# Posts by sandra

Total # Posts: 1,141

**math**

A hiker travels N 33 degrees W for 15km, then turns 90 degrees and walks 12km in the direction S 57 degrees W At that time how far is the hiker from his starting point? What is his bearing from his starting point?

*January 10, 2012*

**chemistry**

By reference to Molecular orbital Theory and giving the appropriate MO diagrams explain why the bond in N2 is very strong short (bond dissociation entalpy 945 kjmol-1,bond length 109.8 pm) while that in O2 is weaker and longer (bond dissociation entalpy 497 kJ mol-1 bond ...

*December 22, 2011*

**chemistry**

By reference to Molecular orbital Theory and giving the appropriate MO diagrams explain why the bond in N2 is very strong short (bond dissociation entalpy 945 kjmol-1,bond length 109.8 pm) while that in O2 is weaker and longer (bond dissociation entalpy 497 kJ mol bond length ...

*December 21, 2011*

**Pre-Calc-Please check answer**

Thank you-I see where I made the mistake Funny!! I like that!

*December 15, 2011*

**Pre-Calc-Please check answer**

Should be sigma sign not signma sign

*December 15, 2011*

**Pre-Calc-Please check answer**

1.Write 4+6+8+10 in sigma notation: I came up with sigma in the middle 3 on top j=0 on the bottom 2n+4 to the right of the signma sign 2. Find the 10th term of the sequence -1/5,-1/20,-1/80 this was a geometric sequence so I said a(subscript10) = -1/5*1/4^(10-1) =-1/5*(1/4)^9...

*December 15, 2011*

**Pre-Calc-Please check answer**

1.Write 4+6+8+10 in sigma notation: I came up with sigma in the middle 3 on top j=0 on the bottom 2n+4 to the right of the signma sign 2. Find the 10th term of the sequence -1/5,-1/20,-1/80 this was a geometric sequence so I said a(subscript10) = -1/5*1/4^(10-1) =-1/5*(1/4)^9...

*December 15, 2011*

**Pre-Calc-Please check**

1.Write 4+6+8+10 in sigma notation: I came up with sigma in the middle 3 on top j=0 on the bottom 2. Find the 10th term of the sequence -1/5,-1/20,-1/80 this was a geometric sequence so I said a(subscript10) = -1/5*1/4^(10-1) =-1/5*(1/4)^9 = -1/5*1/2621444 = -1/1310702

*December 15, 2011*

**chemistry**

Suppose that the following solution is diluted by adding the indicated amount of water. Calculate the new concentration of 225 mL of 3.02 M HCl; 375 mL water added

*December 4, 2011*

**math**

Would you use mental math to solve 2984+1997+406? Explain?

*November 22, 2011*

**Math**

Explain how you can estimate to tell whether 433-147=286 is reasonable.

*November 17, 2011*

**Math**

Explain how you can estimate to tell whether 433-147=286 is reasonable.

*November 17, 2011*

**math**

Patricia estimated that 439 - 186 would be close to 300. Do you agree? Explain and solve the problem.

*November 17, 2011*

**Math**

thank you

*November 14, 2011*

**Math**

Heidi says 381= 2 hundreds, 7 tens, 11 ones. Do you agree? Explain.

*November 14, 2011*

**Economics**

If a firm temporarily suspends production due to matters of financial loss, is a shutdown of business, if a firm opts to “go out-of-business” primarily due to continual financial losses the business is inoperable and no longer conducting transactions. My firm ...

*November 9, 2011*

**math**

If you estimate to the nearest 5 or 10 it is easier to add.

*November 7, 2011*

**Chemistry**

What is the molecular weight of 30% aqueous nitric acid?

*November 7, 2011*

**CHEMESTRY**

Which of the following solutions would have the lowest boiling point? A.1.0 M NaCl B.2.0 M NaCl C.3.0 M NaCl D.4.0 M NaCl

*November 3, 2011*

**psychology**

The testing company has hired qualified people in the field to administer the new test bank to subjects of different ages and ethnic backgrounds.They need a sizeable number of scores from inner city,urban,and country/small town subjects.Their goal is to gather suffiecient data...

*November 2, 2011*

**Math**

Explain why one column in a hundredths grid is equal to one column in a tenths grid?

*November 1, 2011*

**math**

THANK YOU

*October 27, 2011*

**math**

hector music teacher requires 450 min of practice each month. Hector practiced 239 min the first three weeks this month. Estimate how many minutes he has left to practice.

*October 27, 2011*

**IT**

What steps would you take in diagnosing an application that has been changed from its original state? How does this affect the level of support required to facilitate Microsoft® Access® users? I need this for my college paper. Thanks

*October 25, 2011*

**IT**

What steps would you take in diagnosing an application that has been changed from its original state? How does this affect the level of support required to facilitate Microsoft® Access® users?

*October 25, 2011*

**math**

Is it reasonable to say the sum of 146 and 149 is less than 300? Explain.

*October 24, 2011*

**physics**

no, that's all he posted.

*October 22, 2011*

**physics**

A car is connected to a tree by a length of rope tied tightly. A 115 pound woman steps in the middle of the rope causing it to deflect by 15 degrees.

*October 22, 2011*

**math**

Jonah wants to add 43+19. He added 43+20. What step should he take next?

*October 19, 2011*

**Math**

Thank you

*October 19, 2011*

**Math**

Miles says 47+36 is the same as 50+33. Is this reasonable? Explain.

*October 19, 2011*

**statistics**

Considering that a researcher can test at the <p = .05 (95%), p = .01 (99%), or p = .001 (99.9%) level for statistical significance, how would you use these three levels in relationship to risk to patients in implementing the decisions of your research?

*October 18, 2011*

**Math 3 grade**

40+3

*October 17, 2011*

**HRM/498**

One paragraph identifying and describing the diversity consideration and the impact it is having on one or more aspects of a company's strategic HR planning process.

*October 16, 2011*

**HRM/498**

One paragraph identifying and describing the ethical consideration and the impact it is having on one or more aspects of a company's strategic HR planning process.

*October 16, 2011*

**Math**

9 days x 1/2 hour = 9/2 Now divide 9/2 = 4 1/2 Answer: 4 1/2 (improper fraction) 9/2 ( mixed fraction)

*October 13, 2011*

**math stats**

four times the difference of -19 and 3 amounts to -88

*October 3, 2011*

**physics**

a 10kg wood ball hangs from a 1.1 m long wire. The maximum tension the wire can withstand without breaking is 600N. a .9 kg projectile traveling horizontally hits and embeds itself in the wood ball. What is the largest speed the the projectile can have before the cable breaks

*October 2, 2011*

**algebra**

jopfjqopegfjq

*October 1, 2011*

**Anatomy**

I have a question: The process that traps solids in the cell membrane and brings them into the cell is which of the following:I'm almost positive it i pinocytosis, correct? pinocytoais phagocytosis ion pumps

*September 28, 2011*

**Chemistry**

Cryolite, Na3AlF6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation: Al2O3(s) + NaOH(l) + HF(g) -> Na3AlF6 + H2O(g) If 14.0 kilograms of Al2O3(s), 57.4 kilograms of NaOh(l), and 57.4 kilograms of HF(g) react ...

*September 18, 2011*

**STATS**

The top selling Red and Voss tire is rated 70,000 miles means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a mean of 82,000 miles and a standard deviation of 6,400. a. What is the probability that a tire ...

*September 16, 2011*

**science**

The making of the nuclear reactor was an advance in

*September 16, 2011*

**Biochem**

Desribe the preparation of 2.00 L of 0.100M pH 9.00 glycine starting with the sodium chloride salt of zwitterionic glycinhe and 1.00M NaOh. If a reaction that generated 2.00 mmoles of base were carried out in 100 mL of the above buffer, what would be the final solution pH? ( ...

*September 13, 2011*

**algebra**

Find the length of each kind of shark. The white Shark is 18ft long. The oceanic whitetip shark is 2/3 the length of the tiger shark.

*September 11, 2011*

**Spanish**

Thank you for answering

*September 8, 2011*

**Spanish**

So I didn't mean to put Te llamo Isabel as the usual way, I meant to say Me llamo Isable is the way I think we put it because that wouldn't involve reflexive in this case, I don't think.

*September 8, 2011*

**Spanish**

Hi we just relexive verbs and I'm already stuck Please check this answer ¿Cómo te llamas? 1. Me llamas Isabel 2.Te llamas Isabel 3.Te llamo Isabel 4.Me llamo Isabel Would it be "Me llamo Isabel?" because Te llamo Isabel is the usual way Also Te ...

*September 8, 2011*

**Pre-Calculus**

I can answer my own question-NO yours makes more sense. Its the first day of these so I'm still alittle confused. Thank you for helping

*September 1, 2011*

**Pre-Calculus**

I came up with (x+5)(x+6) = 0 x^2 - 11x + 30 = 0 Would that also be correct? Thank you for helping

*September 1, 2011*

**Pre-Calculus**

I need to write a polynomial of the smallest degree with roots 5 and 6 and the answer can't have parentheses. Can someone point me in the right direction. I have several of these to do.

*September 1, 2011*

**physics**

You are driving south on a highway. Then, without changing speed, you round a curve and drive west. Do you accelerate?

*August 31, 2011*

**physics**

You are driving north on a highway. Then, without changing speed, you round a curve and drive east. Does your velocity change?

*August 31, 2011*

**maths**

the diameter of a wheel is 84cm? How far it travels in one turn?

*August 30, 2011*

**ETH125**

what changes has the US made to certain polices concerning the treatment of Muslims and Arabs?

*August 25, 2011*

**geology**

How do oceans regulate climate?

*August 2, 2011*

**Math**

Suppose the interest rate is 8% APR with monthly compounding. What is the present value o an annuity that pays $90 every 6 months for 5 years?

*July 14, 2011*

**Med terms**

I find nine(9)words, but I need ten (10) I do not know what I am missing. But I am missing a word and place my finger on it. Dob chronic obstructive pulmonary disease (COPD) aphonia sputum apnea days dyspnea paroxysm ventilator So what is I missing here?!

*July 12, 2011*

**educational statics**

how often does the university admit an exception student with a SAT score of x =700 or above Asample of 36 students (N)- 36 were randomly selected with mean (=11,and standard deviation (x=12. the sample mean score X=9.

*July 10, 2011*

**educational statics**

the average SAT score at a local university is (=60, and standard is (x=50. Assume that the university SAT score has a normal distribution convert a student score x=700 into z score

*July 10, 2011*

**algebra 2**

1) In the general second-degree equation Ax^2 + Bxy + Cy^2 + Dx + Ey = F = 0, what is the discriminant and what does it tell you about the graph of the equation? 2) Which terms in a general second-degree equation (Ax^2 + Bxy + Cy^2 + Dx + Ey = F = 0) are used to find the ...

*July 10, 2011*

**stats**

For a normal distribution where mx= 80 and sx= 10, the distribution model fits well to test scores of N = 20000 students.

*July 10, 2011*

**business communication**

A~handwritten applications

*June 19, 2011*

**MATH**

3 PIZZAS WERE EACH CUT INTO 8 PIECES. TEN OF THE PIECES WERE EATEN FOR LUNCH

*May 29, 2011*

**Pre-Cal**

From a point 50 feet in front of a church, the angle of elevation to the top of the steeple is 48 degrees. Find the overall height of the church and steeple.

*May 23, 2011*

**algebra**

a number is represented by the variable x at least is represented by the ≥ symbol and the last part of the inequality is 15 so the answer is x ≥ 15

*May 19, 2011*

**math**

what is 25 more than 5 times and number and x

*April 29, 2011*

**Mathematical for Educators 1**

Jim bought two shirts that were originally marked at $40 each. One shirt was discounted 20% and the other was discounted 25%. The sales tax was 4.5%. How much did he spend in all

*April 21, 2011*

**English**

what is the simple predicate in the sentence, I could hear the wind blow through.

*April 18, 2011*

**math**

What are the steps to the solution for this problem? What is the difference between 330 and half n equals 114?

*April 13, 2011*

**PENN-FOSTER**

that not what i said you are not making it clearer you are putting words in my mought i look at some one else question she was asking for the anser not help that the one back you should be on not mine because like i said i did not know about this my daughter told me they can ...

*April 11, 2011*

**PENN-FOSTER**

like i said this is my first time on this web page so i did not understand she said let ask them the question because they will help you with the ones you having trouble with i did not just want the anser i taught someone who took it already could explane it better let not ...

*April 11, 2011*

**PENN-FOSTER**

ok i did not know my daughter just told me to go to this web sit and ask any way thank you i did not want th anser i said i was having problems with does questions

*April 11, 2011*

**PENN-FOSTER**

i am not beeing rude i am just not to good with the computer you are been rud i would i would like to know your name and i am not cheating every body bask questions that wat the web site is for thank you

*April 11, 2011*

**PENN-FOSTER**

HI I AM NOW DOING FACILITIES AND STAFF BUT I AM HAVING SOME STRUGGLES WITH NUMBERS 8,9,10, 11,12 I AM ASKING SOME ONE WHO TOOK THIS CLASS TO PLEASE HELP ME

*April 11, 2011*

**chemistry**

a 5.0 dm3 sample of oxygen at a pressure of 200 kPa and 2.0 dm3 sample of nitrogen at a pressure of 500 kPa are introduced into a 2.5 dm3 vessel. what is the total pressure in the vessel?

*April 10, 2011*

**introduction to accounting**

a merchandising company wants to include the cost of operating its warehouse in the cost of inventory. The company’s controller argues that the cost of the warehouse is a reasonable and necessary cost of getting the inventory ready for sale and, therefore, should be ...

*April 7, 2011*

**statistics**

5. Congressional Committee Memberships The composition of the 108th Congress is 51 Republicans, 48 Democrats, and 1 Independent. A committee on aid to higher education is to be formed with 3 Senators to be chosen at random to head the committee. Find the probability that the ...

*March 24, 2011*

**Algrebra 1**

x2(squared)-12=-x solve by completing the square

*March 20, 2011*

**Chemistry**

Thanks a lot! I realized that I forgot to account for the volume change when I calculated my molarities for the base and the acid, and that was enough to get the pH off by 0.01.

*March 18, 2011*

**Chemistry**

Okay, so I found the ion concentrations through the Henderson-Hasselbalch equation, and the concentrations I got: [Acetic Acid] = 0.036525666 [Acetate] = 0.063474334 I got the same concentrations as when I did my ice chart, and I also got the same delta pH, which was -0.266.

*March 18, 2011*

**Chemistry**

Here's what I did: So I set values for: [Acetic Acid] = y [H3O+] = 10^-5 [Acetate] = 0.1M - y Ka = 10^-4.76 And from the equation: Ka = [Acetate][H3O+]/[Acetic Acid], I found y, or the molarity of acetic acid, to be 10^-6/(10^-5 + 10^-7.46). And from this, I also got the ...

*March 18, 2011*

**Chemistry**

I did everything from the beginning and I didn't round anything at all until my last step where it told me to round to two decimal places. I still can't get the answer, though

*March 18, 2011*

**Chemistry**

Sorry, I forgot to say that it told me to round it to two decimal places.

*March 18, 2011*

**Chemistry**

A beaker with 100 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 6.10 mL of a 0.260 M HCl solution to the beaker. How much will the pH change? The pKa of acetic ...

*March 18, 2011*

**physics**

10 k r point g point degree

*March 17, 2011*

**English**

Help me write an essay on How I learned English by Gregory Djanikian.

*March 16, 2011*

**astrology of GEO PHYSICS**

3 point 666 point one fifth degree

*March 13, 2011*

**algebra**

It takes 7 hours for Will to paint a house. Judy can paint the same house in 3 hours. How long will it take them to paint the house if they work together?

*March 11, 2011*

**math**

2.75 divided by 1000

*March 8, 2011*

**Com/171**

What is wrong with this sentence: The diplomats are doing what they can to restore peace.

*February 28, 2011*

**Com/171**

Your welcome. I was happy to help.

*February 28, 2011*

**physics**

Consider a 1kg mass at rest at the equator.Because of the earths rotation , the mass experiences a centripetal acceleration. a)Draw free body diagram of mass b)Find centripetal force acting in the mass c)Compare apparent weight and true weight d)what fictitious force would the...

*February 24, 2011*

**math**

7x9=63

*February 24, 2011*

**chemistry**

What is the approximate thermal energy in kJ/mol of molecules at 275° C

*February 23, 2011*

**applied statistics**

Discuss how the General Linear Model assigns the optimal “weights” to predictor variables that allow us to maximize prediction accuracy. How are discriminant functions the optimal weighted linear composites for predicting “membership” regarding the ...

*February 20, 2011*

**Science**

If the moon rotated on its axis just as quickly as Earth's, would we always see the same side of the moon? Explain. -thanks, Sandra

*February 19, 2011*

**Office Management**

One taxicab charges 75 cents for the first quarter-mile and 15 cents for each additional mile. The competing taxi company charges $1.00 for the first quarter-mile and 10 cents for each additional mile. 1. what distance would produce the same fare for the two taxi companies? 2...

*February 17, 2011*

**Science**

the answer is B

*February 16, 2011*

**Science**

when comparing the force that is required to climb a mountain walking up a trail that slopes gently upward to the top verses getting there by scaling a sheer vertical face, which of the following is true? (a) you use more force for a giving movement on the walk than on the ...

*February 16, 2011*