# Posts by jessica

Total # Posts: 3,288

**Math/Stats**

I have like 9 more of these problems, can someone please help me out so I can get started. thanx JS In a random sample of 35 tractors, the annual cost of maintenance was $4,425 and the standard deviation was $775. Construct a 90% confidence interval for this. Assume the annual...

*May 1, 2013*

**Statistics :(**

I have like 9 more of these problems, can someone please help me out so I can get started. thanx JS In a random sample of 35 tractors, the annual cost of maintenance was $4,425 and the standard deviation was $775. Construct a 90% confidence interval for this. Assume the annual...

*May 1, 2013*

**English**

I have to write an analysis of Arthur Millers involvement in the Movie and in the Play of the Crucible. How is Millers involvement in the Movie? I can not find any examples. Thanks

*April 30, 2013*

**chemistry**

why do different compounds give different retention factors (Rf values) in thin layer chromatography (TLC)

*April 30, 2013*

**Math**

What formula to use when finding patterns of sum of unit fractions #egyptian fractions

*April 24, 2013*

**science**

When 10grams of sodium chloride, NaCL,dissolves in 100grams of water, the freezing point of the water gose down to -5.9C. when 10grams of table sugar C H O, dissolves in 100grams of water, the freezing point only goes down to - 0.56C. how do yo0u account for this difference?

*April 23, 2013*

**MATH**

Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. (Enter your answers as a comma-separated list. Enter EMPTY or Ø for the empty set.) {1, 4, 8} union {3, 7, 9}

*April 21, 2013*

**math**

x+y=3..(1) -(x-y=-1)..(2) 2y=4 y=2 substituting in (1) above x+y=3 x+2=3 x=3-2 x=1

*April 21, 2013*

**calculus**

yes...i copied it correctly..well i'll try again..thanks again

*April 18, 2013*

**calculus**

hey reiny--thats what i thought as well but the online homework says that answer is wrong

*April 18, 2013*

**calculus**

find the sum. use the summation capabilities of a graphing utility to verify your result. 5 Sigma (3a) k=2 ??

*April 18, 2013*

**phy**

How much heat is required to raise the body temperature of a 60.0-kg woman from 37.0° C to 38.2° C?

*April 17, 2013*

**Chemistry**

Tungsten trioxide (WO3) has a rich yellow color and is often used as a pigment in ceramics and paints. In order to test a ceramic vase for its WO3 content, a 10.10 g sample of the vase was ground and reduced with Pb(Hg) to convert any WO3 to W3 . The resulting W3 was ...

*April 16, 2013*

**Chemistry**

A 2.304 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.500 grams of KI and 50.00 mL of a 0.00912 M KIO3 solution. The excess I3– was titrated with 50.00...

*April 16, 2013*

**math**

$600

*April 16, 2013*

**PSY202**

This branch of psychology is primarily concerned with what can be readily seen and recorded

*April 13, 2013*

**PHYSICS! I CAN NOT GET**

I have no idea. I'm pretty sure I used 2.6 instead of 2.5 on accident! OOPS

*April 12, 2013*

**PHYSICS! I CAN NOT GET**

A group of swimmers is resting in the sun on an off-shore raft. They estimate that 2.5 m separates a trough and an adjacent crest of surface waves on the lake. They count 15 crests that pass by the raft in 15 s. How fast are the waves moving? ____m/s (I got these answers and ...

*April 12, 2013*

**Physics!! HELP**

A group of swimmers is resting in the sun on an off-shore raft. They estimate that 2.5 m separates a trough and an adjacent crest of surface waves on the lake. They count 15 crests that pass by the raft in 15 s. How fast are the waves moving? _____m/s

*April 11, 2013*

**chemistry**

a salt shaker filled with 17.0g sodium chloride contain how many moles?

*April 10, 2013*

**chemistry**

an aqueous solution solution of sodium borate is sometimes used to to fire-proof wood. a. what is the molarity of 2.50 L of solution that contains 1.85 moles of sodium borate? b. what is the molarity of 45.0 L of solution that contains 6.78 kg of sodium borate? c. how manny ...

*April 7, 2013*

**chemistry**

50 ml of a .1103M solution of formic acid is titrated with a .2511M NaOH. a) What is the pH before and NaOH is added? b) How many mL of NaOH solution must be added to reach the equivalence pt? c) what is the pH at the equivalence pt of the titration? d) If the titration is ...

*April 7, 2013*

**chemsitry**

Consider the diprotic acid H2A with K1 1*10^-3 and K2= 1*10^-9 . Find pH, [H2A], [HA], and [A2-] for a .2000M solution of H2A b)Find pH, [H2A], [HA], and [A2-] for a .200M solution of HA- c) Find pH, [H2A], [HA], and [A2-] for a .200M solution of A-

*April 7, 2013*

**maths**

4pm-12am there is an 8 hour time gap (5,6,7,8,9,10,11,12. (8 hours) 8*2=16. 14-16= (-2) so it's negative 2 degrees out.

*April 7, 2013*

**math**

5[12x+16y=1/5] 60x+80y=1--->eqn 1 4[13x+24y=1/4] 52x+96y=1 36[60x+80y=1] 30[52x+96y=1] 5[12x+16y=1/5] 60x+80y=1--->eqn 1 4[13x+24y=1/4] 52x+96y=1--->eqn 2 [60x+80y=1]36 [52x+96y=1]30 2160x+2880y=36 -1560x+2880y=30 600x=6 x=1/100 substitute the value of x in any ...

*April 7, 2013*

**math**

6 and 1 third

*April 6, 2013*

**Math**

Three

*April 5, 2013*

**math**

i am less than a hundred the sum of my digits is seventeen i am an even number

*April 5, 2013*

**Grammar**

i wouldd say were

*April 5, 2013*

**Simple Math**

Please explain to me what I need to do . A cable 35 feet long runs from the top of a utility pole to a point on the ground 30 feet from the base of the pole. How tall is the utility pole ?

*April 5, 2013*

**Math**

thank you

*April 4, 2013*

**Math**

A cafeteria manager needs to know how many apples and bananas to place in a cafeteria vending machine. He conducted a survey, and all students who respended chose either an apple or banana as their preferred fruit. The survey results show that 3/4 of the students who responded...

*April 4, 2013*

**Math**

K. I'm sorry I didn't understand what way you were saying it. Good greef.

*April 4, 2013*

**Math**

Was this a smart remark? "Next time just post another question I guess :D" If so, I'm not really in the mood.. but if you meant it I do have another question........

*April 4, 2013*

**Math**

1* out of* 20

*April 4, 2013*

**Math**

You're fine. I also need help on a couple others. A survey of 500 people found that 1 lout of 20 had at least one bird as a pet. How many people who were surveyed owned at least one bird?

*April 4, 2013*

**Math**

Thanks! But how did you get that..?

*April 4, 2013*

**Math**

A tea company is making a special blend of two teas for aa customer. The ratio of Kenyan tea to Darjeeling tea in the blend is 4 to 5. How much Darjeeling tea is in 90 ounces of the blend?

*April 4, 2013*

**Math**

Collision insurance is insurance that safeguards the owner of the vehicle from damages that occur from vandalism, weather, or theft. A. True B. False

*April 4, 2013*

**Chemistry**

2.00 L of 0.800 M NaNO3 must be prepareds from a solution which 1.50 M in concentration. How many mL of the 1.50 M are required ? I am not sure weather " 2.00 L " is my V1 or V2 .

*April 3, 2013*

**Physics**

The earth's Field is Roughly equivalent to an axial centered dipole. Find the vertical rate of change of the vertical component of the earth's field in gammas/foot here at flagstaff. Given" vertical component of earth's magnetic field at flagstaff is equal to ...

*April 2, 2013*

**Math**

These are my choices ... A . 203 B. 784 C. 105 D. 392

*March 31, 2013*

**Math**

Evaluate 2y^2(x+y) when x=1 and y=7

*March 31, 2013*

**Simple Math**

Please help me with this problem . It is not hard but I need some help . In a clinical trial, a drug used to relieve pain caused side effects in 9% of the patients who took it. For a new trial, two patients were selected at random. Find the probability that neither of the ...

*March 31, 2013*

**life orientation**

What are the two orgainizatoins that are involved in supporting noise pollution

*March 30, 2013*

**math**

A cleaner charges $0.50 per square foot to polish wood floors. A school hall has a floor area of 30 feet by 50 feet. What would be the total cost to polish the floor of the school hall? A.$80 B.$375 C.$750 D.$1,500

*March 29, 2013*

**Chemistry**

You prepare a solution from 10.0 mL of 0.100 M MOPS buffer (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.071 M NaOH. Next, you add 1.00 mL of 1.89 × 10-5 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine present in the form...

*March 27, 2013*

**Social Studies**

PLEASE ANSWER! PLEASE ANSWER! PLEASE ANSWER! 1) Identify two problems resulting from urban sprawl in the western region of the United States. If these problems are not solved, what will the outcome likely be? 2) Why do you think the Canadian government is opposed to Quebec'...

*March 27, 2013*

**Social Studies**

PLEASE ANSWER! PLEASE ANSWER! PLEASE ANSWER! Identify two problems resulting from urban sprawl in the western region of the United States. If these problems are not solved, what will the outcome likely be?

*March 27, 2013*

**math**

Thanks John I got 6/6 100%

*March 27, 2013*

**algebra**

The number of red beads sheila has is four times as many as the number of green beads she has .There are 75 red and green beads.How many red beads does sheila have?

*March 27, 2013*

**Physics**

A 1.6-mole sample of an ideal gas is gently cooled at constant temperature 280 K. It contracts from initial volume 37 L to final volume V2. A total of 1.9 kJ of heat is removed from the gas during the contraction process. What is V2? Let the ideal-gas constant R = 8.314 J/(mol...

*March 27, 2013*

**writing**

Sentence 1: I am writing in reply to your advertisement in the Elkhart Sun for a sails representative. Which correction should be made to sentence 1? 1. Replace to with too 2. Replace sails with sales 3. Insert a comma after advertisement 4. Insert a comma after for 5. No ...

*March 25, 2013*

**algebra**

the larger leg of a right triangle is 7ft longer than its samller leg. the hypotenuse is 1ft longer than the larger leg. how many feet long is the samller leg?

*March 24, 2013*

**Prenatal Development**

I'm having a hard time choosing a teratogen (anything that causes harm to a fetus), especially since all the easy ones to find ones are all taken--Radiation, Rubella, Syphilis, Hydrocodone, Heroine, Methamphetamine, Methadone, Caffeine, Nicotine, Mercury/Methylmercury, ...

*March 23, 2013*

**Math--Algebra**

Please help! I need this for extra credit!

*March 21, 2013*

**Math--Algebra**

What are the math problems?

*March 21, 2013*

**physics**

Susie and Sally are seated on opposing sides of a seesaw. Sally weighs 500 N and is seated a distance of 2 m from the fulcrum (point of rotation). Susie weighs 450 N and is seated a distance of 2.5 m from the fulcrum. Who is being lifted upward?

*March 20, 2013*

**math**

what is 14.876 rounded to the nearest hundredths?

*March 20, 2013*

**Spanish 2**

Thanks a lot!! :)

*March 17, 2013*

**Spanish 2**

Double Object Pronouns. Sustituya (Substitute) los complementos directos e (and) indirectos por sus respectivos pronombres. Modelo: Alberto le sirvió café a Jimena. Alberto se lo sirvió. Can you please check my anwsers for these sentences? Gracias! 1....

*March 17, 2013*

**SPANISH 2 HELP**

Thanks

*March 17, 2013*

**SPANISH 2 HELP**

Will someone check my anwsers? Thanks ¿Quién te sacó estas fotos? A. Julio me los sacó. B.Julio te las sacó. C.Julio me las sacó. ¿Quién les mandó estas flores a Uds.? A.Ceci nos los mandó. B.Ceci nos las ...

*March 17, 2013*

**Spanish 2**

I need help picking the rightsentence form? Thanks ¿Quién te sacó estas fotos? A. Julio me los sacó. B.Julio te las sacó. C.Julio me las sacó. ¿Quién les mandó estas flores a Uds.? A.Ceci nos los mandó. B....

*March 16, 2013*

**Math**

Find the solution and round to the hundredths. 24 divided by 0.865. I got two answers I'm confused.

*March 16, 2013*

**Chemistry**

Use activity coefficients to find the concentration of hydrogen ions in a solution of 65.0 mM butanoic acid and 0.01 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO– to be 500 pm. Find [H+], pH, and alpha.

*March 12, 2013*

**QSO 510**

221667

*March 12, 2013*

**HIstory HELp!!**

Please help with history? I have a project where I have to find the primary and or secondary source of today's time. The questions are 1.what is the context of the primary/secondary source that you have discovered? 2.what do you believe this reveals about society today? 3...

*March 12, 2013*

**HISTORY**

Please help with history? I have a project where I have to find the primary and or secondary source of today's time. The questions are 1.what is the context of the primary/secondary source that you have discovered? 2.what do you believe this reveals about society today? 3...

*March 12, 2013*

**precalc**

The front sprocket off a bicycle is 12 centimeters and the rear one is 5 centimeters. If the front sprocket is rotating at 40 revolutions per minute, what is the angular velocity of the little sprocket?

*March 12, 2013*

**English**

And I forgot to add, out of the 6 quizzes I only took 2. 4/5. I know I'll do good on the labs & exams but the quizzes are kinda hard. Do you think the quizzes will hurt my grade in the end? thank you!

*March 11, 2013*

**English**

Yes, I have to have c+ to pass this class.so far I have 65.6% & need 76% to pass? If I take the other 8 labs, 3 quizzes, 2 exams that are left & get C's on exam or Ds;do you think I'll get B? Thank you so much!

*March 11, 2013*

**English**

i have a hard time calculating my grade & am in college. Please tell me the grade I have so far & will have, thank you!365 points in the course is needed. Lecture exams and quizzes are worth about 60% of the total grade &90 ≤ A 80 ≤ B < 90 70 ≤ C < 80 ...

*March 11, 2013*

**Science**

What property of water causes a water droplet to be shaped like a dome? Also can you please explain these words? Surface temperature, surface area and surface tension.

*March 10, 2013*

**Chem**

how many grams of KMnO4 should be weighed out to give 0.100 mole?

*March 9, 2013*

**math**

Nina walked 15 yards to pauls house which rule shows how many yards nina walks for every yard pauls walks

*March 7, 2013*

**math**

If the radius of a circular wave is increasing at 2 meters/sec, how fast is the area changing when the radius is 5 meters? A)62.8 square meters per second B)25.0 square meters per second C)31.4 square meters per second D)6.3 square meters per second E) None of the above

*March 7, 2013*

**math**

If the radius of a circular wave is increasing at 2 meters/sec, how fast is the area changing when the radius is 5 meters?

*March 7, 2013*

**science**

what are three states of matter

*March 6, 2013*

**Physical Science**

A sedan weighing 4000 pounds travelling at 30mph collides head on with a compact car weighing 2000 pounds and travelling in the opposite direction at 45 mph. What is the resultant velocity of the combined vehicles?

*March 6, 2013*

**Math**

Thank you so much Ms.sue your a life saver!!!

*March 5, 2013*

**Math**

I'm trying to find the height of the rectangular pyramid

*March 5, 2013*

**Math**

The volume of it is 1125 cubic inches, the length is 18 inches, and the width is 15 inches. Can you also show me how to do because I have a test on it Monday. Thanks!

*March 5, 2013*

**math**

the pet shop owner told Jean to fill her new fish tank 3/4 full with water. Jean filled it 9/12 full . what fraction of the tank does Jean still need to fill?

*March 4, 2013*

**math**

Hello if you need homework help call this number (5084843860)

*March 1, 2013*

**math**

I have no idea

*March 1, 2013*

**history**

When the First World War ended, Americans welcomed what they hoped would be a “return to normalcy.” The decades that followed, however, are ones which would rarely be described as normal, in comparison to what came before or after. During these decades, a struggle ...

*February 28, 2013*

**Science**

Solution preparation: 500ml's of .2M Sodium Cacodylate Buffer with a pH of 7.4 I don't even know where to start, could someone please tell me how to do this problem.

*February 24, 2013*

**life orientation**

Air pollution is one such environmental problem that causes ill health,accidents,crises(and disaster within any community within South Africa or globally)

*February 24, 2013*

**math**

You add 3/4+3/4+2 to get your answer

*February 21, 2013*

**math**

Paid $750 if u multiply 2.50 and 300. Then I multiply 750 and get 225. Fo I subtract that from 750 and get 525 or is it the snswer $225?

*February 21, 2013*

**math**

Ok but I don't knoe how to do it

*February 21, 2013*

**math**

I'm so confused on how to do it

*February 21, 2013*

**math**

I need help!!! Whats the name of the other person you did it to?

*February 21, 2013*

**math**

Miriam orders a shipment of 1500 pounds of ice for her supermarket. The ice comes in individual 5 pound bags that cost Miriam orders$2.50 each. Miriam sells the bags for 30% more than her cost. How much profit, in dollars, will Miriam's supermarket earn from the sale of 1 ...

*February 21, 2013*

**math**

Ok this is what I did. 5÷1500 got 300. Took 300×2.50 got 750. Subtracted 120-36 got 84. Then, I took 750×.3 and got $225. Ibdon't know if that's the answer or what. This is just confusing.

*February 21, 2013*

**trigonometry**

what are the solution sets to x^5-2x^3+x=0 and how do you get them?

*February 18, 2013*

**math Statistics**

Suppose that 33 out of 300 selected american drivers read the newspaper while driving. what percent of sample proportions are greater than this?

*February 18, 2013*

**Basketball Current Event**

Do you go to Helen Bernstein? Apex? I think I know you

*February 18, 2013*

**Math**

IDK but I'm not in eight grade, YET!! Comment, share, and love My pro in Facebook. Find me as Jessi Vertiz

*February 18, 2013*