Wednesday

April 16, 2014

April 16, 2014

Total # Posts: 68,080

**Math**

How do graph the parent quadratic function on calculator? I need some assistance so I can start my Hw. I have a TI-83 pus calculator

**Physics**

An electromagnetic wave has a frequency of 2.04 x 10^12 Hz, What is the wavelength of this EM wave?

**SCIENCE **

1. Multiple choice: why is it uncommon to draw lewis diagrams for ionic compounds? A.) Lewis diagrams can only illustrate covalent bonding B.) ionic compounds cannot be represented by Lewis diagrams C.) ionic compounds involve electron transfer not electron sharing d.) formula...

**Sportsmanship**

Thanks! That helps.

**Sportsmanship**

Would hitting a badminton racquet on the ground be an example of bad sportsmanship?

**math**

I got 11.76?

**math**

What will be the cost of 275 bags of sugar containing 98 pounds each at $0.12 a pound?

**math**

Mr. Willams recieves an annual salary of $54,000. What is his average monthly salary?

**math**

I got $11.76? I am sorry if its wrong because I am not that great in math skills :/

**math**

Ms. M is buying a 6 pound roast at $1.05 a pound. What will her change be from a ten dollar bill?

**MATH HELP**

In desperate need of help! solve by factoring. 1. x^2=-25+10x 2. 2x^2+9x=5 3. The length of a square is 4x-3. Find the area in terms of x.

**Math- please help!!!**

please help me solve these problems! Thank you! 1. Simplify: (3p^5)(5p^2)+(7p^3)(2p^4) 2. Simplify: (6x^2-2xy+3y^2)-(4x^2-xy-y^2)

**pre-calc**

3-log(x+2)=5

**research**

where can I find information on actuarial prediction of sex offense recidivism and why it is important.

**math**

Jeff is repairing his sleeping tent. After measuring he find he needs 90 inches of new canvas. What will it cost at $1.88 a yard?

**math**

William helped his father pack 1000 tomato plants. He put 25 plants in a box. They sold them for $2.25 a box. How much did they recieve for the plants?

**math**

I paid $8.10 for a 6 pound roast. How much a pound did I pay?

**math**

So Mr. White earns $95.58?

**math**

Mr. white, a carpenter, has worked 40 1/2 hours jn repairing a house. At $23.60 an hour, how much has he earned?

**Science URGENT!!!**

Mulitple choice: why is it uncommon to draw lewis diagrams for ionic compounds? A.) Lewis diagrams can only illustrate covalent bonding B.) ionic compounds cannot be represented by Lewis diagrams C.) ionic compounds involve electron transfer not electron sharing d.) formulas f...

**Chemistry**

The mechanism for NH2NO2=N2O+H2O occurs in three steps: step 1: NH2NO2=NHNO2- + H+ (forward and reverse reactions are fast) step 2: NHNO2-=N2O+OH- (slow) step 3: H+ + OH-=H20 (very fast) What is the rate law for d[N2O]/dt as determined by the mechanism?

**Math Help**

In desperate need of help! solve by factoring. 1. x^2=-25+10x 2. 2x^2+9x=5 3. The length of a square is 4x-3. Find the area in terms of x.

**Quick math help**

please help me solve these problems! Thank you! 1. Simplify: (3p^5)(5p^2)+(7p^3)(2p^4) 2. Simplify: (6x^2-2xy+3y^2)-(4x^2-xy-y^2)

**Chemistry**

500 ml of a buffer solution with ph=2.10 must be prepared using .4 M HNO2 and solid KNO2. The ka value of HNO2 is 4e-3. a.) What mass of KNO2 should be added to 3 L of the HNO2 to make the buffer? b.) What is the buffer's pH after 150 ml of .5 M HNO3 is added?

**Economics problem HELP!!!**

Can someone please help me with a hint to solve this problem?? I'm struggling really hard with this. Thanks!!! "Consider an oligopolistic market with two firms. Each of them produces using a cost function given by c(q)=q^2. The aggregate demand in the market is given ...

**Chemistry**

Yes the compound is C(sub 60)O(sub 3). Sorry, the Arrenhnius stuff was to solve part a to find the k value and I understood that so I just added what I found for k. I thought you are supposed to use the equation, concentration of A equals initial concentration of A times e^(-k...

**Chemistry**

A sample of C60O3 decomposes with an activation energy of 50 kg/mol, an Arrehnius pre-factor of 2e10 s-1 and a k value of .04 s-1. How long does it take for a 25 mg sample at 25 degrees C to produce 10 mg.

**Physics**

how do u find u1?

**Physics**

That's wrong

**research**

where can I find information on this topic

**research**

Explain why actuarial prediction of sex offense recidivism is considered important.

**TO: DrBob222 science**

1. Write the chemical formula for each of the following acids: a.) hydrocyanic acid b.) oxalic acid c.) chlorous acid d.) nitric acid 2. Write the acid name or chemical formula for each of the following: a.) HBr b.) sulfurous acid c.) HClO4 D.) phosphoric acid 3. First classif...

**chemistry**

Cabbage Juice Titration Lab connexus

**TO: DrBob222 science help**

You are a lifesaver! Thank u so much !

**TO: DrBob222 science help**

1. with respect to ion count, why is water considered to be neutral? 2. How do the number of H+ and OH- ions compare after a.) HI is added to water? b.)KBr is added to water? c.)KOH is added to water? 3. Give the Arrhenius definitions for salts.

**Science**

5. Which of the following types of pollution cannot be attributed to car and truck emissions? A. acid rain B. sedimentation C. ozone D. photochemical smog 6. Which of the following is a source of photochemical smog? A. fossil fuels B. wind energy C. biomass fuels D. nuclear en...

**Physics**

thanks!

**Physics**

In a lightning bolt, a large amount of charge flows during a time of 2.2 10-3 s. Assume that the bolt can be treated as a long, straight line of current. At a perpendicular distance of 28 m from the bolt, a magnetic field of 7.3 10-5 T is measured. How much charge has flowed d...

**Physics**

thank you so much!!!

**Physics**

I figured out the right equation. It is B=mu*n*I but I still don't know how to figure out what I is

**Physics**

to calculate turns/length, would it be N/R = 2B/mu*I? but then what is my I value? or am I going about this the completely wrong way?

**Physics**

A solenoid is formed by winding 25.3 m of insulated silver wire around a hollow cylinder. The turns are wound as closely as possible without overlapping, and the insulating coat on the wire is negligibly thin. When the solenoid is connected to an ideal (no internal resistance)...

**Math**

Oh, okay. Thanks!

**Math**

The answer key says 3+-square root 3

**Math**

How to tell how many solutions c^2 - 18 = 9 in mental math?

**world geography**

What impact did the dissolution of the Union of Soviet Socialist Republics have?

**chemistry**

Calculate the percent yield for an experiment in which 46.9 g of SO3 was produced upon the reaction of 51.2 g of SO2 with 25.0 g O2

**Math HELP!! Who can solve??**

I suggest you give them sample values to find the answer.

**physics**

21.74

**PLEASE HELP!!computer science**

I'm trying to write a program for this piece wise function using CPU sim.its really argent... f(n) = n^5 (n<0) 10 (n=0) n^2 -2n +5 (n>0) i have worte this program bust still give error on cpu simulator.. please can you help me correct this error. Start: read 0 ; read...

**TO DrBob222 Science**

Also what would the pH value for grapefruit juice be? (>7, 7, or <7)

**TO DrBob222 Science**

1. with respect to ion count, why is water considered to be neutral? 2. How do the number of H+ and OH- ions compare after a.) HI is added to water? b.)KBr is added to water? c.)KOH is added to water? 3. Give the Arrhenius definitions for salts. Thanks :)

**chemistry**

A gas mixture contains 75.2% nitrogen and 24.8% krypton by mass. What is the partial pressure of krypton in the mixture if the total pressure is 853mmHg ?

**Chemistry**

A heliox deep-sea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium.What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.9atm ?

**geometry**

Marta is standing 4ft. Behind a fence 6 inches tall. When she looks over the fence, she can just. See the top of a building. She knows that the building is 32 ft. 6 inches behind the fence. Her eyes are 5 ft. From the ground. How tall is the building?

**statistics**

If boys and girls are equally likely and groups 400 births are randomly selected find the standard deviation

**Algebra **

Find the equation of the parabola with its vertex at (h,k). Vertex: (-2.1) Focus: (-5,1) I know I put it into (y-k)^2=4(p)(x-h) so (y-1)^2=4(p)(x+2). How do I find the value of p?

**Algebra **

Find the equation of the parabola with its vertex at (h,k). Vertex: (-2.1) Focus: (-5,1) I know I put it into (y-k)^2=4(p)(x-h) so (y-1)^2=4(p)(x+2). How do I find the value of p?

**Description**

Thank you.

**Description**

Which of the following sentences are considered as a description of the terms "active voice" and "passive voice"? "Sentences written in the active voice are often less wordy and more direct than those written in the passive voice." Or "A verb...

**trig**

okay, thanks!

**trig**

I have an equation that is 3tan2x=3 and the solution is x=pi/12 + npi/3 and another equation that is 2tanx-2=0 , the answer sheet says the solution is x=5pi/4. why is the npi not added to the second solution but it is on the first?

**trig**

cos/sin use 2npi and tan uses npi, but how do you know when to add 2npi or npi to the solution of the equation?

**A Peculiar Question**

Alright. However, in your own opinion as a teacher, would you consider these grades to be terrible?

**A Peculiar Question**

Is either a B+ or an A- considered a terrible grade? If I received a B+ for two essays that I was assigned and then an A- for another, will these grades ultimately cause a decrease in my GPA? I want to enter into either a film or art college, and I want to retain my 4.0 GPA wh...

**Chemistry**

How do you find the initial concentration of the acid give the titration curve of a weak acid-strong base titration?

**Chemistry **

Calculate the pH of the solution that results from mixing 30.0 mL of 0.050 M HCN(aq) with 70.0 mL of 0.030 M NaCN.

**math**

there are 18 boys in a class. there are W less boys than girls. How many students are in the class?

**Physics!**

Yes he's a Professor , I'm stumped and have no clue whats he asking.

**Physics!**

Consider someone in a rotating space habitat. The outward force felt by the person A.has no reaction counterpart B.is an interaction with Earth C.is a form of gravity D.is real in the traditional sense

**Math**

how do you use the quadratic formula on a TI-83 calculator? I'm in algebra 1!

**uta**

the acidity constant of acetic acid is 1.8 x 10^-5. Calculate the % error of the measured Ka value of 1.82 x 10^-5

**Science URGENT PLEASE**

Thank u so much :)

**Science URGENT PLEASE**

1. what would you expect the pH value for grapefruit juice to be? (>7, 7, <7) 2. A.) Which two ions are present in very small amounts in any sample of pure water? b.) what is a good alternative chemical formula for water rather than H2O? Why? c.) with respect to ion coun...

**math**

What is 11.11

**Chemistry**

Calculate the change in mass of the In electrode after the cell supplies 100 mA of current for 10 minutes. The balanced redox reaction is 2In+Cl2=2In+ + 2Cl-. I understand the idea behind the question, I just don't know if I should use 1 mol In per 1 mol e- or 1 mol In per...

**Science question, only 1**

What would be the consequence of an ecosystem that had no nitrogen-fixing bacteria? Nitrogen from decomposing animals would never be returned to the soil. Decomposers would not be able to break down the nitrogen present in plants they feed on. Plants would have to rely on biol...

**Chemistry**

Why do you divide .01 by 2. Shouldn't you divide by 1 because 50 ml+50ml=1L

**Chemistry**

The reaction OH- + NH4+ = H20 + NH3 is kinetically first order in both reactants' concentrations. The rate constant is 2e10 1/M s. If 50 ml of .01 M NaOH is mixed with 50 ml of .01 M NH4CL, find the time required for the OH- concentration to reach 1e-4 M.

**Chemistry**

A saturated solution of MgF2 at 23 degrees C was prepared by dissolving solid MgF2 in 1 L water. The Ksp of MgF2 is 1.5e-5. a.)Calculate the mass of MgF2 dissolved. b.) When .1 mols of solid KF was dissolved in the MgF2 solution, precipitation was observed. Find the mass of th...

**us history**

Would 7 be slavery? and 9 be, many gains were made in the area of women's education during this period?

**us history**

Hello! Can you please help me?? 1. In the 1800s, there was a wave of religious fervor known as the () Religious Right. (x) Second Great Awakening. () Religious Awakening. () Revival Times. 2. What movement called for drinking little or no alcohol? () Transcendentalist () utopi...

**english**

maria is doing caca .

**english**

the essay is about someone who has no privacy and the thesis statement is something like "i wish people respected my privacy." i dont really know how to start off my introductory paragraph.

**english**

how would you start off an essay that is about the lack of privacy you have? (has to be in first person)

**science help pleasee**

isn't it also ionic bonds too with the hydrogen ions? i dont really understand it

**science help pleasee**

what type of bonding is phosphoric acid?

**A Peculiar Question**

If I have been given a B+ for two essays, it is considered a terrible grade? Will it affect my report card?

**Puncuation**

Am I supposed to write the definition, pronunciation, and part of speech of the word "bliss" like this? Bliss /blis/ (noun): perfect happiness; great joy.

**chemistry**

a gas with a volume of 4.00 L at pressure of 205kPa is allowed to expand to a volume of 12.0L. what is the pressure in the container if the temp remains constant

**Grammar**

What is the part of speech of the word "bliss"?

**Geography Answer Evaluation (Ms. Sue) **

Which four seas border Italy? My answer: The Adriatic, Ionian, Ligurian, and Tyrrhenian Seas border Italy.

**Algebra Based Physics **

A 2.50-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.224 s, what is the average force ex...

**biology**

hi ms sue its me Anthony

**biology**

that isn't an option, but would flowchart be kind of close to a circle graph?

**biology**

What graphic could you use to best show the checkpoints in the cell cycle? a. line graph b. bar graph c. flowchart d. map I'm not sure, I think it's c?

**Grammar**

Should "a Happy Birthday" not be capitalized?

**Grammar **

Is this sentence grammaratically correct? "Although I already wished you one at Seminary this morning, I still hope you have a Happy Birthday."

**physics**

A cylinder floats with its volume 3 cubic metre inside water. What is its total volume if its density 100 kg per cubic metre? Density of water is 1000 kg per cubic metre

**SCIENCE 1 QUESTION PLS HELP!!!!!**

C

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