Saturday

February 28, 2015

February 28, 2015

Total # Posts: 2,118

**chemistry**

SciMann Best Answer - Chosen by Voters Let UNITs guide you; always USE THEM in your calculation to prevent errors moles of Na in samp = 0.78 g/ atwt Na = ?? x moles NaBr * MW NaBr + (moles Na - x moles NaBr) * MW NaCl = 2.01 g x moles NaBr = [2.01 g - moles Na * MW NaCl] / [MW...
*July 26, 2012*

**algebra***

Find the following product: -9x^5y(-5x^4y^6) A)-14x^9y^7 B)45x^9y^7 C)-9x^5y-5x^4y^6 D)45x^20y^6
*July 26, 2012*

**Algebra**

Divide and check: (3x^2-2x-13)divided by (x-2)
*July 24, 2012*

**algebra**

Lunc Capacity: The polynomial 0.041h-0.018A-2.69 can be used to estimate the lung capacity, in liters of a female find the lung capacity of a 40-year old woman who is 165 cm tall.
*July 24, 2012*

**algebra***

Multiply (x^10+3)(x^10-3)
*July 24, 2012*

**algebra**

Short Answer. Add the following polynomials. (4x^2-3x+2)+(5x^3-7x^2-9)
*July 21, 2012*

**algebra**

Solve. Leave the answers in terms of pi ?. a)Find a polynomial for the sum of the areas of the circles shown in the figure. b)Find the sum of the areas when r = 5 and r = 11.3. this is what I got but I did not do it right. I needed to To write an expression for the sum, i need...
*July 21, 2012*

**algebra**

find a polynomial for the shaded area of each figure. (21t+8)(4t)-(3t-4)(2t) I did this problem incorrectly!
*July 21, 2012*

**algebra**

Solve. Leave the answers in terms of pi ?. a)Find a polynomial for the sum of the areas of the circles shown in the figure. b)Find the sum of the areas when r = 5 and r = 11.3. this is what I got but I did not do it right. I needed to To write an expression for the sum, i need...
*July 20, 2012*

**Statistics**

Find the probability of at least one match. n = 62 How do I figure out r?
*July 6, 2012*

**Physics**

I'm having trouble following this. How do you go from: GM/4R - GM/R = -GM/(R + h) to 3/4R = 1/(R+h) to h=R/3?
*June 28, 2012*

**Physics**

Eris, the largest dwarf planet known in the Solar System, has a radius R = 1200 km and an acceleration due to gravity on its surface of magnitude g = 0.77 m/s2. (a) Use these numbers to calculate the escape speed from the surface of Eris. (b) If an object is fired directly ...
*June 28, 2012*

**calculus**

(SIN^8X-5 SIN^5X+SINX)COSX DX I need the answer to this, because I have tried so many times and cannot figure it out.
*June 28, 2012*

**Physics**

The Moon causes tides because the gravitational force it exerts differs between the side of the Earth nearest the Moon and that farthest from the Moon. Find the difference in the accelerations toward the Moon of objects on the nearest and farthest sides of the Earth. (The mass...
*June 26, 2012*

**College Essay**

Thanks! I will try to elaborate more why this experience is special to me in my conclusion...
*June 18, 2012*

**College Essay**

Well one of the options for the Common App is to: Evaluate a significant experience, achievement, risk you have taken, or ethical dilemma you have faced and its impact on you. So do you think this would be acceptable as my "significant experience", or is it too strange?
*June 18, 2012*

**College Essay**

One seemingly normal day in junior year, my friend and I were taking a train together home from school. We were on an extremely crowded F train headed for Queens. Packed against the door that separated one train car from another, overly warm and squished with no pole nearby to...
*June 18, 2012*

**physics**

I would tell you the steps I've taken so far but I have no idea where to even start. Any help is appreciated! Thanks! A uniform 33.5-kg beam of length = 4.15 m is supported by a vertical rope located d = 1.20 m from its left end as in the figure below. The right end of the...
*June 16, 2012*

**Neoclassicism I english 11**

yeah i need the answers too.
*June 16, 2012*

**Accounting**

I need help in working this problem...please help... Gaines Company recently initiated a post audit program. To motivate employees to take the program seriously, Gaines established a bonus program.Managers receive a bonus equal to 10 percent of the amount by which actual net ...
*June 14, 2012*

**Accounting**

I am trying to figure out how to do this problem: scenarios (projected $90,000 annual cash inflow vs. projected $70,000 annual cash inflow). Note, 5 years of $90,000 per year equals $450,000 of total cash received over the duration of the project ($350,000 for 2nd project). ...
*June 14, 2012*

**math**

The answer is 16 because when you use FIOL for (5x-4)(5x-4) you get 25x^2 -20x-20x+16.Then you simplify to 25x^2-40x+16 to your original problem with the answer of 16 in the problem. FIOL is multiplying... the FIRST term then INNER terms then OUTER terms finally your LAST terms.
*June 6, 2012*

**physics**

If a concave mirror with a radius of curvature of 0.93 m has an object placed at 0.37 m in front of it, what is the mirror's focal length? Round your answer to 3 decimal places.
*June 4, 2012*

**physics**

If a concave mirror with a radius of curvature of 0.93 m has an object placed at 0.37 m in front of it, what is the mirror's focal length? Round your answer to 3 decimal places.
*June 4, 2012*

**Calc**

Oh, I forgot all about L'Hospital's Rule. Thanks!
*May 25, 2012*

**Calc**

Find the limit as x approaches zero from the right of ((sqrt((1+x)/(x^2))-(1/x)) I don't even know where to start with this. Help? P.S. If you go to the wolfphram alpha website and put copy and paste ((sqrt((1+x)/(x^2))-(1/x)) into the search bar you can see what it looks ...
*May 25, 2012*

**Maths B**

Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.
*May 24, 2012*

**Year 11 English**

thanks alot!!!
*May 24, 2012*

**Year 11 English**

Imagine you are the director of Rabbit-Proof Fence. Using what you have learned so far, how would you instruct the camera operator to help you communicate: a) how the girls are feeling during their walk home? b) how vast and empty the landscape is within the same scene? (1 ...
*May 24, 2012*

**chemistry HELP plz!**

The answer is b. 31P
*May 24, 2012*

**Maths B**

i don't get what you mean. Can you please explain it to me again.
*May 24, 2012*

**Maths B**

Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.
*May 24, 2012*

**Maths B**

Work out the 5 number summary Min=3 Q1=6 Median=8 Q3=14.5 Max= 24 IQR=Q3-Q1 =14.5 - 6 =8.5 Work out if 24 is an outlier or not. x-Q3>1.5*IQR 24-14.5>1.5*8.5 9.5>12.75 24 is an outlier
*May 24, 2012*

**Year 11 Maths B**

So does that mean n1=35 n2=8 m1=1715 m2=424 Total bag count: 43 Total Mass: 2139 New mean mass: 49.74418605 Round it to the nearest kilo 50kg. Is that correct???
*May 24, 2012*

**Geometry**

The volume of an oblique cone with equal diameter and height is 18pi cm^3. Find the height and radius(to the nearest cm).
*May 21, 2012*

**Physics**

A wave on a string is described by the following equation (assume the +x direction is to the right). y = (18 cm) cos[ðx/(5.3 cm) - ð t/(14 s)] What is its period? What is its speed? In which direction does the wave travel? To the left or to the right?
*May 20, 2012*

**dosing**

thank u
*May 17, 2012*

**dosing**

1 tbsp= 15 ml 1 fl.oz = 30 ml And then how many dose will be obtained in 12 fl.oz?
*May 17, 2012*

**dosing**

if 1 tablespoon is prescribed as a dose of medicine,approximately how many doses will be obtained in 12 fl.oz?
*May 17, 2012*

**Math Problem ( 6th grade math)**

Brandon tosses a coin 500 times. The coin lands on tails 320 times. A: What is the experamental probability of getting heads? B: Is the coin fair or unfair? Explain you answer.
*May 16, 2012*

**Math!!**

Eric bowls 35 times and gets 15 strikes. Fine the experimental probability that eric will bowl a strike. The answer first. Then explain what you did to get the answer
*May 16, 2012*

**math**

If d is the distance, and r is the radius of the earth (in feet), r^2 + d^2 = (r+32000)^2
*May 16, 2012*

**Geometry**

Given circle E with diameter AC and m<DAC=62 degrees, find mAD(arc).
*May 16, 2012*

**Math**

Anybody there???
*May 15, 2012*

**Math**

Also, Explain in words how you determined the probability of the player making the free throw.
*May 15, 2012*

**Math**

Thank You So Much Ms. Sue! Are you a teacher?
*May 15, 2012*

**Math**

So 1/3 would be the probability that the player makes the free throw?
*May 15, 2012*

**Math**

Well A player makes 4 of 12 free throws. Question: What is the Probability that the player makes the free throw?
*May 15, 2012*

**reading**

Did you read the story?
*May 15, 2012*

**6 grade math**

Yes. Im in 6th grade also and i did intergers last month and yes you are correct! Good Job
*May 15, 2012*

**science**

When a Gila monster uses a rock for shade from the noonday sun, it is interacting with _____. (1 point) an abiotic factor another organism an ecosystem its community
*May 15, 2012*

**Pre-Calc**

How would you prove this identity? (sin^3(x)+cos^3(x))÷(1-2cos^2(x)) = (sec(x)-sin(x))÷(tan(x)-1)
*May 10, 2012*

**Medical Terminology**

I have to write a fictitious medical report containing this weeks vocab. It has to be at least 2 paragraphs describing a dermatologic condition or disease and contain all of the vocabulary and their definitions. My question is...how do I format this? If someone could give me ...
*May 7, 2012*

**Biology**

Another brain teaser I can't get: What are Mr. Rahn's favorite states" Hint: "it matters"
*May 1, 2012*

**Biology**

I can't figure out these brain teasers: i.e.point act char er ILL GET IT
*May 1, 2012*

**Calculus**

I'm supposed to find the average value of the function over the given interval. f(x) = sin(nx), interval from 0 to pi/n, where n is a positive integer. I know the average value formula, and I know that the integral of that function would be (-1/n)cos(nx), but I keep ...
*April 27, 2012*

**Geography**

What is the easternmost nation of southern Europe?
*April 27, 2012*

**math**

what is the unit rates for a store that had 30 customers in 12 min.
*April 25, 2012*

**Chemistry**

A solution contains 0.55 g of dissolved Sn 4+ ions. How many grams of Na2CO3 must be added to the solution to completely precipitate all of the dissolved Sn4+?
*April 23, 2012*

**AP Chem**

okay so i think i did this question correct but i get a little confused with equivalence point. If there is 25 ml of a .300M solution of HNO2...when i set up my ICF table, does that mean there is 7.5 mmol of HNO2 and OH- in the equation HN02 + 0H --> NO2 + H20 since it is ...
*April 23, 2012*

**AP Chem**

Consider 25.0 ml of .300 MHNO2 that is titrated with .500 M Find ph at eq pt
*April 23, 2012*

**AP Chem**

1.513g of monoprotic acid (HX) is dissolved in water, and the volume is 250.0 ml after the dissolving. The solution was then titrated 38.12g of .100 M NaOH to reach the end point of the titration. What is the molecular weight of HX?
*April 23, 2012*

**chemistry**

what are metals and non metals that are found in the human body and their function?
*April 21, 2012*

**chemistry**

what are the applications of the silicon atom with its isotopes of 28,29,and 30?
*April 19, 2012*

**chemistry**

give at least 3 atoms with its isotopes and its application?
*April 19, 2012*

**Chemistry**

What mass of Helium will occupy 2 times the volume of 10.0 grams of Neon if both gases are measured at STP?
*April 18, 2012*

**Chemistry**

A gas mixture contains 4.00 grams of O2 and 4.00 grams of He. If the total pressure of the gas sample is 4.67 atm, what is the partial pressure of each component?
*April 18, 2012*

**Algebra 2**

You would divide everything by 3 leaving you with f-1(x)= x/3 - 4
*April 18, 2012*

**Analytical Chemistry **

How many millimoles and molecules of solute are in 500 ml of a solution that is 5.41 ppm KMnO4?
*April 18, 2012*

**math**

A hypothesis test is conducted with respect to the mean weight (in ounces) of potato chip bags form a certain manufacturer. The hypotheses are: H0: = 0.8 and Ha: ≠ 0.8. Which confidence level would support the conclusion that there is insufficient ...
*April 17, 2012*

**math**

two negatives make a positive
*April 17, 2012*

**chemistry**

55.85 g/mol
*April 17, 2012*

**statistics**

The power of a significance test for a particular value of the parameter is computed to be 0.93. Which statement below is true? a) The probability of committing a Type I error is 0.07. b) The probability of committing a Type I error is 0.93. c) The probability of committing a ...
*April 17, 2012*

**statistics**

An SRS of size n is taken from a large population whose distribution of income is extremely right-skewed and the mean income is calculated. Which of the following statements is false? a) When n > 30, the sampling distribution of is approximately normal. b) When n increases...
*April 17, 2012*

**Physics**

A metal plate has a charge density of 85uc/cm^2 : Calculate the electric field strength at 14 cm above the plate
*April 17, 2012*

**chemistry**

Is it okay taking caffeine then ascorbic acid?
*April 17, 2012*

**physics**

I'm guessing skater 3, since they have the most mass and speed. Try plugging them into its formula
*April 16, 2012*

**child day care**

You’ve decided to operate a day care home. Which one of the following factors is the most important in helping you make your decision? A. Your family is willing to share their living space with the children in the program. B. Your home seems to be large enough. C. You ...
*April 13, 2012*

**Physics**

Find the speed of sound (in m/s) at -35°C at 1 atm pressure in dry air.
*April 13, 2012*

**Chemistry- intermolecular forces**

When a benzoate ion goes through solvation, what is the intermolecular force involved? Is is hydrogen bonding?
*April 12, 2012*

**math**

the cost of travelling by bus is Rs10 for the first km and RS 3 for every additional km. how much must be paid for a journey of 20 km?
*April 10, 2012*

**art history**

what was the most important contributing factor to the rise of cities?
*April 9, 2012*

**art history**

how did monasticism and feudalism differ? give two examples
*April 9, 2012*

**algebra**

1/z+8/1/z-2
*April 3, 2012*

**algebra**

Simplify, using only positive exponents in your answer. x^-4+y^-4/x^-3+y^-3
*April 1, 2012*

**algebra**

An investor invested a total of of $2500 in two mutual funds. One fund earned a 7% profit while the other earned a 4% profit. If the investor's total profit was $14, how much was invested in each mutual fund?
*March 30, 2012*

**algebra**

r^3+216/r+6=
*March 30, 2012*

**algebra**

f(x)=v^2+13/v^2-4v-32 Find all numbers that are not in the domain of the function. Then give the domain in set notation.
*March 29, 2012*

**Physics**

If you look at yourself in a shiny Christmas tree ball with a diameter of 9.0 cm when your face is 38.0 cm away from it, where is your image? (Your answer should be positive if the image is in front of the ball's surface, and negative if the image is behind it.)
*March 28, 2012*

**algebra**

A person needs to prepare 130 pounds of blended coffee beans for $5.27 per pound. He plans to do this by blending together a high-quality bean costing $6.50 per pound and a cheaper bean at $2.50 per pound. To the nearest pound, find how much high-quality coffee bean and how ...
*March 28, 2012*

**Civics**

Forget about the treaties part.
*March 27, 2012*

**Civics**

Is a trial of impeachment held with or without a jury? How about treaties? And murder?
*March 27, 2012*

**math**

what might you have if you don't feel well?
*March 27, 2012*

**Algebra**

A boat's crew rowed 7.5 downstream,with the current, in 1.5 hours. The return trip upstream against the current,covered the same distance,but took 2.5 hours. Find the crew's rate in still water and the rate of the current.
*March 27, 2012*

**Science (PLEASE HELP)**

The oceans are so large that many people believe the oceans can absorb vast amounts of pollution without harm. Analyze the error in this concept, and explain how ocean pollution can affect human food supplies?
*March 26, 2012*

**Physics**

(a) A 2.20 cm high insect is 1.24 m from a 135 mm focal-length lens. What is the image distance? mm How high is the image? cm What type is it? (Select all that apply.) The image is upright. The image is inverted. The image is behind the lens. The image is in front of the lens...
*March 25, 2012*

**counseling**

Each student will write a paper on a specific DSM disorder (e.g., not anxiety disorders, but a specific aspect of a specific anxiety disorder. I am not sure what the instructor is wanting I want to do a paper on Attention Deficit Hyperactive Disorder (ADHD) but not sure what ...
*March 20, 2012*

**Physics**

Figure a is a partial graph of the position function x(t) for a simple harmonic oscillator with an angular frequency of 1.75 rad/s; figure b is a partial graph of the corresponding velocity function v(t). The vertical axis scales are set by xs = 2.50 cm and vs = 2.50 cm/s. ...
*March 16, 2012*

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