Friday

February 27, 2015

February 27, 2015

Total # Posts: 66

**biology**

what is one advantage of using e. coli to study bacterial growth rates?
*February 23, 2015*

**microbiology **

e. coli 0157 is a pathogen that cannot ferment sorbitol, a sugar alcohol, to acid whereas the E. coli in our GI tract, a member of the normal flora, can ferment sorbitol to acid. What media would you use to differentiate between these two E. coli strains?
*February 5, 2015*

**math**

if a ball is selected at random from an urn containing two red balls, three white balls and five blue balls, what is the probability that it will be a white ball
*November 10, 2014*

**Biology**

What is the number one birth defect in California?
*October 16, 2014*

**Chemistry**

A mixture consists of 0.52g of X, 0.77g of Y,and 1.11 g o fZ. What is the mass % of Z in the mixture?
*May 5, 2014*

**chemistry**

Pasta packages often have different direction for cooking at high altitudes. a.) According to the directions, should you boil the pasta for a longer to shorter time? Why? b.) If the pasta water boils rapidly over medium-high heat, is there any reason to turn the heat up all ...
*May 4, 2014*

**chemistry**

We calculated that 30.0 grams of ice initially at -10.0 Celsius and it requires 23.1 kj of energy to bring it all the way to a boil. How much additional energy does it take to convert all of the water to steam at 100 degree Celsius? How does this compare to what we calculated ...
*May 4, 2014*

**Math**

Tim deposits $10 every month into retirement account which averages 18% interest compounded monthly. How much will be in this account after 45 years? (The number of years from age 20 to 65).
*April 23, 2014*

**Math**

Earl Watkins is ready to retire and has saved up $250,000 for that purpose. He places all of this money into an account which will pay him annual payments for 20 years. How large will these annual payments be if the account earns 17% compounded annually?
*April 23, 2014*

**Math**

Andy needs to pay off a loan of $18,000 in 5 years. Find the amortization payment he would need to take each semi-monthly pay period (twice a month) at 6% compounded bi-monthly, in order to pay off the loan.
*April 22, 2014*

**Math**

Angie needs to have an annuity payment of $1,300 at the end of each year for the next 10 years. How much should she deposit now at 10% interest compounded annually, to yield this payment?
*April 22, 2014*

**math**

Earl Watkins is ready to retired and has saved up $250,000 for that purpose. He places all of this money into an account which will pay him annual payments for 20 years. How large will these annual payments be if the account earns 17% compounded annually?
*April 22, 2014*

**Math**

Angie needs to have $15,000 at the end of 6 years. How much should she deposit weekly into an ordinary annuity if it earns 6.5% interest compounded weekly?
*April 22, 2014*

**Math**

Chris and Carol just bought a $14,000 van and financed it for 5 years at 7% interest. What are the monthly payments?
*April 22, 2014*

**Math**

Young and Company owes bond holders $5,500 interest at the end of each quarter for the next five years. How much they deposit now at 8% interest compounded quarterly to yield an annuity payment of $5,500?
*April 22, 2014*

**Math**

Tim deposits $10 every month into a retirement account which averages 18% interest compounded monthly. How much will be in this account after 45 years? (The number of years form age 20 to 65))
*April 17, 2014*

**Math**

Barbara invested $12,300 at the Midtown Credit Union at 6% compounded monthly for 7 years. What is the effect rate of this investment?
*April 17, 2014*

**Chemistry**

If 0.50L of gaseous CH4 is burned at STP, what volume of O2 is required for complete combustion? Methane burns in oxygen to produce CO2 and H2O CH4(g) + 2O2(g) --> 2H2O(l) + CO2(g) And what volume of CO2 is produced?
*April 12, 2014*

**Chemistry **

If a particular reaction evolves 192 kJ of heat while expanding from 1.00 L to 2.00 L at 125 atm of pressure, what is the overall energy change for the system?
*April 12, 2014*

**chemistry**

what about the delta H?
*April 12, 2014*

**chemistry **

If a particular reaction absorbs 252 kJ of heat while doing 105 kJ of work at constant pressure. What are the ΔE and ΔH for values for the reaction? Is the reaction endothermic or exothermic?
*April 12, 2014*

**Finance**

Joe and Sue invested $1500 at Bank America in 2000, at 4% compounded quarterly. In the year 2005 they moved to another city and took the total money from their first investment added $500 and invested it at Bank Bravo, at 5% compounded quarterly. a. What is the value of this ...
*April 11, 2014*

**Chemistry **

A piece of metal weighing 5.10g at a temperature of 48.6 degree Celsius was placed in a calorimeter in 20.00 mL of water at 22.1 degree Celsius. The final equilibrium temperature was found to be 29.2 degree celsius. What is the specific heat of the metal?
*April 7, 2014*

**chemistry**

the lattice energy for MgCl2 is -2326 kj/mol, which is much higher than that for NaCl which has a lattice energy of -786 kj/mol. Why is this so? Give at least two contributing factors.
*April 3, 2014*

**chemistry**

what is z effective? Rb+ Al3+ Mg2+ Na+ out of this set which ion is the smallest? which is the largest?
*April 3, 2014*

**chemistry**

How many different N-O bond lengths would you expect to observe in the actual structure of NO3− and why?
*April 3, 2014*

**chemistry**

its the ABn molecules, which is related to VSPER
*March 31, 2014*

**chemistry**

what are the favored geometrical arrangements for abn molecules which the A atom has 2, 3, 4, 5 and 6 pairs of electrons in its valence shell?
*March 31, 2014*

**chemistry**

what is the hybridization of each atom for hydrocyanic acid?
*March 29, 2014*

**chemistry**

can you give me the website?
*March 29, 2014*

**chemistry**

what is the lewis structure for N-bromosuccinimide?
*March 29, 2014*

**Chemistry**

@DrBob222: what about the sodium phosphate?
*March 25, 2014*

**Chemistry **

Calcium can also be precipitated out of the solution by adding sodium phosphate (Na3PO4) to form solid calcium phosphate. A.) write a net ionic equation for this process B.)calculate the mass of this precipitate you would generate from treating 1.000 L of your unknown sample ...
*March 25, 2014*

**chemistry**

Based on your titration of the 150ppm standard solution of Ca2+ calculate the molarity of the EDTA solution we used, which is Ca2+ + EDTA4- ----> [CA(EDTA)]2-
*March 25, 2014*

**Math**

An air conditioning salesperson receives a base salary of $2850 per month plus a commission. The commission is 2% of the sales up to and including $25,000 for the month and 5% of the sales over $25,000 for the month. a. Write a piecewise function that relates the salesperson ...
*January 28, 2014*

**write**

the question is what has changed now that you are in school? can you give me a idea how to write this question?
*June 8, 2012*

**write**

can you give me an idea how write?
*June 8, 2012*

**write**

my question is what obstacles do i have to overcome to succeed?
*June 8, 2012*

**math**

Solution for 2/3x+x+90=180
*February 27, 2012*

**Math**

How do you do asymptoes or what ever you call them? and how do you do the equations for the different graphs for transformation?
*October 10, 2011*

**Drama**

can we consider breaking the glass menagerie twice in the play of " The Glass Menagerie" by Tennesse William a framing device??
*June 14, 2011*

**Drama**

what are the literay techniques found in a play, a novel, a short story or a poem ?
*June 14, 2011*

**Essay writing**

how to narrow down a topic about the Egyptian Revolution of 25 January for an argumentative essay??
*June 11, 2011*

**English**

"The boat is made of paper." Why is the made in the past tense in this sentence? What kind of grammar is this?
*June 8, 2011*

**Language Art**

I saw a young girl (stealing, stole, steal, steals) something from the shop. which answer should it be and why?
*June 5, 2011*

**Calculus**

Explain how you would use the power integration formula to integrate the function f(x) = (1/x^2)-(1/x)+(1/4).
*May 22, 2011*

**Math**

Four candidates are running for president of the student council. three other candidates are running for vice-president. how many different ways can the two offices be filled?
*April 19, 2011*

**math**

i don't know if i can do it...
*March 29, 2011*

**math**

There are fifty marbles in a sack: red, blue and green. There are ten more green than blue marbles in the sack. The probability of drawing a red or blue marble is one-half. Write and solve an equation to determine how many of each color marble is in the sack
*March 29, 2011*

**Math**

What is the median of this set? {π, √25, 15%, √15, 10/4}
*March 29, 2011*

**Math**

The mean weight of 75 2nd graders is 55.7 lbs and the mean weight of 25 1st graders is 42.6 lb. What is the mean weight of the 100 children
*March 28, 2011*

**English**

whathappens to derek and roy's vow not to speak to bolivia?what do they learn from what happened?inthe story hot and cold summer
*February 2, 2011*

**Chemistry**

Calculate q when 0.10 g of ice is cooled from 10 degrees C to -75 degrees C (C ice= 2.087 J/ g* K)
*October 20, 2010*

**Math**

Hi, what is the gradient of a line that has an angle of inclination of 75°? Any help appreciated
*August 14, 2010*

**grammar**

Is this sentence correct? She has never been missed her homework.
*May 17, 2010*

**Math Help- Gr12**

opps, im sorry.. its suppose to be D = (3/2)logk - 0.7
*January 18, 2010*

**Math Help- Gr12**

The relation between the # of time in days, D, it takes for a planet to revolve around the Sun is related to the planer's average distance from the Sun, k, in millions of kilometres is defined by log D= 3/2logk-0.7 . How much longer does it take Mars than Venus to orbit ...
*January 18, 2010*

**Advanced Functions math**

The original question was what i needed to solve, but with the way i changed it, is it correct?
*January 18, 2010*

**college: Chemistry**

I need help on this homework problem and I do not understand how to work on it. Please help me with this problem. The photoelectric work function of a metal is the minimum energy needed to eject an electron by irradiating the metal with light. For calcium, this work function ...
*February 15, 2009*

**College: Chemistry**

Hi there, I need help on my homework for chemistry and I do not understand the step on how to work this problem out. Please help me with this problem: On a Sunday morning while having your breakfast you determine that you need about 2.95X10^(5)J to heat water for your tea in ...
*February 15, 2009*

**microbiology**

Can someone help me to answer this question please. What is the sequence of the last anticodon? What is its corresponding codon in the nontemplate strand of DNA including polarity.
*October 29, 2008*

**accountiing**

using the financial statements of landry's restaurant located in appendix a of the text fundamentals of financial accounting 1st ed by phillips libby and libby compute teh following ratios for 2002 and 2003 a. earnings per share b. return on assets c. current ratio d. ...
*August 26, 2008*

**Statistics**

State the main points of the Central Limit Theorem for a mean.
*June 24, 2008*

**French-how to make accents**

How do u do Mme in frenc? small letters
*March 22, 2008*

**Biology**

Compare the functions of a normal cell and that of a cancer cell with regards to cell division. Discuss the cell cycle control system and checkpoints and how these might be altered in a cancer cell.
*November 5, 2007*

**Algebra**

There are two questions that I am having trouble with one says Emily wants 400 ml of a solution that is 11% HC1. If she has only 8% HC1 and 16% HC1, how much of each should she use? and On a trip, Debbie spent as much time on the train as she id on the bus. THe train averaged ...
*September 16, 2007*

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