Saturday

September 20, 2014

September 20, 2014

Total # Posts: 197

**Bio Chem**

Carbonate is commonly used to buffer household detergent solutions to a pH of 9.0. How many grams on NaHCO3 and how many grans of NA2CO3 are needed to prepare 0.75L of a 100mM solution? The 2nd pKa of carbonic acid is 10.33.
*September 4, 2014*

**Math**

(-10)exponent is 2
*May 17, 2014*

**ap statistics**

Which of the following is not correct? A. The rejection region is controlled by the alpha level and the alternate hypothesis. B. The p-value measures the probability that the null hypothesis is true. C. The probability of a Type I error is controlled by the selection of the ...
*April 24, 2014*

**information literacy**

. In the keyword search on EDSeek's Home Page, enter the following statement: NASA* AND Mars*. Based on the results from this search, choose the best answer to this question. Which of the following is not a listed document type?
*April 12, 2014*

**College math**

A and B agree to share the cost of an $18 pizza based on how much each would eat. B ate 3/2 of the pizza that A ate. How much should A and B each pay? A= B= Thank you
*March 20, 2014*

**College Math**

This is my last question, I promise! Use U={1,2,3,4,5,6,7,8,9,10} A={2,3,5} B={5,6,7,9} C={1,4,10} to find the set AUB You guys are awesome!!
*March 18, 2014*

**College math**

Thanks Steve
*March 17, 2014*

**College math**

Help me The product of 4 and y is the sum of 3 and 9
*March 17, 2014*

**College math**

You should have typed "College math??
*March 17, 2014*

**College math**

the lengths of the legs of a right triangle are given: a=10 b=24 c=____? Thank you so much
*March 17, 2014*

**College math**

You are great Damon!!
*March 17, 2014*

**College math**

Which statement describes the quadratic equation 6x^2-4x+1=0,correctly? A. it is one completed real root? B. It is two complete complex roots? C. It is two unequal real roots? Please help me with this
*March 17, 2014*

**College Algebra**

Please, I need your help!How much water must be evaporated from 16oz of a 2% salt solution to make a 4% salt solution?
*March 17, 2014*

**College math**

Find the area and the circumference of a circle of radius 4 meters. Thank you
*March 13, 2014*

**College math**

Thank you Damon. I could not have done this without your help!!
*March 13, 2014*

**College math**

The length of the sides of a triangle are given as 8, 15, 17. The hypotenuse is the side that is the length of ____?
*March 13, 2014*

**PHYSICS**

a) What is the maximum current in a 4.00 µF capacitor when it is connected across a North American electrical outlet having ΔVrms = 120 V, f = 60.0 Hz? mA (b) What is the maximum current when it is connected across a European electrical outlet having ΔVrms = ...
*November 29, 2013*

**physics**

A 19 turn circular coil of wire has diameter 1.09 m. It is placed with its axis along the direction of the Earth's magnetic field of 51.0 µT, and then in 0.195 s it is flipped 180°. An average emf of what magnitude is generated in the coil?
*November 13, 2013*

**physics**

A flat loop of wire consisting of a single turn of cross-sectional area 8.10 cm2 is perpendicular to a magnetic field that increases uniformly in magnitude from 0.500 T to 1.90 T in 0.95 s. What is the resulting induced current if the loop has a resistance of 2.80 ?
*November 13, 2013*

**algebra**

Rita's tuition bill for last semester was $4360 If she paid $6052 in tuition this semester what was the percentage increase on her tuition Please help me as I am not sure of my answer which is 0.38%
*October 24, 2013*

**Chemistry**

How many moles of H2O are in 3.00L of water? (d=1.00g/mL)
*September 23, 2013*

**History**

Political factionalism in the U.S. during the 19th century was fueled by the emergence of a unique American culture and the transition from an agrarian to market economy. Please give me some information on writing about this.
*June 21, 2013*

**social studies**

Political factionalism in the U.S. during the 19th century was fueled by the emergence of a unique American culture and the transition from an agrarian to market economy. How do I start writing about this subject?
*June 10, 2013*

**Science**

0.04 m/s
*May 27, 2013*

**Algebra 1**

can you please explain to me how you got the answer because i have no idea how to do this..
*May 6, 2013*

**Algebra 1**

Factoring Polynomials: 2x to the second power -3x-2 could you please explain to me how to do this.
*May 6, 2013*

**Algebra **

Ground beef sells for $4.75 per kg and ground pork sells for $5.50 per kg. How many kg of ground pork should be mixed with 8 kg of ground beef to make a mixture that sells for $5.10 per kg? I dont know how to set this up or anything. Please help!
*December 12, 2012*

**Algebra**

The second one: 2+3+5+7+11+13+17+19+23+29+31+37+41+43+47+53+59+61+67+71+73=712 Matt The fourth one: 2-9=8 digits 10-99=178 digits 100-200=300 digits 201-300=297 digits 301=3 digits 302=3 digits 303=3 digits 304= 3 digits 8+178+300+297+12= 795 304 pages
*December 5, 2012*

**physics**

convert an acceleration of 4.1 mi/h/s to m/s^2
*October 17, 2012*

**physics**

a 21.2 kg mass attached to a spring scale rests on a smooth, horizontal surface. the spring scale, attached to the front end of a boxcar, reads T=35.6N when the car is in motion. If the spring scale reads zero when the car is at rest, determine the acceleration of the car, ...
*October 17, 2012*

**physics**

If a seagull flies to a height of 22.5 meters, how long will the clam take to fall? The acceleration of gravity is 9.8m/s. answer in units of sec
*October 17, 2012*

**math**

(exponents and roots) Michael wants to fence in a new garden so that the garden has an area of 625 square feet. If his garden is in the shape of a square, what is the length of each side?
*September 18, 2012*

**Social Studies**

To survive in different areas, native people had to learn to?
*September 6, 2012*

**Health**

C. Environment and genetic factors
*August 30, 2012*

**algebra1**

A rule of thumb states that the ideal weight (in ounces) of a baseball bat for a high school player is 5 ounces more than one third of the player's height (in inches). Write an expression that describes the ideal weight in ounces of a bat for a high school player who is h ...
*August 15, 2012*

**Math**

The Pew Research Center recently polled n= 1048 U.S drivers andfound that 69% enjoyed driving their automobiles. (a) Construct a 95% confidence interval for the proportion of U.S.drivers who enjoy driving their automobiles. (b) In 1991, Gallup Poll reported this percent to be ...
*May 1, 2012*

**physics**

State how the centripetal force is provided in the case of a satelite orbiting the earth
*April 8, 2012*

**Chemsitry**

Starting out with 50 mL of 0.20 M NaHCO3, calculate how many mL of 0.50 M NaOH solution to add to make 100 mL of approximately 0.10 M (total) buffer solution with a pH of 10.35. By adding NaOH, some of the NaHCO3 gets converted to the conjugate Na2CO3. This conjugate acid/base...
*April 2, 2012*

**Chemsitry**

A chemist needs to make 50 mL buffer solution with a pH value of 7.25 using the acid/conjugate base pair of KH2PO4 and Na2HPO4 (which has an effective pKa = 6.86). The buffer solution needs to be made so that the total concentration of buffer is 0.10 M (that is, [acid] + [base...
*April 2, 2012*

**Chemsitry**

Tris is an abbreviation for tris (hydroxymethyl) aminomethane, which is a weak base. Calculate how many grams of tris (mw=121.14g/mol) are needed to make 25mL of 0.10M tris solution. Calculate how many mL of 0.25M HCl are needed to convert half of the moles of tris present in ...
*April 2, 2012*

**pre-algebra**

oh you dont have to worry about it.
*March 15, 2012*

**pre-algebra**

thomas borrowed $4800 to buy a new car. he will be paying $96 each month for the next 60 months. find the simple interest rate for his car loan.
*March 15, 2012*

**Pre-algebra**

thank you!
*March 15, 2012*

**Pre-algebra**

i got 216 would that be right?
*March 15, 2012*

**Pre-algebra**

$1200 at 6% for 36 months
*March 15, 2012*

**Chemistry**

A student has 100.0 mL of an unknown solution of Vitamin C. She removes 1.00 mL of this solution, dilutes it to 50.0 mL, and titrates this second solution with an iodine solution solution that 8.5x1^-4 M. 6.60 mL of iodine solution is required to reach the endpoint. 1. How ...
*March 12, 2012*

**Chemistry**

in step 2 aren't you supposed to divide by the molar mass of vitamin C (176.12)?
*March 12, 2012*

**Chemistry**

would 5.61x10^-5 make sense for the molarity for the original unknown sample of vit C solution prior to dilution?
*March 12, 2012*

**Chemistry**

Nevermind. i figure it out. Thank you so much for your help!
*March 12, 2012*

**Chemistry**

to find the molarity of the original vit C do you just divide the moles found in 1 divided by 0.001 L or 1.0 mL?
*March 12, 2012*

**Chemistry**

to find the total moles of iodine, do you just multiple 8.5x10^-4 by .00660 L?
*March 12, 2012*

**Chemistry**

we are not given the molar mass of the vit. C. how are we supposed to find the milligrams of vit C are in the orginal sample?
*March 12, 2012*

**Chemistry**

A student has 100.0 mL of an unknown solution of Vitamin C. She removes 1.00 mL of this solution, dilutes it to 50.0 mL, and titrates this second solution with an iodine solution solution that 8.5x1^-4 M. 6.60 mL of iodine solution is required to reach the endpoint. 1. How ...
*March 12, 2012*

**physics**

The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.60 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 2.34 m from ...
*February 28, 2012*

**Chemistry**

Then calculate the inital ClO^- concencentrations for 1st, 2nd, and 3rd reactions. Calculate [ClO^-] in a 6% bleach solution. A 6% bleach solution contains 6 grams of NaClO per 100 grams bleach. The density of 6% bleach is 1.07g/mL. Chemical reaction: Blue dye + ClO^- -->...
*February 28, 2012*

**Chemistry**

Then calculate the inital ClO^- concencentrations for 1st, 2nd, and 3rd reactions. Chemical reaction: Blue dye + ClO^- -->oxidized dye +Cl^- Reaction #1: 5.0 mL or diluted bleach solution, 15.0mL of distilled water, 10.0 mL of diluted blue dye Reaction #2: 10.0mL of diluted...
*February 27, 2012*

**Chemistry**

Calculate [ClO^-] in a 6% bleach solution. A 6% bleach solution contains 6 grams of NaClO per 100 grams bleach. The density of 6% bleach is 1.07g/mL.
*February 27, 2012*

**Chemistry**

Calculate [ClO^-] in a 6% bleach solution. A 6% bleach solution contains 6 grams of NaClO per 100 grams bleach. The density of 6% bleach is 1.07g/mL.
*February 27, 2012*

**physics**

An object is thrown upwards and after 2 seconds is 78 m above where it was initially thrown. Assume no air resistance, and determine the initial speed the object was thrown at.
*February 21, 2012*

**math **

7k-8k=1 how would you do this?
*December 13, 2011*

**math **

thank you
*November 30, 2011*

**math **

3(x+ -5)+7(x+2)
*November 30, 2011*

**math **

after i looked at it a couple times i figured it out how you did it thank you(:
*November 30, 2011*

**math **

can you please explain this..
*November 30, 2011*

**math **

4+9c+3(c+2)
*November 30, 2011*

**media**

Huge corporations own every television network and most other media outlets. How does this affect their news coverage? How much influence do you think these corporations have on the public? Do you think the public is aware of the comments made by you and your classmates? (...
*November 16, 2011*

**discussion**

What is the difference between current sources and relevant sources? Is it possible a source might fit one category, but not the other? How?
*November 11, 2011*

**COM 156**

What websites do you normally frequent? Are these websites credible? When is credibility more important and when is it less important? Support your answers with specific examples
*November 8, 2011*

**science**

How is the temperature of a substance related to the energy of movement of the particles in the substance?
*October 12, 2011*

**social studies**

Thank you so much
*October 12, 2011*

**social studies**

C) cities...This was my second choice. Am I right?
*October 12, 2011*

**social studies**

In Korea, Modern ways are much more visible in? a)villages b)communes c)cities d)farming communities I picked B Communes but not sure
*October 12, 2011*

**Science**

what is the net ionic equation for: Mn+Ni(NO3)2 -> Mn(NO3)2+Ni Is the answer no reaction or is Nickel considered a state change??
*October 10, 2011*

**PHYSICS**

Given: The initial position of the block is the origin; i.e., x = 0 at t = 0 . Consider down the track to be the positive x-direction. A block with an initial velocity v0 slides up and back down a frictionless incline. Which graph best represents a description of the velocity ...
*October 2, 2011*

**math**

so would it be 12x15? 12x20 ? etc...
*September 14, 2011*

**math**

TILING A decroative floor pattern has one red square tile surrounded by 12 blue tiles. Write and evaluate an expression to show how many total tiles (red and blue) are needed if there are 15 red tiles. Then make a table showing the total number of tiles if there are 15,20,25, ...
*September 14, 2011*

**math**

6+4(3)
*September 14, 2011*

**math**

Thank You so much!
*September 12, 2011*

**math**

2[(10-3) + 6(5)] = what? I can up with 74
*September 12, 2011*

**Statistics**

Each year, approximately 160 colleges compete in the National Concrete Canoe Competition. Each team must design a seaworthy canoe froma a substance not known for its capacity to float. The canoes must weigh between 100 and 350 pounds. Find the midrange.
*August 12, 2011*

**geometry**

Find the area of the parallelogram that has coordinates of A(-2,2), B(-4,-2), C(2,-2), and D(4,2). Find the base and height first.
*June 26, 2011*

**english **

i not sure micheal jordan and john miltion for the second one
*June 22, 2011*

**english **

4.Type the appositive(s) in each sentence. You do not need to include the commas. The famous basketball player Michael Jordan was known for his performance under pressure. 5. Type the appositive(s) in each sentence. You do not need to include the commas. A brilliant poet, John...
*June 22, 2011*

**^^Brand Extension^^**

okay. but i dont want that example from wikipedia. I want something else. is there another food item example you give to me plese?
*May 19, 2011*

**^^Brand Extension^^**

wat does brand extension mean? cud u give me an example? Brand extension or brand stretching is a marketing strategy in which a firm marketing a product with a well-developed image uses the same brand name in a different product category. The new product is called a spin-off. ...
*May 19, 2011*

**^^Brand Extension^^**

wat????? me no understand^^
*May 17, 2011*

**^^Brand Extension^^**

wat does brand extension mean? cud u give me an example?
*May 17, 2011*

**geometry**

it is recommended that for a height of 20 inches,a wheelchair ramp be 19 feet long.what is the value of x to the nearest tenth>
*May 15, 2011*

**math**

7 - (-15) equals?
*May 2, 2011*

**math**

7 minus -15 equals? would that be a -8?
*May 2, 2011*

**math**

thank you
*May 2, 2011*

**math**

-1 minus 8 equals? is 7 the correct answer
*May 2, 2011*

**math **

thank you so much
*May 1, 2011*

**math **

The temperature at 1:00 p.m. was 88 degrees farenheight. This was 12degrees warmer then at 8:00 a.m. Earlier on the same day, the temperature fell 7 degrees farenheight from midnight to 4:00 a.m. Then it rose 6 degrees farenheight from 4:00 a.m. to 8:00 a.m. What was the ...
*May 1, 2011*

**math **

thank you
*April 26, 2011*

**math **

does a -8 plus -7 equal 15 then?
*April 26, 2011*

**math**

Thank you...after awhile of doing these I start to get confused so I wrote it down now. Thanks again.
*April 26, 2011*

**math**

ok..and a negative times a positive is a negative and the same for dividing a negative by a positive it is always negative?
*April 26, 2011*

**math**

can you just clear this up for me... a negative times a negative is a positive? a negative divided by a negative is a positive also?
*April 26, 2011*

**math**

thank you
*April 26, 2011*