Sunday

October 4, 2015
Total # Posts: 1,034

**Math**

A country's Consumer Price Index (CPI) is a measure of the cost of living. The inflation rate is the annual relative rate of change of the CPI. Use the data in the following table to estimate the inflation rate for each of years 2007–2012. Year 2007 CPI 202.077 Year ...
*September 30, 2015*

**Math**

Distribution of exam 2 scores is unimodal and symmetric with a mean of 78 and a standard deviation of 4.6 points. What exam score corresponds to z- score of -2.46
*September 27, 2015*

**Algebra**

Using two lawnmowers and working together Tom and Anne can mow the lawn in 36 minutes. It takes Anne 90 minutes if she mows the lawn herself. How long would it take Tom to do the job working alone?
*September 24, 2015*

**Math**

If you deposit 10,000 every year into an account paying 5% interest compounded annually, how long will it take to accumulate 1,000,000?
*September 20, 2015*

**Math**

Find the effective rate of interest for 5% compounded monthly.
*September 18, 2015*

**Math**

Carletta has 23000 dollars to invest. As her financial consultant, you recommend that she invest in Treasury Bills that yield 7%, Treasury Bonds that yield 8%, and corporate bonds that yield 9%. Carletta wants to have an annual income of 1800 dollars, and the amount invested ...
*September 14, 2015*

**math**

that is what I thought thank you!
*September 2, 2015*

**math**

How do I work 2s^3-4r^2 if s=5 and r=1?
*September 2, 2015*

**Physics **

A 60-kg soccer player kicks a stationary 0.4 kg ball giving it a speed of 14 m/s. The player's foot is in contact with the ball for 0.08 second. What is the average force on the ball?
*August 31, 2015*

**Physics **

A 60 kg soccer player kicks a stationary 0.4 kg ball giving it a speed of 14 m/s. The player's foot is in contact with the ball for 0.08 second. What is the average force on the ball? P.S What formula/s should I use?
*August 29, 2015*

**math**

if about 32,680 kilobytes of memory is still available how many more pictures can they take
*August 27, 2015*

**Math 10**

Thank you so much. It really helps me 😂
*August 27, 2015*

**Math 10**

EXPONENTIAL EQUATION Find the X 3^x - 82/9 = -3^-x
*August 27, 2015*

**math**

15, 30,45,60 20,40,60,80 LCM= 60 60 divided by 15= 4
*August 26, 2015*

**Physics**

A newly discovered particle, the SPARTYON, has a mass 895 times that of an electron. If a SPARTYON at rest absorbs an anti-SPARTYON, what is the frequency of each of the emitted photons (in 1020 Hz)? The mass of an electron is 9.11×10-31 kg.
*August 16, 2015*

**Physics**

Take element Z = 24 from the periodic table. Ionize it 23 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron?
*August 15, 2015*

**Physics**

An atom is ionized so that it has only one electron. When the electron drops from the n = 6 shell to the n = 1 shell, an X-ray of wavelength 193.76 pm is emitted. What is the atomic number?
*August 12, 2015*

**PHYSICS**

The temperature of the cosmic background radiation is measured to be 2.7 K. What is the wavelength of the peak in the spectral distribution at this temperature? What frequency corresponds to this wavelength?
*August 10, 2015*

**PHYSICS**

Suppose that at least 13.0 eV is needed to free an electron from a particular element, i.e., to ionize the atom. What is the lowest frequency photon which can accomplish this? And, what is the corresponding wavelength for that photon? Give frequency for answer 1 and wavelength...
*August 10, 2015*

**Physics**

Monochromatic light of wavelength, λ is traveling in air. The light then strikes a thin film having an index of refraction n1 that is coating a material having an index of refraction n2. If n2 is larger than n1, what minimum film thickness will result in maximum ...
*August 6, 2015*

**Physic**

A positive charge of 4.90 μC is fixed in place. From a distance of 3.20 cm a from the fixed positive charge, a particle of mass 5.00 g and charge +3.20 μC is released from rest. What is the speed of the +3.20 μC when it is 7.50 cm away from the fixed positive ...
*July 28, 2015*

**science: chemistry**

How many moles of NaOH must be added to 1.0 L of 2.6 M HC3H5O3 to produce a solution buffered at each pH? 1)pH= 4.28 2)pH=pKa
*July 23, 2015*

**science: chemistry**

A buffered solution is made by adding 47.4 g C2H5NH3Cl to 1.00 L of a 0.68 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)
*July 23, 2015*

**Physics **

A bridge is 200 m long. A car weighing 2.5 metric tons is 50 m from one end of the bridge and a trucj weighing 6 metric tons is 80 m from the other end. The bridge is uniformly paved and weighs 20 metric tons. How much force does the vertical support at each end exert?
*July 19, 2015*

**Physics **

A 30-N non-uniform pole, 5m long, was used to carry a load of 400 N by two men. The load was hung at the middle of the pole. Find the center of gravity of the pole if the force exerted by each man on each end were 220 N and 210 N respectively.
*July 19, 2015*

**Physics **

The ends of a rope are tied to two hooks on a ceiling. A set of books weighing 36.0 N is tied and hung on the rope so that the segments of the rope make angles of 35 degrees and 50 degrees respectively with the horizontal. Compute for the tension on each segment of the rope.
*July 19, 2015*

**Physics **

A borad, 3m long, is hinged at point a and is supported by a vertical rope at point b, 2m from a. A boy weighing 200 N stands at the end of the board at point c. Neglecting the weight of the board, calculate the force on the rope.
*July 19, 2015*

**Physics **

A uniform rod 1.2 m long has weight of 1000 dynes and 2000 dynes at its ends. At what point on the rod can it be balanced horizontally if the rod weighs 2500 dynes?
*July 19, 2015*

**Physics **

A weight of 340 N is suspended from a pole by means of a rod 4m long and a rope tied to one end 3m above. Find the tension on the rope the force of the rod.
*July 19, 2015*

**Physics **

A girl weighing 310 N sits on a hammock supprted by two ropes. Each tied 60 degree from vertical posts. What is the tension on each rope?
*July 18, 2015*

**Math**

How much does it cost in dollars to watch the 5.00 hour-long coverage of the Super Bowl on a 115 Watt television set? Assume that one kWh electricity costs 9.41 cents.
*July 14, 2015*

**Physics**

The electric potential at a position located a distance of 20.1 mm from a positive point charge of 6.50×10-9C and 12.1 mm from a second point charge is 1.26 kV. Calculate the value of the second charge.
*July 13, 2015*

**Physics**

Four identical point charges of q = 4.64 nC are at the four corners of a square with a side length of 13.5 cm as shown in the figure. What charge Q should be placed at the center of the square to keep the other four charges in equilibrum?
*July 9, 2015*

**Physics**

Answer True or False to each case. Coulomb's law states that the force between static charges Q1 and Q2 is proportional to Q1 Q2. is proportional to the total charge Q1+Q2. is K Q1Q2/r where K is a universal constant. is proportional to 1/r2. is a force of attraction.
*July 9, 2015*

**geometry**

In triangle ABC, X and Y are the midpoints of BC and AC, respectively. The perpendicular bisectors of BC and AC intersect at a point O inside the triangle. If angle C = 47 degrees, then find the measure of angle XOY?
*June 5, 2015*

**French**

HELP!!
*June 2, 2015*

**French**

4rth (PAST tense) (different story) summary... 1.) There was a rat whose name is Remy. 2.)He was a resident in Paris. 3.)He enjoyed cooking 4.) He created complex dishes. 5.) He was satisfied with his work. ___________________________________ 1. ) Il y avait un rat dont le nom...
*June 2, 2015*

**French**

3rd (present tense) summary: 1.) There is a man whose name is Jacky. 2.)He likes to cook. 3.)It is his passion. 4.)Jacky cooks with Mr. Lagarde. 5.) Jacky is happy. 1.) Il y a un homme qui s'appelle Jacky. 2.) Il aime culsiner. 3.) C'est sa passion. 4.) Jacky (cooks) ...
*June 2, 2015*

**French**

Thankyou... I have 3 more summaries that I'd like you to check! English: 1.) There is a boy whose name is Ben. 2.) He is 17 years old. 3.) He wants a car. 4.) He goes to Haiti, a poor country, with his family. 5.) He is content with his life. French: 1.) Il y a un homme ...
*June 2, 2015*

**French**

Are my French sentences right? Can someone check? Merci. 1.) Il y a une fille qui s'appelle Fama . 2.) Elle est quinze ans . 3.) Elle est (from) Mauritanie . 4.) Elle (goes to) Californie. 5.) Elle vit avec une famille américaine. _________________________________ ...
*June 2, 2015*

**chemistry**

2.852 x 1/16 =00.17825g
*March 17, 2015*

**chemistry**

2.241 g sample of nickel combines with oxygen to produce 2.852 g of metal oxide. Calculate the number of grams of xygen in the metal oxide.
*March 17, 2015*

**Chemistry**

Enthalpy*
*March 9, 2015*

**Chemistry**

Neutralization reaction HCL(aq) + NaOH(aq) -> NaCl(s) + H2O(l) Use your results to determine the netball change of the neutralization reaction, in kJ/mol of NaOH, Write the thermochemical equation for the neutralization reaction. I'm not sure how to even go about doing ...
*March 9, 2015*

**math**

Six unit circles are arranged inside a rectangle. the circles are tangent to each other and tangent to the rectangle as they appear in the diagram. What is the area of the rectangle?
*March 8, 2015*

**marketing principles and information technology**

the 4ps of marketing are?
*March 4, 2015*

**Management**

within an organization the first step in human resources planning is
*February 22, 2015*

**Chemistry**

Calculate the rms speed of Br2 molecules at 23 °C and 1.00 atm. What is the rms speed of Br2 at 23 °C and 1.50 atm?
*February 19, 2015*

**Chemistry**

At standard temperature and pressure, a 1.00-mol sample of argon gas is vented into a 22.4-L rigid box that already contains 1.00 mol of nitrogen gas. We would expect the argon gas to:
*February 19, 2015*

**math**

Thank you so much for the help, this explains so much!!
*February 16, 2015*

**math**

I'm just having trouble trying to see the independent and dependant variables. I have to determine whether the following are functions: The relation between distance and time if someone walks 5km/h. I think distance would be the independent variable because you can go ...
*February 16, 2015*

**physics **

Does the sun move to the west and accelerate east?
*February 11, 2015*

**chem**

When solid calcium is placed in water, it undergoes a vigorous reaction that produces solid calcium oxide, CaO(s) and hydrogen gas. determine the volume of dry hydrogen gas that is produced when 5.00 g of calcium reacts and the gas is collected at 42 degrees celsius and 770 ...
*January 12, 2015*

**chemistry**

I juiced the lemons again and got 50 ml and 140g. 8% of citric acid mol C6H8O7 = 140g x (1 mol/192.14g) 192.14 is the molar mass of C6H8O7 = .7286 mol c= n/v .7286 mol/.050 L =14.57 M %8 C6H8O7 = 14.57 M x .08 = 1.166 M I needed to find 8% of citric acid so I just pretended ...
*January 8, 2015*

**chemistry**

I'm trying to find the weight of a lemon. Weight of container= 48 g Container + pure lemon juice = 184 g (100 ml) Pure lemon juice= 184g-48= 136g Does this make sense? Because I thought lemon had around the same density to water... wouldn't that mean my answer should ...
*January 8, 2015*

**chemistry**

But that link is for water. Lemon juice has a different density than water.
*January 8, 2015*

**chemistry**

how could I figure out how many grams of pure lemon juice (squeezed from lemons) are in 100 ml?
*January 8, 2015*

**chemistry**

So I've made my cleaner, and I only had 300 ml of vinegar at home. The mass is 283g. So I found out the moles by doing 283g x (1 mol / 60.06g) = 4.71 mol The 60.06 was the molar mass of vinegar I found the concentration by doing c=n/v c= 4.71 mol / 300 ml Do I do c=n/v by ...
*January 6, 2015*

**chemistry**

When you say M, you're talking about the molar mass, not mol/L, right (my chef teacher uses M for both). And 1 mole of any element is an amount equal to its atomic mass in grams so that makes way more sense. Well thank you very much and have a good night :)
*January 6, 2015*

**chemistry**

Thank you so incredibly much of helping me, it all makes so much more sense than it did before. I get what you're saying with the vinegar and percentage but now I'm just wondering how you got 60 g as 1M if the total volume is 1L for acetic acetic acid?? How could I ...
*January 6, 2015*

**chemistry**

OH I see what you mean. So I don't really need a set chemical equation. The question on my page says that I must have "the concentrations of the active ingredients. List the concentrations of all active cleaning ingredients, and all calculations involved in ...
*January 6, 2015*

**chemistry**

Basically, I need to write an equation so I can find the moles and then find the concentrations. I need to create a cleaner for class and I need to do calculations. So like if i did: CH3COOH + C6H8O7 +H2O acetic acid in vinegar + citric acid in lemon juice + water... what ...
*January 6, 2015*

**chemistry **

So I have to make a green cleaner for a project in chemistry. I think my ingredients should be: vinegar, salt, water, and lemon juice. But I don't know how I would write that exactly as a chemical formula. How could I write a chemical equation if I have 4 reactants? I can ...
*January 6, 2015*

**chemistry**

So I did a titration lab at school with NaOH and HCl. i have to find: - volume used, NaOH - Moles of NaOH - Moles of HCl -Volume used unknown HCl - Molarity of HCl solution My concentration of NaOH stock solution was 0.100 mol/lL Final buret reading, NaOH: 14.20 ml Initial ...
*January 4, 2015*

**chemistry 11**

Food manufacturers sometimes add calcium acetate to puddings and sweet sauces as a thickening agent. What volume of 0.500 mol/L calcium acetate, Ca(CH3COO)2 (aq), contains 0.300 mol of acetate ions? So I've been over this a hundred times and I still can't get past the ...
*December 17, 2014*

**chemistry**

Ohhh I see now. Thank you so much!
*December 15, 2014*

**chemistry**

What mass of sodium hydroxide pellets must be poured into a waste drum containing 20.0 L o 3.0 mol/L sulphuric acid to completely neutralize the waste acid solution? Write a balanced chemical equation for this reaction. okay, so here is the work I already did my balanced ...
*December 15, 2014*

**Math**

No problem
*December 5, 2014*

**Math**

Correct!
*December 5, 2014*

**Math**

I mean multiply! Sorry!
*December 5, 2014*

**Math**

Yah! Now divide 2
*December 5, 2014*

**Math**

You did the division wrong
*December 5, 2014*

**Math**

First divide 2187 and 3 then multiply 2 by your answer
*December 5, 2014*

**chemistry**

Ohhh I get it, so I was supposed to change the formula to n= C x V? That makes a lot more sense, thank you so much!
*December 1, 2014*

**chemistry**

What mass of solute is present in each aqueous solution? 40 mL of 6.0 mol/L, H2SO4, solution Soo I did: C=n/V 40 mL= 0.04 L C= 6.0 mol/L/0.04 L = 150 mol/L MH2SO4= 2.02 g/mol + 32.07 g/mol + 64 g/mol= 98.09 g/mol mass H2SO4= 150 mol x (98.09g/1 mol) = 14713.5g =1.47 x 10^4 Is ...
*December 1, 2014*

**Chemistry**

What are the steps to solve this problem? "The enthalpies of combustion of glucose and ethanol are -2813kj/mol and -1369kj/mol, use Hess's law to calculate the enthalpy change when 0.500 kg of glucose is allowed to ferment." Please help.
*November 28, 2014*

**chemistry**

Wow, thank you so much that was very descriptive, I really appreciate it!
*November 27, 2014*

**chemistry**

3CuCl2 *2H2O + 2Al = 3Cu + 2AlCl3 + 6H2O Determine the number of grams that should have been produced when 1.25g of copper (2) chloride dehydrate reacts with excess aluminum so i'm not really sure how you're supposed to calculate the number of grams with hydrates?? ...
*November 27, 2014*

**math**

The volume of a pyramid varies jointly with the base area of the pyramid and its height. The volume of one pyramid is 24 cubic inches when its base area is 24 square inches and its height is 3 inches. What is the volume of a pyramid with a base area of 10 square inches and a ...
*November 15, 2014*

**US History **

In regards to decisions affecting foreign policy, how did Jefferson’s actions as President validate or contradict his philosophical views as a Democratic-Republican?
*November 14, 2014*

**Math**

5/6 x 360 = 300
*October 21, 2014*

**physics**

A dolphin leaps out of the water at an angle of 24.9 ° above the horizontal. The horizontal component of the dolphin's velocity is 5.05 m/s. Find the magnitude of the vertical component of the velocity.
*October 8, 2014*

**physics**

On a spacecraft, two engines are turned on for 525 s at a moment when the velocity of the craft has x and y components of v0x = 4780 m/s and v0y = 8850 m/s. While the engines are firing, the craft undergoes a displacement that has components of x = 3.54 x 106 m and y = 7.77 x ...
*October 2, 2014*

**Physics 1**

A block is given an initial velocity of 9.00 m/s up a frictionless incline of angle θ = 21.0°. How far up the incline does the block slide before coming to rest?
*September 25, 2014*

**Math Help!!**

Two phone companies offer discount rates to students. The first company wants $9.95 per month plus $.10 per minute for long distance calls. The second company wants $12.95 per month plus $.08 per minute for long distance calls. Write a linear equation describing the total cost...
*September 21, 2014*

**Math**

Two phone companies offer discount rates to students. The first company wants $9.95 per month plus $.10 per minute for long distance calls. The second company wants $12.95 per month plus $.08 per minute for long distance calls. Write a linear equation describing the total cost...
*September 20, 2014*

**Math**

what does that mean?? write the place and value of each number. 1)5,272,468,693 what is the selected digit in? ^ its eight
*September 18, 2014*

**math**

add all of the dvds up so 12+15+9=36 the ratio is action : total action is 12 total is 36 12:36 is your answer
*September 15, 2014*

**Chemistry**

Complete each calculation. Express your answer to the correct number of significant digits. a)4.02mL + 3.76mL +0.95mL b)(2.7 x 10^2m) x (4.23 x 10^2m) c)5092kg divided by 23L d) 2-6.3 + 6-7 e)(6.853 x 10^3L) + (5.40 x 10^3mL) f)(572.3g + 794.1g) divided (24mL + 52mL) My ...
*September 11, 2014*

**Algebra**

Is 32 =8x - 8 an example of an open equation? My answer is yes
*August 27, 2014*

**Algebra**

You are right the first position in the ordered pair is always the value. Thank you
*August 27, 2014*

**Algebra**

Is (1, -4) a solution for the equation y = -2x? My answer is 1 = 2 (-4) 1 = -8 No it isn't
*August 27, 2014*

**Algebra**

How can you use an equation to make a prediction from a pattern. I think that you can do based on the pattern giving you a base of probability to forecast with a reasonable degree of confidence something in the future.I would think that your degree of confidence might depend ...
*August 27, 2014*

**chemistry**

If 3.65 g of a compound having a molecular weight of 481.93 g mol-1 is dissolved in water to make a final volume of 142 mL, what is the concentration of the solution in mM? Answer to three significant figures.
*August 1, 2014*

**physics**

At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 1.00 kJ·s–1·m–2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 2.60 ...
*June 17, 2014*

**Math**

Traveling in France, Miguel exchanged 12 U.S. dollars for 82.8 francs. A few days later, he exchanged 25 U.S. dollars for francs and got the same exchange rate. How many francs did Miguel receive? Round to the nearest tenth.
*June 12, 2014*

**chemistry**

a scuba driver is using eanx32, an enhanced nitrox gas mixture. this mixture contains 32% oxygen with 68% nitrogen. if the cylinder is at a pressure of 250 kpa, what is the partial pressure of oxygen?
*June 5, 2014*

**biology**

if a population comprised 52 AA, 114 Aa and 34 aa individuals and the 'A' allele was dominant, what would be the genotype, allele, and phenotype frequencies be
*June 3, 2014*

**chemistry**

What is the pH of a 0.001 M solution of acetylsalicylic acid (aspirin) (Ka 3.0 x 10-4)?
*May 19, 2014*

**statistics**

A survey of 100 commuters finds the average commuting to work is 25.5 minutes with the standard deviation of 11.5 minutes. construct a 98% confidence interval for the mean commuting time of commuters answer: 100%-98%=2%=0.02=0.01=1.28 E=1.28.11.5 divide by 10= 1.47 (25.5-1.47...
*May 18, 2014*