Sunday

August 28, 2016
Total # Posts: 442

**PreCalculus**

A variable star is one whose brightness alternately increases and decreases. For the variable star Delta Cephei, the time between periods of maximum brightness varies by +/- 3.5 magnitude. (a)Find a function that models the brightness of Delta Cephei as a function of time. How...
*December 13, 2009*

**PreCalc**

sorry
*December 8, 2009*

**Jo**

That makes sense but were did you get of 7.9 from. Once I know that I under stand subtracting the period... just don't know were that value came from h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 2 4 6 6 3 4
*December 8, 2009*

**PreCalc**

Naturalists find that the populations of some kinds of predatory animals vary periodically. Assume that the population of foxes in a certain forest varies sinusoidally with time. Records started being kept when t = 0 years. A minimum number, 200 foxes, occured when t = 2.9 ...
*December 7, 2009*

**PreCalc**

h t t p : / /w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 2 3 0 7 8 3 thats fair but can i ask why you do not perfer to use a formula?
*December 7, 2009*

**PreCalc**

C = 2.9 D = 200 forgot to mention that put I implied that
*December 7, 2009*

**PreCalc**

h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 2 2 5 7 6 7 ok this is what i mean. For exmaple take this problem that I asked for help with before Naturalists find that the populations of some kinds of predatory animals vary periodically. ...
*December 7, 2009*

**Pre Calc**

please h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 0 2 2 5 7 6 7
*December 7, 2009*

**PreCalc**

y =( (C-A)/2 ) sin( (X - (A - ( (C - A)/2 ) ) )( pi/(C-A) ) ) + (B - ( (B-D)/2 ) How do I rearange this for this equation for the all of the variables including A, B, C, D, X were pi is the greek leter pi if you didn't notice this is the general formula for when you are ...
*December 7, 2009*

**geography**

why would the countryside get smaller, services are declining and also why are the costs expanded.
*November 20, 2009*

**math**

How do I work out Logs on my calculator to do the sum Log6x=0 or Logx64=2. I have a sharp EL-EL531WH Advanced D.A.L. What is x? This is how I work this one out on it, Log2^16=4 I do Log big number 16 /Log small number 2 = 4.
*November 11, 2009*

**math**

significant numbers 2.8723 * 1.6 = 4.59568. Is it 4.6 because it is the smallest number you are multiplying it by in the sum? e.g. 2.8723 has 5 signifigant figures but 1.6 has 2 so the answer has no more than 2.Smallest number of significant figures. With addition is it the ...
*November 11, 2009*

**cjs220**

Identify the bail system beneficiaries
*October 31, 2009*

**math**

how many picometers are there in a kilometre? Is the answer a negative or positive? =10^15 or = 10^-15
*October 12, 2009*

**math**

does 10^3 * 10^2 * 10^4 * 10^3 = 10^12
*October 12, 2009*

**math**

complete the following conversions. 155u to m = *10^-3 1850n to mm = *10^-6 1.68G to M = *10^3 from G to M = *10^3
*October 12, 2009*

**math**

how many picometers are there in a kilometre? The answer is 10^-15 or 10^15? Thanks
*October 12, 2009*

**math**

Write an explanation of the steps you use to convert a measurement in one unit to a measurement in another. 1) How many picometers are there in a kilometre?
*October 12, 2009*

**math**

Dear Bob I don't understand what you mean.
*October 12, 2009*

**math**

I really do not know how to get the answers to these, can you show me on a table form? Thanks 155km to m 2.56Ml to l 155um to mm 1,850nm to mm 1.68Gm to Mm 165pm to nm 2,750u to M 1.5kg to mg I would like to know how to work these out. Thank you
*October 12, 2009*

**physics**

15.97
*October 10, 2009*

**math**

If a vehicle travles with a constant acceleration of 3km/hr for 5 hours, what was its initial velocity if the final velocity was 100km/hr? Can you please show me how to work this out in math terms.Can you explain it to me. thank you so much.
*October 10, 2009*

**math**

If a stone is dropped from rest and falls under gravity with an acceleration of 10m/s2, how long will it take before the stone is travelling at 25m/s? Can you show me how to work this out with math rules. I do not get it. Thanks
*October 10, 2009*

**math**

If a car has an initial velocity of 103m/s and accelerates at 1m/s for 3 seconds, what will its final velocity be? Can you please show me how to work this question out with math answers and explain it to me. Thank you.
*October 10, 2009*

**math**

2,750um to Mm CF=10^12 2,750um=2,750*10^-12 What does CF stand for. small to big you divide, so why don't I divide by 5 lots of 1000. Can you please give me some examples of conversions like this one. Thanks
*October 10, 2009*

**math**

Can you please give me a few different math examples of what you meant when you said - You do not add powers with different exponents, but not powers of different bases. Thank you so much.
*October 10, 2009*

**math**

What is the difference between the constant of proportionality and the mean? Constant and Mean? Thanks
*October 10, 2009*

**math**

would 64974000345 be written 6.4*10^10 or 6.4974*10^10 2) how would you write 7.991*10-10 in scientific notation? 3) does 9.0 have 2 (sf) and 100.0000 have (7sf)?I'm confused about the trailing zeros when it comes to decimal points.These are trailing zeros. 4) What do you ...
*October 9, 2009*

**math**

convert each of the following: . 155km to m . 2.56Ml to l .155uF to mF . 1,850nm to mm . 1.68Gb to Mb . 165pm to nm
*October 9, 2009*

**math**

how many significant figures do the following numbers have? 1)0.023 2) 1000 3) 8120 4) 7.991 * 10^10 5) 0.00390 6) 9.010 * 10-2 7) 9.0 * 10^-3 8) 3.4 *10*4 9) 1090.00010. How is 1090.00010 written in scientific notation?
*October 9, 2009*

**math**

how would I write this in scientific notation 04980000007507 I am getting confused with it all can you help me fine examples with this. thanks also how would I add this up 10^4+10^4+10^3= is it 21000 or 10^11
*October 9, 2009*

**Statistics**

Safety researchers, interested in determining whether the occupancy of a vehicle might be related to the speed at which the vehicle is driven, have observed the following speed (mph) measurements for two random samples of vehicles. Alone With Pass 64 44 50 52 71 54 55 48 67 69...
*October 3, 2009*

**statistics**

For the following data independent samples, could the null hypothesis that the population means are equal be rejected at the 0.05 level? Sample1 Sample2 Sample3 Sample4 15.2 10.2 14.9 11.5 12.2 12.1 13.0 13.1 15.0 8.5 10.8 11.5 14.6 8.1 10.7 6.3 9.7 10.9 13.3 12.0 13.6 10.6 8....
*October 3, 2009*

**chemistry**

Isotonic saline is a 0.9%(g/100ml) solution of salty water. You are asked to make up 2 Litres of isotonic saline. How much salt should you weigh out? Is this right? 0.9g/100ml * 2000ml = 18g of salt should be weighed out.
*September 29, 2009*

**chemistry**

how many holecules are in 1 L of water (assume that the density of water is 1g/ml. I think 1000g/2*1.01 + 16.00g/mol =55.5 mol =55.5moles * 6.02*10^23molecules/mole =3.34 * 10^25 molecules
*September 24, 2009*

**math**

Where is the best place to look up and learn about algebra expressions then turned into equations? thanks
*September 23, 2009*

**math**

what iste geatest common factor of 42 an 63
*September 23, 2009*

**math**

I am having trouble with algerbra. simplifying expressions. e.g. write an equation to represent the following situation. Where is the best place to look this up for a beginner? e.g. N+5=23 T=3H where T represents Tobys weight. The adult weighed three times as much as the child...
*September 23, 2009*

**chemistry**

hi, I have redone this question. Is this right. How many grams of NO2 will be produced when 5.00 moles of NO react? 5 moles of NO2 produces 5 moles of NO (1:1ratio) mass(g) = 5 moles * 46g/mol = 230g
*September 23, 2009*

**math**

write the following in scientific notation: This is what I wrote, am I right? 2.033Km= 2.033 * 10 3 Km 54890W= 5.4890 * 10 4 W 0.073461Kg= 7.3461 * 10 -2Kg 0.00000641172m= 6.41172 * 10-6m 0.3695245454= 3.695245454 * 10-1
*September 22, 2009*

**chemistry**

5 moles of NO2 produces 5 moles of NO (1:1ratio) mass(g) = 5 moles * 46.01g/mol = 230g
*September 22, 2009*

**chemistry**

How many grams of NO2 will be produced when 5.00 moles of NO react? I have 5 moles of NO2 produces 5 moles of NO (1:1ratio) mass (g)=5 moles times 16.02g/mol=80.1g
*September 22, 2009*

**chemistry**

you have a block of ice that weighs 500g. how many CO2 molecules do you have?
*September 22, 2009*

**chemistry**

Why is balanced chemical equation for H2O written 2H2+0>2H20 and not H20>H20?
*September 21, 2009*

**chemistry**

Isotonic saline is often given to patients intravenously to replenish lost fluids. Isotonic saline is a 0.9g/100ml solution of salty water. You are asked to make up 2:1 of isotonic saline. How much salt should you weigh out?
*September 21, 2009*

**chemistry**

Isotonic saline and is often given to patients intravenously to replenish lost fluids. Isotonic saline is a 0.9% 9G/100ml) solution of salty water. You are asked to make up 21 of isotonic saline. How much salt should you weigh out?
*September 21, 2009*

**chemistry**

I am not sure I need help. thanks.
*September 21, 2009*

**chemistry**

if 10 mol of hydrogen reacted with oxygen, what volume of liquid water could be produced?
*September 21, 2009*

**science**

if 10 mol of hydrogen reacted with oxygen what volume of liquid water could be produced
*September 21, 2009*

**Science**

Repeated trials?
*September 15, 2009*

**linking verbs**

David relaxed on the couch after school.
*September 1, 2009*

**macroeconomics**

Assume that the government purchases decrease by 10 billion, with other factors held constant including the price level. Calculate the change in the level of real GDP demanded for each of the following values of the MPC. Then calculate the change if the government, instead of ...
*July 15, 2009*

**accounting**

14. Lear, Inc. has $800,000 in current assets, $350,000 of which are considered permanent current assets. In addition, the firm has $600,000 invested in fixed assets.
*June 28, 2009*

**ACcounting Ethics**

Approaches to Stakeholder Impact Analysis
*June 26, 2009*

**ACcounting Ethics**

3. Did Enron’s directors understand how profits were being made in this segment? Why or why not?
*June 7, 2009*

**pre-calc**

I dont understand how to convert the partial fractions into a system
*May 29, 2009*

**math**

how do u get the volume of a cylinder
*May 26, 2009*

**CRT**

Thank you so much! I got a 100% because of your help. I appreciate it. All of the answers were correct.
*May 7, 2009*

**want to know-math**

Substitution can also involve more complicated problems, like 5x^2 + 2y -6 = y, where y = -1 and x = 4. Just substitute in the same way, placing the value of each variable in place of the letter and simplifying. what dose this ^ mean is it like this 5 * 42 + 2 * -1 - 6
*May 7, 2009*

**3rd grade grammar**

Can you help me write an essay about neighborhood using the preposition there.
*May 4, 2009*

**science**

what are the five properties of equilibrium
*April 21, 2009*

**Math**

yes
*March 21, 2009*

**English**

Can you give me examples of homonym words for first graders?
*March 21, 2009*

**math**

For sum you may see addition, all together, total (there are several ways) For subtraction you could say difference, minus, take away etc..
*March 21, 2009*

**Human Services**

The class will be divided into two clusters for a debate about regulatory issues in health care and human services. The Pro Lobbyists will argue that, through standards and accountability, a highly regulated environment benefits the delivery of health care and human service to...
*March 11, 2009*

**Microeconomics**

Could you find the answers?
*February 13, 2009*

**Finance**

As a lender, state which financial ratios you would use and how you would use them to evaluate a company. Identify the limitations that a banker would have to take into account when evaluating the financial performance of a company.
*February 5, 2009*

**astronomy**

The totally ecliped full moon is reddish in color due to the solar prominences. true or false
*January 27, 2009*

**space**

Keplers second law notes that a planet should move fastes at aphelion. true or false
*January 27, 2009*

**Astronomy**

Which statement aout declination is FALSE. a. Polaris is almost at +90 degrees b. Stars passing your zenith have a declination equal to your local latitude c. Its origin is the celestial equator d. It is measured eastward in units of time e. It is much like latitude on the ...
*January 27, 2009*

**drama**

do you know any good urban myth sites? please could you send me some links. thankyou.
*January 14, 2009*

**Physics**

How do you find the max height of a projectile given the angle and Vi? Angle = 57.0 degrees Initial V = 46 m/s
*January 4, 2009*

**Physics**

The coefficient of friction = 0.256 Mass of and object = 356 kg What is force of friction? Is this correct?... Ff = umg = 0.256*356kg*9.81 = 894 N
*January 4, 2009*

**social studies**

I am currently writing a report on the Gadsen Purchase, for school. Do you know of any sites that possibly could help?
*October 23, 2008*

**Chemistry**

unitary* thanks
*September 30, 2008*

**Chemistry**

what is the difference bewteen a quantity and a number? a bathroom scale is 20kg mass, and a 50 poud mass how could you find a unitart rate to convert from pounds to kilograms? thanks
*September 30, 2008*

**5th grade math**

L - S = 18 L + S = 34 L = 18 + S (18 + S) + S = 34 18 + 2S = 34 2S = 34 - 18 2S = 18 S = ? L = ?
*September 30, 2008*

**algebra**

Write an algebraic equation for the English statement "Add 5 to the sum of 2 times x and the result is 21."
*July 27, 2008*

**ALGEBRA**

Use the distributive property to remove the parentheses in the following expression. Then simplify your result if possible. 10(P+5)
*July 20, 2008*

**algebra**

Use the indicated property to write an expression that is equivalent to the following expression. (5 .12).17 ((associative property of multiplication)
*July 20, 2008*

**algebra**

WRITE THW FOLLOWING PRODUCT USING SYMBOLS. THE PRODUCT OF 3 AND N
*July 20, 2008*

**algebra**

Write the following phrase using symbols. The product of 3 and n
*July 20, 2008*

**algebra**

tHE EVALUATE IS 3X+Y / Z+2Y
*July 20, 2008*

**algebra**

Use your calculator to evaluate the following expression if x = –2.57, y = 1.55, and z = –1.98. Round your answer to the nearest tenth. 3X+Y/Z+2Y
*July 20, 2008*

**algebra**

Use your calculator to evaluate the following expression if x = –2.57, y = 1.55, and z = –1.98. Round your answer to the nearest tenth.
*July 20, 2008*

**algebra**

If p = –4 and q = 2, evaluate 3p2 + 5q.
*July 20, 2008*

**algebra**

Evaluate. 42 + 2•7 – (5 • 4 – 15)
*July 20, 2008*

**algebra**

Evaluate. | –48 |
*July 20, 2008*

**algebra**

Evaluate. | –48 |
*July 20, 2008*

**algebra**

Suppose the temperature outside is dropping at a constant rate. At noon , the temperature is 70 degrees f and it drops to 58 degrees f at 5:00 P.M. How much did the temperature change each hour?
*July 20, 2008*

**Chemistry**

I think you solve the first two given values and find delta H and then used the delta H to find solubility of water
*June 25, 2008*

**Global Business**

Choose one of the L'Oreal corporation products. 1. Answer- Mascara Describe the components of this product value. (Help) What strategic alternatives are open to the L'Oreal Corporation? Explain and Justify answer. (Help)
*April 15, 2008*

**word unscramble in french**

dinertroua
*March 11, 2008*

**FRENCH**

can you please look it over again? Thanks! Le Grinch restant (n/s: the remaining Grinch) a indiqué que Markey le (the remaining Grinch signaled Markey to follow him) suivre et il l’a conduit à une pièce avec aucunes (with no windows and no floors) fen...
*October 29, 2007*

**FRENCH**

Last part of the story.. can someone proofread? Thanks! Especially to SraJMcGin! Le Grinch restant a indiqué Markey le suivre et il l’a conduit à une pièce avec aucunes fenêtres et aucuns sols. La pièce était remplie à ras ...
*October 29, 2007*

**FRENCH**

Here is what I have after I fixed the mistakes: Après un certain temps, Bugs Bunny a surgi et il a dit « Quoi de neuf, docteur? » Lorsque Markey lui a rapporté qu'il recherche les trésors de la Montagne des Bonbons, le lapin dé...
*October 28, 2007*

**FRENCH**

Can someone PLEASE proofread this? It's due tomorrow... Après un certain temps, Bugs Bunny a surgi et il a dit « Quoi de neuf, docteur? » Lorsque Markey lui a rapporté qu'il recherche les trésors de la Montagne des Bonbons, le lapin d&...
*October 28, 2007*

**FRENCH**

Can someone please proofread this? It's the next part of my story. Thanks! Petit Markey, aventureux comme toujours, a entrepris sur son voyage vers les citrouilles illuminées avec les grands nez anormalement qui ont ressemblé les poires très poilues. ...
*October 28, 2007*

**FRENCH**

The two are the same. You can read either one...
*October 28, 2007*