she got. she should be in jail or paying a fine.

Last Chemistry Question!
Yeah i got tht. I hope to make a difference in life some day like you are. Just not a teacher lol. i cnt handle bad kids. haha well ima let you get back to helping. Bye

Last Chemistry Question!
oh thts awesome! Thank you so much for all the help tonight. You Rock Dr Bob!!! :)

Last Chemistry Question!
lol anyone who can help me in any way, that person is my hero! So are you a real doctor? just curious lol!!! :)

Last Chemistry Question!
Awesome thanx man! u r my vertual hero!

Last Chemistry Question!
My teacher told me something about 22.4 liters. do you know what she was talking about?

Last Chemistry Question!
How do you Convert from Moles to Liters? Man i hate not understanding test prep material!

Chemistry
im almost positive that Kemo-Therapy for cancer treatment uses Radioactivity

Chemistry
X-rays

Chemistry
Thank you so much DrBob222

Chemistry
How many particles are in .169 moles of Potassium Sulfide?! What is the percent composition of sulfer in that same prolem?!

Chemistry
uhhh, chemical right?

y no one anwering my ques
oh my bad. sorry. biology was always tough for me

y no one anwering my ques
i believe the answer is #1

writing
hires sounds a little awkward. i think hirees should be placed in there instead of hires

Geometry
25.5 i think

Chemistry
thanx bunches!!! @(^_^)@

Chemistry
How many moles are in 12.0 grams of Potassium Sulfide?

Science n math
What is the molecular geometry n the electron domain for HCN

Math
An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

Math
An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

Chemistry
THE RATE LAW FOR THE REACTION 2NO + 02 = 2NO2 IS FIRST ORDER IN OXYGEN AND SECOND ORDER IN NO. PROPOSE A MECHANISM IN WHICH EACH STEP IS BIMOLECULAR. SPECIFY THE SLOW STEP. I HAVE NO IDEA WHAT TI DO. HELP PLEASE? THANKS.

Math
He would have gotten 10 free.

Chemistry
2 HCl react with 1 Zinc Single replacement rxn So 2.

Calc
I think.... A) -12 B) 1 C)-7

Chemistry
An 8.00 mass % aqueous solution of ammonia has a density of 0.9651g/ml. Calculate the molality, molarity, and mole fraction of NH3. This question seems simple but I cannot seem to remember how to do this. Help please?

chem
An industrial chemist is studying smAll organic compounds for their potential use as an auto antifreeze. When 0.243g of a compound is dissolved in 25.0 ml of water, the freezing point is -0.201 degree celcius. (A) Calculate the molar mass of compound (dH2O= 1.00g/ml) at temp ...

trig
Basically the arcsin is the same as sin^-1 so the sin^-1(.5)= 30 degrees You can use a unit circle or a 30-60-90 triangle to figure it out.

trig
How do i solve this equation over the interval [0degrees,360) cot(theta)+2csc(theta)=5

math (taylor polynomials)
Find the degree 3 Taylor polynomial T3(x) of the function f(x)=(7x+50)4/3 at a=2 Find the second-degree Taylor polynomial for f(x)=4x2−7x+6 about x=0 thank you! (:

Math (linear approximation)
Find a linear approximation of the function f(x)=(1+x)^(1/4) at a=1, and use it to approximate the numbers (.95)^(1/4) and (1.1)^(1/4). Round your answers to the nearest thousandth Cheers in advance!

CHEM
Compare the value you obtained from average bond energies: (260Kj) to the actual standard enthalpy of formation of gaseous benzene, 82.9 kj. What does the difference between these two values tell you about the stability of benzene?

MATH
You can plug in zero for x and solve for y. then plug in zero for y and solve for x to get your values for x and y. x=200 y=-100

Further calculus
1) A price p (in dollars) and demand x for a product are related by 2x^2+6xp+50p^2=10600. If the price is increasing at a rate of 4 dollars per month when the price is 30 dollars, find the rate of change of the demand. 2) a) The price (in dollars) p and the quantity demanded q...

Calculus
sorry accidentally reposted!!

Calculus
Answers to any of these questions would be of great help! (: 1 a) At noon, ship A is 150km west of ship B. Ship A is sailing south at 50km/h and ship B is sailing north at 30km/h. How fast is the distance between the ships changing at 4:00pm? b) A spotlight on the ground is ...

Calculus
thank you steve!

Calculus
Answers to any of these questions would be of great help! (: 1 a) At noon, ship A is 150km west of ship B. Ship A is sailing south at 50km/h and ship B is sailing north at 30km/h. How fast is the distance between the ships changing at 4:00pm? b) A spotlight on the ground is ...

graphing
Can someone explain what quadrant this would be in and the domain and range. I have no idea how to graph it. G(x)= -3sin^-1 (2x)

Trigonometry
Oh okay thanks!

Trigonometry
Write as an algebraic expression in u. Tan(cos^-1 u)

MATH
-8. Plug in -6 for x and solve.

Quantatative Analysis
Use M1V2=M2V2 Plug in your given molarity and volume and solve for V1.

Trigonometry
Oh okay thanks a lot:) I was distributing sec and couldn't' get anywhere. I didn't think of writing it like that.

Trigonometry
Prove identity. Sec(pi-x)=-sec x

TRIG
Verify the following identity. 1) sin(x+y) __________ = tanx+tany cosxcosy 2) Write cos3x in terms of cosx I cannot figure out how to solve for identities they are so hard. Any help appreciated!:)

Chemistry 105
Use Boyles Law. P1V1=P2V2 (33.0L)(1.1atm)=(P2)(10.0L) and solve for P2.

TRIG
1) Find an angle that makes the statement true: costheta =sin(3theta+10degrees) 2) Verify this proof: sec(Pie -x)= -secx Can someone show me how to solve for these. Very much appreciated!

chemistry 105
Use the ideal gas law.. PV=nRT and solve for moles of N2 SO.... (1.00atm)(.0599L)=n(0.0821L*atm/mol*K)(273K) solve for n. then use "n" moles of N2 and then set up an conversion factor. so.... ___moles of N2 x( 6mol Li/2mol N2) x (MolarMass Li/1mol of Li) Then that ...

math2 calc
Let f(x) be the function 11x2−9x+7. Then the quotient f(6+h)−f(6)h can be simplified to ah+b for: a= and b=

Math- calculus
Suppose f is a function which satisfies the properties: f(x+y)=f(x)+f(y)+x2y+xy2 for all real numbers x and y, and limx→0f(x)x=1. f′(x) thanks in advance!

chem
A student placed 12.0grams of glucose in a flask added enough water to dissolve glucose by swirling then added additional water until the .100 ml mark. A 60.0ml sample of this glucose soon was diluted to 0.500 L. How many grams of glucose are in 100. ml of the final solution.

DRAMA
Tragedy- the fall of a tragic hero Comedy- funny based on words

trig
Given the radius of a wheel is 12inches and the angular speed is measured to be 3pie/4 radiant per second, find the linear speed of the piece of gum stuck to the where. Give both an exact answer. And a decimal answer rounded to 4 decimal places.

trig
An automobile windshield washer 10inches long rotates an angle of 60degrres. If the rubber part of the blade only covers the last 9inches of the wiped, find the area of the windshield cleaned by the wiper.

Chemistry - - Hydrocarbons
oh then when you number your chain. CH is number 3. SO you would call the organic compound..... 3-MethylHexane

Chemistry - - Hydrocarbons
you count the longest chain so it will be the carbon chain of six. so hexane and then you have CH3 attached so it would be MethylHexane i believe.

Chemistry 1
the answer is 13180. you do what is in parenthesis first and round it 3sf and get 3770 and then add 9413.4... and then round to least number of decimal places so you would get 13180

Trig
how do i find the exact value of s [pie/2, pie] sin s = radical2/ whole number 2 what is s in radians? how do i figure this out without the use of a calculator. I drew the graph and located it in the second quadrant and i think the triangle is a 45-45-90 but i don't how to...

chemistry
combustion analysis of a hydrocarbon produced: 33.01 g CO2 and 13.51 g H2O Calculate the empirical formula of the Hydrocarbon. I got CH5 but that doesn't seem right? how do i do this problem?

Chemistry
well you have dipole-dipole London Dispersion and hydrogen bonds. you just classify which forces each are by reading your definitions of the three. LD are the weakest forces Hydrogen bonds are when two hydrogen bond with one another which is strong dp-dp forces are between one...

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