Thursday
October 2, 2014

# Posts by SARA

Total # Posts: 3,678

CALCULUS-plz help!
For the curve r = 2 sin 3(theta): Find the arc length of one petal
April 16, 2013

Math
I think I figure it out. The answer is: 12 A ^2 * 2 A * - 31 + 4 A * 6 + / I figured that that the square sign and the number 2 count as one operator. For ^2 I just use the x^2 button on the calculator and it gave me the same answers.
April 15, 2013

Math
I need to change this expression to postfix form. (12*A^2-2*A+31)/(4*A+6) I know how to do this except for the squaring part. I got stuck. This is my try. 12 A 2 ^ * 2 A * - 31 + 4 A * 6 + / When I test this in a calculator, it gives different results. Another problem is that ...
April 15, 2013

biology
i am researching an article and am having trouble understanding the title. can someone please explain to me in simple terms: Deficiency of a Beta-arrestin-2 signal complex contributes to insulin resistance. so what is a beta arrestin 2 signal complex?
April 15, 2013

Chemistry
radioactive sodium chloride is appropriate for diagnosing circulatory problems, but radioactive xenon is helpful in searching for lung problems. Explain why. I understand different elements are used for specific parts of the body but I don't understand this question. ...
April 14, 2013

physics
A 22.0 Ω, 11.0 Ω, and 6.00 Ω resistor are connected in parallel to an emf source. A current of 6.00 A is in the 11.0 Ω resistor.What is the potential diﬀerence across the source? Answer in units of V
April 14, 2013

commerce
April 14, 2013

physics
An 8.0 Ω resistor and a 4.0 Ω resistor are connected in series with a battery. The potential diﬀerence across the 4.0 Ω resistor is measured as 9 V. Find the potential diﬀerence across the battery.
April 14, 2013

chemistry
A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume of household bleach that should be diluted with water to make 500.0 mL of a pH = 10.23 solution.
April 10, 2013

chemistry
The Ka of a monoprotic weak acid is 7.25 × 10-3. What is the percent ionization of a 0.167 M solution of this acid? If the concentration is more than 1000 times greater than the Ka, then you can make an assumption that simplifies the algebra needed to solve the problem. ...
April 10, 2013

chemistry
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted. If 0.460 moles of a monoprotic weak acid (Ka = 3.8 × 10-5) is titrated with NaOH, what is ...
April 10, 2013

chemistry
A flask contains 0.342 g of acid and a few drops of phenolphthalein indicator dissolved in water. The buret contains 0.120 M NaOH. 20.f mL of base is needed to reach the endpoint of the titration. Assuming that the acid is monoprotic, what is the molar mass?
April 10, 2013

childhood edu
One of Rudolph Dreikur's contributions to the field of early childhood education is his belief that? A. All behavior is goal directed. B.There's a difference between behavior and misbehavior I think it's A,am I correct
April 9, 2013

math
solve the problem A drug is injected into a patient and the concentration of the drug is monitored. The drug's concentration, C(t), in milligrams after t hours is modeled by C(t) = (7t)/2t^2+4.
April 7, 2013

epidemiology
Let’s say you are a health policy expert and you are sitting in your office and you receive a phone call from a news reporter. The reporter asks you to comment for a story she is writing. She has learned from the chief of neurosurgery at Cooper University Hospital that ...
April 5, 2013

epidemiology
In a study examining associations between level of education and response to the Philadelphia Public Health Department’s emergency messages to “shelter in place” (meaning stay in your home) following an accidental release of chemicals from the Sunoco refinery in...
April 5, 2013

epidemiology
) In a recently published article authors reported on their research examining the effectiveness of compound C-4277, an anti-viral agent. This agent was tested to determine its impact on rhinoviruses, which are the leading cause of common colds. The article states that 1,800 ...
April 5, 2013

chemistry
I mean the head temp. is the higher temp., they called it like this in my university. anyway,this question in the dehydration of cyclohexanol. when we do elimination the heat temp. should be kept below 90 c, why?
March 30, 2013

chemistry
why is the head temperature kept below 90 c in the initial step of the dehydration reaction?
March 30, 2013

Calculus-PLZ HELP! =)
does the sum 3/(2^(n)-1) converge or diverge? n=1--->infinity
March 26, 2013

Calculus II
Is the series 1/(n(n+1)) convergent? n=2 to n=infinity
March 25, 2013

Calculus II
Does 3/(2^(n) +1) diverge or converge in an infinite sum?
March 25, 2013

Chemistry
Nvm figured it out
March 22, 2013

Chemistry
Why is the last step is convert to pH? We are trying to find the hydroxide-ion concentration?not the pH
March 22, 2013

Chemistry
what is the hydronium-ion concentration in a 0.35m solution of NaCO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11. (Kw=1.0x10^-14)
March 22, 2013

Chemistry
I don't press the E button i press the 10^x Button but when I divided the kw/Kb it gives me 2.083x10^-28
March 22, 2013

Chemistry
I plug in the numbers put it doesn't match any of the choices.... I get 4.81x10^-29 The choices are A)2.3x10^-35 B)6.4x10^-23 C)7.3x10^-16 D)48 E)491 Please help!!
March 22, 2013

Chemistry
What is Kc for the following equilibrium? For phosphoric acid, Ka1=6.9x10^-3, Ka2=6.2x10^-8 and Ka3=4.8x10^-13 HPO4^-2 + OH^- <==> PO4^-3 + H2O
March 22, 2013

physics
Calculate the magnitude of the gravitational force between the Earth and an m = 6.00 kg mass on the surface of the Earth. The distance to the center of the Earth from the surface is 6.37×103 km and the mass of the Earth is 5.98×1024 kg. B)Calculate the magnitude of...
March 22, 2013

english
complete the sentence please! a kite___ tries to catch a falling kite before it lands.
March 21, 2013

chemistry
How many mL of 0.40M NaOH are need to neutralize 30.0 mL of 0.50 M H2SO4 according to the following reaction. 2NaOH(aq) + H2SO4 (aq)----Na2SO4 (aq) + 2H2O(l)
March 20, 2013

English
Which senses are appealed to in these lines from Macbeth? Nay, had I pow'r, I should / Pour the sweet milk of concord into hell, / Uproar the universal peace… A. smell, taste, and touch B. hearing, sight, and smell C. sight, taste, and hearing D. hearing, taste, and ...
March 20, 2013

Childhood
Thanks :)))
March 19, 2013

Childhood
Two most common aspects of malnutrition in the u.s are: a) heart disease and obesity b) iron deficiency and heart disease c) dental decay and iron deficiency d) obesity and dental decay. I chose c) dental and iron deficiency is that right?
March 19, 2013

curriculum development
I'm using notes and Internet not text, I can't find much info
March 19, 2013

Childhood
The fundamental purpose of early childhood education should be to a) prepare children for continuing later success in elementary school. B) foster growth of developmental sequences c) foster competence in dealing with life .is letter c) correct?
March 19, 2013

Chemistry
I could use some help please. Ammmonia, NH3, can be made by reacting Nitrogen with Hydrogen. N2+3H2=2NH3 How many moles of NH3 can be made if 7.5 moles of H2 react eith enough N2? Thank-you in advance for any help
March 18, 2013

College algebra
Find the value of f(x) = -3x^2 + 12x-8
March 15, 2013

Find the following inequality
Find the following inequality. 15(x^2-1)>16x
March 15, 2013

accounting
13. A drawback to using _______ when inventory costs are rising is that the company reports lower net income. A. LIFO B. FIFO C. specific-identification costing D. average costing 14. The balance sheet format that lists assets
March 12, 2013

Math
what is a model that shows 180 divided by 9
March 11, 2013

MATH
There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is "D", the distance from the top of the slide to the ground? Explain how you got your answer.
March 10, 2013

math
There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is "D", the distance from the top of the slide to the ground? Explain how you got your answer.
March 10, 2013

math
2x+3y=13 5x+2y=16
March 10, 2013

Math
If you have 36ft of fencing what are the areas of the different rectangles you could enclose with the fencing? Consider only whole number dimensions.
March 7, 2013

chem
Calculate the pH of a solution made by adding 3.20 g of lithium oxide (Li2O) to enough water to make 1.210 L of solution. (Kw = 1.0 10-14)
March 7, 2013

chemistry
i did what you told me to and had to use the quadratic and got 1.430e-6 for the OH- but it was wrong. is that what you got?
March 6, 2013

chemistry
Calculate the hydronium ion concentration and pH in a 0.037 M solution of sodium formate, NaHCO2. hydronium ion concentration i dont understand these
March 6, 2013

chem
select the stronger base. how do i know this? 1.SeO42− or SO42− 2.BrO− or BrO2−
March 6, 2013

physics
Jacob found a piece of a broken glass bottle. He picked it up and made these observations about it: 1. No color (clear) 2. Makes scratches on wood 3. Has a bumpy surface 4. Broke when I dropped it He thinks the glass is a solid and most of his observations could only apply to ...
March 5, 2013

physics
Jacob found a piece of a broken glass bottle. He picked it up and made these observations about it: 1. No color (clear) 2. Makes scratches on wood 3. Has a bumpy surface 4. Broke when I dropped it He thinks the glass is a solid and most of his observations could only apply to ...
March 5, 2013

Physics
A 1200.0-kg car speeds up from 16.0 m/s to 20.0 m/s. How much work was done on the car to increase its speed?
March 5, 2013

chemistry
Calculate the molar concentration of OH− ions in an 1.79 M solution of hypobromite ion (BrO−; Kb = 4.0 10-6).
March 4, 2013

Math...I think...
A building casts a shadow 54 feet long at the same time a 6 foot tall man casts a shadow 4 feet long. How tall is the tree?
March 1, 2013

Finance
CAN SOMEONE PLEASE PLEASE HELP ME WITH A FINANCE QUESTION THAT I POSTED YESTERDAY,WEDNESDAY,FEB 27TH @ 5:58PM.PLAEASE,ANY AND ALL HELP WILL BE GREATLY APPRECIATED
February 28, 2013

physics
a chinook salmon
February 28, 2013

physics
a moving walkway at an airport has a speed v1 and a length l. a woman stands on the walkway as it moves while the man in a hurry to reach his flight walks on the walkway with a speed of v2 relative to the moving walkway. how long does it take the woman to travel the distance l.
February 28, 2013

social studies
what injuries did they get in the lowell Massachusetts textile mills ? what did the implorers do about it ?
February 27, 2013

Finance
Please help me,math word problems make my brain go crazy. Some friends are urging you to chip in with them to buy a vacant parcel og land on the outskirts of your city. A one-fourth interest would cost you \$10,000.Total annual expenses on the property are \$2,200.When the ...
February 27, 2013

statistic
At a party there are 33 students over age 21 and 22 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol.. You have given every student at the party the same chance to be ...
February 27, 2013

o.chem
how would doubling the concentration of the nucleophile affect the rate of an sn2 reaction?
February 26, 2013

calc 2
A computer takes 2 seconds to compute a particular definite integral accurate to 4 decimal places. Approximately how long does it take the computer to get 12 decimal places of accuracy using each of the LEFT, MID, and SIMP rules? Round your answers to one decimal place. (a) ...
February 25, 2013

chemistry
how is it possible for the same element to be oxidized in one reaction and reduced in another?
February 24, 2013

medical physics
Rx = 3000 cGy in 10 fractions, whole brain Rt and Lt laterals, KD Siemens 6x. The collimator is set for 22 X 16 cm2 portal films at 92.5 cm SSD. Calculate the treatment port MU to isocenter. Calibration performed std. SAD; treatment performed SSD (assume SSDs at the calc point...
February 20, 2013

calculus!!!
Find the integral of: 2xsqrt(x+1) dx
February 20, 2013

calculus
Find the integral of: (x+2)/(x^3+2x^2-3x)dx
February 20, 2013

math
If a person runs 5 miles in 1 hour, how far will they run in 5 minutes?
February 19, 2013

math
) The circle graph below gives the inventory of the women's department of a store. Coats \$49,737 Dresses \$47,208 Skirts Lingerie \$9273 \$5058 Slacks Socks \$15,174 Blouses \$2529 \$5901 What is the total inventory?
February 17, 2013

Finance
Would anyone be able to help me out please? You buy 100 shares of XYZ at \$40per share.XYZ pays an annual dividend of \$2 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 yrs and that the stock will increase 5% each...
February 17, 2013

Life orientation
Hi Sello.I worked in management for yrs so I hope this helps you. There is several laws protecting the employee in the work force. 1]The Federal Civil Rights Act of 1964 prohibits employers from discriminating against job seekers and employees on the basis of race,religion,sex...
February 17, 2013

Finance
I've posted this question once already and really need help. You buy 100 shares of XYZ at \$40 per share.XZ pays an annual dividend of \$2.00 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 years and that the ...
February 15, 2013

Financial
You buy 100 shares of XYZ at \$40 per share.XYZ pays an annual dividend of \$2 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 years and that the stock will increase 5% each year.How much will your XYZ investment ...
February 14, 2013

Chemistry
The solubility of nitrogen in water is 6.9 x 10^-4 at exactly 1 atm pressure. What is the solubility of nitrogen under .80 atmp pressure? I don't know where to start with this problem, what formula do I use?
February 13, 2013

chemistry
how would that help trying a new solvent? i dont understand why the recovery would be so poor, do you know?
February 11, 2013

chemistry
a student dissolves 80 mg of a crude product in 4.5 mL( the minimum required) of methanol at 25 deg C . She cools the solution in an ice bath and obtains crystals. The crystals are recovered by filtration and rinsed with 0.5 mL of ice-cold methanol. After drying, the weight of...
February 11, 2013

calculus
Find the integral of (tan x)^2 sec(x)dx
February 11, 2013

calculus
Find the integral of: dx/(x^2-4x)
February 11, 2013

chemistry
I got x= 8.88 g the second extraction you mean the same solve, that means I should do 8.88+8.88= total of z?
February 9, 2013

chemistry
Suppose a compound Z had a partition coefficient of 8.0 in ether-water. If 10.0 g of Z was dissolved in 100 mL of water, and if the water solution was extracted with two 100 mL portions of ether, answer the following questions. show your calculation. a) What is the total ...
February 9, 2013

Chemistry
what conditions are shared by cities that suffer from photochemical smog?
February 6, 2013

1. Question : The purpose of the War Powers Act is to Student Answer: INCORRECT allow the Commander in Chief to issue informal declarations of war. to grant the President unlimited military powers. grant Congress equal military power with the President. CORRECT ensure ...
February 3, 2013

Chemistry
54.0 mL of a 1.50 M solution is diluted to a total volume of 258 mL. A 129-mL portion of that solution is diluted by adding 165 mL of water. What is the final concentration?
February 2, 2013

PHYSICS
Because Earth's rotation is gradually slowing, the length of each day increases: The day at the end of 1.0 century is 1.0 ms longer than the day at the start of the century. In 93 centuries, what is the total (in hours) of the daily increases in time (that is, the sum of ...
February 1, 2013

PHYSICS
Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
February 1, 2013

PHYSICS
During heavy rain, a section of a mountainside measuring 5.4 km horizontally (perpendicular to the slope) 0.80 km up along the slope, and 2.1 m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley ...
February 1, 2013

math
what is formula to show how much time it took car to travel 7km is .4hrs
January 30, 2013

medical transcription 2
I need help finding an answer in the Diagnostic imaging/interventional radiology TE #13, which is MRI brain for Edgar jorda. The part where it says: "The ________ appears minimally changed from the study..."
January 24, 2013

Physics
Q1 and Q2 are charged objects of the same sign separated by a distance 29.9 m. If you place another charged object (Q3) a distance 8.0 m from Q2 along a direct line between Q1 and Q2, it experiences no net electric field. So, if the magnitude of Q2 = 9.3 C, what is the ...
January 23, 2013

physics
In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 × 10−27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far from the ...
January 23, 2013

Math
This table gives the number of AIDS cases reported in men in Los Angeles from 1983-1989: Month and Year of Diagnosis AIDS cases reported in period Jan-June 83 116 July-Dec 83 154 Jan-June 84 197 July Dec 84 269 Jan-June 85 415 July-Dec 85 503 Jan-June 86 668 July-Dec 86 773 ...
January 23, 2013

math
What are the basic elements of an effective medical office financial policy?
January 23, 2013

chem
for 2Al2O3----> 4Al(s) + 3O2 the question is what is the heat change for the formation of 1 mol of aluminum oxide from its elements? Al2O3:-1676.0 O2:0.0 Can someone please explain how to complete this problem step by step please??
January 22, 2013

Math
Write an equation: x varies directly as y and inversly directly to the cube of Z
January 21, 2013

Health
Thank you so very much. These websites are a great help to me.
January 19, 2013

Health
I have to create a nursing case study. I have everything I need, but am not sure how to present it. Details: 67 year old causcasain male diagnosed with emphysema returns with shortness of breath, etc. supposedly associated with CHF. Have to have everything including ABCD ...
January 19, 2013

Chemistry
A steel tank at 300 K contains 0.285 L of gas at 1.92 atm pressure. The tank is capable of withstanding a maximum pressure of 5.76 atm. Assuming that doubling the kelvin temperature causes the internal pressure to double, a. at what temperature will the tank burst? b. will it ...
January 16, 2013

Chemistry
A steel tank at 300 K contains 0.285 L of gas at 1.92 atm pressure. The tank is capable of withstanding a maximum pressure of 5.76 atm. Assuming that doubling the kelvin temperature causes the internal pressure to double, a. at what temperature will the tank burst? b. will it ...
January 16, 2013

Chemistry
I'm supposed to compare the percent composition of gases in the atmosphere at sea level to the percent composition at high altitude.. Would the percents decrease? I don't really understand
January 16, 2013

Chemistry
explain why a sealed bag of potato chips "puffs out" (increases in volume) if taken from sea level to a high mountain pass. I know this has to do with pressure.. so is it because the higher up you go, the less pressure there is? Thanks!
January 16, 2013

bio
The most common protein secondary structures (the alpha helix and beta conformation) are stabilized primarily by A. ionic bonds B. hydrogen bonds C. disulfide bonds D. van der Waals interactions E. hydrophobic interactions
January 16, 2013

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