Helen

This page lists questions and answers that were posted by visitors named Helen.

Questions

The following questions were asked by visitors named Helen.

How do you know whether a system of equations has no solution, one solution, ormany solutions? How can you identify whether a system is consistent or inconsistent???? Please Help me!!!! Thanks so much! I believe it is consistant if there is onlii one vari...

x^2+x=12 Since you do not ask a specific question, I assume that you want to find the factors. x^2 + x - 12 = 0 From the above, for the center term, you are looking for two values whose product is -12 and whose sum is +1. (x + 4)(x - 3) = 0 I hope this he...

What are the Lewis structures for hydrogen cyanide and cyanogen?? I think it's H:C:::N :N:::C:C:::N: with the inner upper electrons being shared. For the elements in these compounds, which is the noble gas whose electron configuration is attained in the L...

Rank these in order of increasing freezing points: C2H6O, NaCl, NaSO4, C12H22O11 I suggest that you look them up. You will have to make an assumption at the isomer of the organic compounds that is intended, but it will not make a difference to the ranking...

predication 1. The reason for the cat's illness is because she was allergic to the dog. 2. The driving exam is when one is tested on he rules of the road. The cat's allegy to the dog caused her illness. Using "is because" and "is when" makes very awkward,...

Suppose the amount of heat removed when 3.0kg of water freezes at 0 degree C were removed from ethyl alcohol and its freezing/melting point of -114 degree C. How many kilograms of ethyl alcohol would freeze? PLEASE GIVE ME SOME HINTS!!!THANKS A LOT!!!!

Suppose the amplitude and frequency of a transverse wave are, respectively, 1.3cm and 5.0Hz. Find the total vertical distance (in cm) through a fixed point in 3.0s. PLEASE GIVE ME SOME IDEAS TO DO IT!!!THANKS A LOT!!!!!!!

How would I calculate exponential regression?

n=15 and there are 3 groups These data are analyzed by an ANOVA, and the resutls are reported in the following summary table. fill in all missing values in the table. * All that is given in the table is the MS(mean square) within treatments=20 and F=4 (f-...

similarities between and oxidative phosphorylation and photophosphorylation

Can someone provide me the help to explain this statement: "An important step in the history of life on Earth was the evolution of eukaryotic cells from prokaryotes"

last question about bio Explain the statement below: “ Biological evolution began when cells formed”

How to build tetrachords for the following staffs: G, F, A, E, C#,

At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction <- 2CO2(g) -> 2CO(g) + O2(g) is about 1*10E-13. Assuming that the exhaust gas (total pressure 1 bar) contains 0.2% CO, 12% CO2 and 3% O2 by volume, is the system at equil...

At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction 2CO2(g)⇄2CO(g) + O2(g) is about 1*E-13. Assuming that the exhaust gas (total pressure 1 bar) contains 0.2% CO, 12% CO2 and 3% O2 by volume, is the system at equilibrium w...

Under what circumstances do you need to perform dilution(s)?

I Need help with the following question: If moe has 3x as many singles as larry, and Larry has 4X as many doubles as curly. How many singles and doubles did they each have. They only got singles and doubles. They all had the same number of singles and dou...

A vehicle starts w/ a full tank of gasoline and travels 150 miles. While refilling the tank, the driver notes that the vehicle used (1/4) tank of gasoline in traveling the 150 miles. Assuming the vehicle averages 25 miles per gallon, approximately how man...

A pine tree casts a 12-meter shadow on level ground. The angle of elevation from the tip of the shadow to the top of the tree is 50 degrees. To the nearest tenth of a meter, what is the height of the pine tree? Explain

A diameter of circle that has endpoints (-4,12) and (8,-2), as shown below, is in the standard (x,y) coordinate plane. What point is the center of the circle? Explain

Each element in a data set is multiplied by 2, and each resulting product is then increased by 5. If 'm' is the mean of the final data set, which of the following expressions gives the mean of the original set in terms of 'm'? ~why is the answer (1/2)(m-5...

If a,b,c,d, and x represent positive real numbers, what is the maximum value of the function f(x)= a[cosb(x+c)]-d?

Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value of y-2x?

Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value of y-2x?

Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value of y-2x?

a 4.8 force acts on a 4.4 kg mass that sits on a frictionless table for 6.4 meters. What is the Kinectic Energy that the object has?

who was president during Muller vs. Oregon? Roosevelt or Taft?

Why is it important to use caution before putting any personal information on a computer? (example(s) required) I think everyone knows the general idea to the answer to this question but this is my final exam question...so it has to be thorough. Any speci...

i need help with answering homework questions

If the median is greater than the mean on a set of test scores, describe the situation.

How are the family

Sometimes it took days until I could pull out the artifact that had staring me in the face, and not doing so beforehand had taken much patience and self control. Is the grammar correct?

The field school was an amazing and eye-opening experience in which I was able to travel to an area I had never visited before and learned about a culture I hadn’t known about.

1) "I would like to learn as much as possible as soon as possible" Should there be a comma after the first "possible?" 2)"The liberties that the university provides to its students..." Should I take out the "to"?

1) Their kindness will give me the gift of patience... does this sound okay? 2)In this method, I could learn from different areas of study and eventually narrow my path and focus on a certain aspect of the field with pure confidence. Too many ands?

Is the grammar in the following sentence ok? For, surely, the paintings were created by people who were not so different than myself.

I remember instances where I fell. when or where ?

We all Crave Horror Movies essay by Stephen King What does King mean in paragraph 4 when he says that horror movies are “innately conservative, even reactionary”? What does he mean in paragraph 11 when he calls them “anarchistic, and revolutionary”?

translate to an algebraic expression. 13 less than b

The four tires of an automobile are inflated to an absolute pressure of 200000 Pascals. Each tire has an area of 0.024 m^2 in contact with the ground. Determine the weight of the automobile.

An airplane is pressurized to 650mm Hg, which is the atmospheric pressure at a ski resort at 13,000ft altitude. a. if air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100mm Hg, passen...

name 2 homes where some of the most famous authors of Florida have lived and visit at least 2 places they have described in their books.

I need help with these problem please. X^2+6=15 (x+4)^2=6 can some one help me please.

-9(x-3)^2=-7 ^3square root 4/3

How does division work? Can you describe a picture of what happens during division?

Can i combine the following? Explain why or why not. 5x+4x(squared) 7x(cubic)-2x+x(cubic)-5x 3xy+2y

Simplify the following (6b-2)(6b+2)+4(b^2-3b) Find the factors of the following e^2+8e+15 5f^2-15f+10 Does g^2-9 have factors? If so, how there is no "middle" term?

We're reviewing and I forgot how to do this. Given y=x2-4+3 (x2 is x squared) a)write in standard from b)find vertex c)find equation of the axis of symmetry d)find the x-intercepts e)find the y-intercept

calculate cell potential at 25C for: 3Fe3+(aq) + AL(s)= 3Fe2+(aq)+ Al3+ (aq) if Fe3+ = 0.300 M, Fe2+ = 0.150M Al3+ = 0.300M. The standard reduction potentials are as follows: Fe3+ (aq) + e- = Fe2+ (aq) Al3+ (aq) + 3e-=Al (s) Eo = +0.771 V Eo = -1.66 V

A volume of 25.0 ml of 0.100 M CH3C02H is titrated with 0.100 M NaOH. What is pH after the addition of 12.5 ml of NaOH? (Ka for CH3CO2H = 1.8x10-5)

A volume of 25.0 ml of 0.100 M CH3CO2H is tiltrated with 0.100 M NaOH. What is pH after the addition of 12.5 mL of NaOH? (Ka for CH3CO2H = (1.8 x 10-5)

Calculate pH of 0.02 mol/L Ba(OH)2 solution. (Assume 100% dissociation).

What is pH buffer of 0.1 mol L-1 Na2HPO4/O.15 mol L-1 KH2PO4? KH2PO4? Given Ka(H2PO4-) = 6.2 x 10-8). I would like to know the correct formula, steps for the answer Thank you

Given following reduction potentials in solution. Which is weakest oxidising agent in the list. List of numbers on right is for Eo/V. Al3+(aq)+3e- = Al(s) -1.66 Sn4+(aq)+2e- = Sn2+(aq) +0.14 Is(s)+2e-=21-(aq) +0.53 Why is a certain substance weakest? Is i...

If 10.6 mol of carbon monoxide is produced how many grams of carbon were used? How do you convert moles to grams? And what are the steps please for the answer.

Which is the correct form of equilibrium expression of the following reaction. 2PbS(s)+3O2(g)reverse arrow 2PbOs + 2SO2g Why is the answer Kc= SO2 power 2/O2 power 3 Why in particular is this the arrangement for equilibrium expression? Thank you

Police records in the town of Saratoga show that 18 percent of the drivers stopped for speeding have invalid licenses. If 16 drivers are stopped for speeding (a) Find the probability that none will have an invalid license. (Round your answer to 4 decimal...

The probability of a manufacturing defect in an aluminum beverage can is .00003. If 100,100 cans are produced, (a) Find the approximate probability of at least two defective cans. (Round your answer to 4 decimal places.) (b) Find the approximate probabili...

At an outpatient mental health clinic, appointment cancellations occur at a mean rate of 1.60 per day on a typical Wednesday. Let X be the number of cancellations on a particular Wednesday. a) What is the probability that no cancellations will occur on a...

In a certain store, there is a .05 probability that the scanned price in the bar code scanner will not match the advertised price. The cashier scans 820 items. a) What is the expected number of mismatches and standard deviation? (Round your expected numbe...

I'm having a hard time understanding how to fine the Total Area(T.A) for a regular pyramid.

1. Nitrogen gas and sodium liquid are produced by the decomposition of sodium azide NaN3 (s). what volume of nitrogen gas, measured at 25 C and 0.980 atm, is produced by the decomposition of 62.5 g of sodium azide? 2. A gas sample in a container with a vo...

The approximate vapor pressure of CS2 at 30 degrees Celsius?

Complete the table below: For each of the following sets pick the compound with the highest conductivity in a 1 M aqueous solution. (Enter the number at the top of the column containing the correct answer.) 1 2 3 Answers a HCl HC2H3O2 H2PO4– b KNO3 Ca(NO3...

Two 125 kg bumper cars are moving toward each other in opposite directions. Car X is moving at 10 m/s and Car Z at –12 m/s when they collide head–on. If the resulting velocity of Car Z after the collision is 10 m/s, what is the velocity of Car X after the...

what is 4a-7=4(a-2)+1?

How do I solve for: 5000 = 45t^2 + 240t + 450

Could someone please help me with this question? What is the relationship to the law and the government structure as it applies to the criminal justice system? Here is what I have so far: The relationship to the law and the government development as it re...

Could someone please help me with this question? What are crime rates? This is what I have so far: Crime rates are the number of offenses reported for each unit of population. How could I expand on this? Thanks for your help!

Could some please help me with this? I am not sure what to really say. Thanks! Describe the historical development of police agencies and their jurisdiction. Thanks so much for the help!

What influence does culture have on personality? Do you see a persons reaction to something as separate from social experience or as a result of social experience? Which one of the four positions of the nature of traits do you agree with most and why? Com...

Why is oxygen less soluble in water as temperature of the water increases ? Are there any elements that are like this too?

Assume that there is a perfect competition market for a good X. If one supplier all of a sudden wins the lottery and buys all the other firms that make good X and turns this market into a monopoly. Describe to me the difference in price and total output f...

For any distribution (normal or not normal), the probability of selecting a score greater than the median is

farmer has 10 trees see if you can plant them so there are 5 rows of trees with 4 trees in each row

A car traveling at 120 strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.90 . What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "'s," wher...

a saturated solution of barium chloride at 30c contains 150g water. how much aditional barium chloride can be dissloved by heating this solution to 50c?

A bowling ball of mass M and radius R is thrown along a level surface so that initially ( t= 0) it slides with a linear speed but does not rotate, see the figure. As it slides, it begins to spin, and eventually rolls without slipping. How far has the ball...

Simon issues four-year bonds with a $50,000 par value on June 1, 2011, at a price of $47,974. The annual contract rate is 7%, and interest is paid semiannually on November 30 and May 31.

How many gallons of 15% iodine solution should be mixed with 40% iodine solution to make 100 gallons of a 20% solution?

I am trying to double check my answer, I completed a spatter blot of an assignment, 20 student, variables study hours and final exam scores, the two I am suppose to predict would be study hours of 5 and study hours of 11. How would I put that in an equati...

A bucket contains blue balls and yellow balls. the probability of removing two blue balls without replacement is 2/5 and he probability of removing three blue balls without replacement is 1/5. Why must there be two more blue balls then yellow balls? How m...

A rocket with initial mass of 7.50×103 kg is fired in the vertical direction. Its exhaust gases are ejected at the rate of 4.50×101 kg/s with a relative velocity of 2.200×103 m/s. What is the initial acceleration of the rocket? What is the acceleration af...

Two pellets, each with a charge of 0.80 microcoulomb (8.0×10−7 C), are located 4.0 cm (4.0×10−2 m) apart. Find the electric force between them.

Electronic types neglect the force of gravity on electrons.To see why, compute the force of Earth's gravity on an electron and compare it with the force exerted on the electron by an electric field of magnitude 6000 V/m (a relatively small field). The mas...

A droplet of ink in an industrial ink-jet printer carries a charge of 1.1×10−10 C and is deflected onto paper by a force of 3.7×10−4 N.Find the strength of the electric field to produce this force.

An energy of 6.0×10−2 J is stored in the metal sphere on top of a Van de Graaff generator. A spark carrying 1.0 micro-coulomb (1.0×10−6 C) discharges the sphere.Find the sphere's potential relative to ground. last one for the night

A tuning fork has been damaged and its frequency slightly changed. What could its altered frequency be if it produces two beats per second with a tuning fork that is known to vibrate at 422 Hz? Lowest frequency? Highest frequency?

You have a tuning fork of unknown frequency. When you ring it alongside a tuning fork with known frequency of 360 Hz, you hear beats at a frequency of 10 Hz. When you ring it alongside a tuning fork with known frequency of 347 Hz, you hear beats at a freq...

Answers

The following answers were posted by visitors named Helen.

NO ONE ANSWER THIS QUESITON!!! I can't believe you are trying to get someone to do your AIU homework for you!!!!

For the vertical change, why is it 5.2cm per period?Shouldn't it be 2.6cm?

thank you! i understand now

thank you! that really helped

the answer is -17 but i don't understand how you get it

ok i think i see now thank you!

For the sentence that starts with, "Luego" I think it could be Luego yo trato de estudiar y hacer mi tarea... i'm not positive about the trato

yes i looked on those websites and unless i missed something I couldn't find anything about it.

is the grammar correct?

how about this? I dream of discovering societies and understanding them through the remnants that people not so different than myself left behind.

Sorry, I meant meant to say that I didn't know whether to use the word "when" or "where".

a driver who drives at a speed of r mph for t hr will travel a distance d mi given by d = rt miles. How far will a driver travel at a speed of 58 mph for 5 hr?

Opportunities: 1) Acquisitions in key operating areas and/or related companies 2) Continued global expansion into Europe and emerging markets 3) Leverage the 3M brand name and image Threats: 1) Expensive product that might make it difficult to displace a...

okay. in florida, right i need to find 2 authors and where they live. then i have to find a place in their books (one place for each book)and write it down.

Why have noone answer these problem I need some help

Thaank youuu :)

I got # 1 Pleas help with the 2nd A gas sample in a container with a volume “V” at a temperature “T” with a total number of moles “n”, has 76.8 mole percent N2 (g), 20.1 mole percent O2 (g), and 3.1 mole percent CO2 (g). if the ratio nRT/V is equal to 1.0...

thank u so it is n2 ---> (76.8/100)x (1.002)!!! ok...great can u help me with 3, 4, and 5 please if u be so generous

Southeast Academy Switched-on online?

math the expression 4(3)+4(3)

My question should have read this: What is the government structure as it applies to the criminal justice system? Thanks for your help.

that's correct.

What type of solution is formed when steam from boiling water evaporates into the air?Explain

Can ayou nswer this? Good luck!!!!!!!!!. Horses are $10, pigs are $3 and rabbits are $0.50. A farmer buys 100 animals for $100, How many of (each ) animal did he buy? Hint: there are 2 answers

a saturated solution of barium chloride at 30 c contains 150g water. How much additional barium chloride can be dissolved by heating this solution to 50c?

it says to answer it in terms of those coefficients

like, it's asking for formulas...

S1: caller, collar S4: tease, teas

Hey, I just wanted to help and point out that delta n = moles of gaseous products - moles of gaseous reactants according to my chem lecture.

So for the first one would I divide 2.6 and the molar mass of Manganese which is 24.3 to get the answer?

What about part B please?

No, I don't understand the concept.

I think it's increase, remain the same and decrease but Im not sure...

I have some ideas: First, you should find books that she enjoys to read, so ask her what she likes. Then, go to the library or somewhere to find a book for her. Now you should encourage her to set a daily reading schedule, so her reading gets fixed too! B...

Thanks for all that! I'm a visual learner, and in class right now we are not using our textbook because we are working on a Spanish country project, but we have to memorize some lines in Spanish for our presentation. So far this has really helped, thanks...

2. When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46°C. (a) Calculate the molar mass of the unknown compound. The freezing point of benzene is 5.48°C, and the Kf of benzene is 5....

I just wanted to mention politely that I am a girl.

Write your answer in standard form with integer coefficients. 2x+3y=30; (2,-5) That is a parallel line to the given line and contains the given point.

Thank you PsyDag. 5% cutoff

the correct is 3. In P10 the 1st one is wrong. P2: 1 wrong P4: -2,1 and -2,3 wrong P5: 1 and 2,5 % wrong P9: 1 and 1,2 wrong

I don't understand too. Do you know any answers? except P9

Oh i found them thank you.. I am truing P5 and P4. I really want to learn what is the answer of P4. Basically I tried 2 times I have no more submissions. I was doing a typo. Later i concluded in -2.6 but I cant learn if is correct!

Thank you stat001 The link you gave us is not directing on a specific question.

Thank you PsyDAG. I hope you had answer before.. I answered the B!

Oh now. I was right. You are wrong!

Thank you Lee!!

sorry thanks Which line best states the theme of John Donne's holy sonnet 10? 1. "Ann soonest our best men with thee do go" 2."Death be not proud, though some have call thee" 3. And Death shall be no more; Death, thou shalt die." 4. And doest with poison,...

for the first answer I am going with #2 I am think #1

If this be error and upon me proved/ I nevered writ, nor no man ever loved." What is the impact of these concluding lines from shakespeare's sonnet 116? 1. They underscore the fact that everyone makes mistakes 2. They underscore the fat that shakespeare i...

eleven is number #1 because the word error and impediments means obstacles and it also stated mistake in the poem 14. is number 3 because what was stated in I cor.

I just wanted to compare my answer with the answer that i will be getting.. This is what I have: Exothermic reaction starts at a higher energy value and ends at a lower energy value. In an exothermic reaction, we know that energy is given off in the form...

Can you answer it please? I just want to compare my answer..

Freezing and melting are two different physical changes that involve the same amount of energy. In an exothermic reaction, the amount of energy in the reactants is higher than the resulting amount of energy in the products. This means that the line graph...

In freezing, the stronger attraction that results in closer/shorter bonds (though the overall density increase due to the highly ordered structure) than in melting water so the potential energy is lower.

please check my answer

Wait wait, nevermind, check this one: In freezing, the amount of energy in the reactants is lower than the resulting amount of energy in the products. This means that the line graph starts at a lower energy value (representing the potential energy of the...

im so sorry this is Helen Gonzalez please forgive me im so sorry don't tell my teachers cause if you do you will get hurt bad

Ahh, for the first problem, I wasn't sure if I was supposed to plug in numbers (1-5) or if there was a particular number I was to plug in rather than randomly, but now realizing that it's between a1-a5 with the numbers accordingly. And for the second prob...

Don't no the right answer but it's not A

Can someone answer this

Assignment 1: LASA 2: The Apportionment Problem You are a census officer in a newly democratic nation and you have been charged with using the census data from the table below to determine how 100 congressional seats should be divided among the 10 states...

A) 1.1x 10^5 J B)195m

breaks diwn immune system noo

are all of them a preposition

No, I was asking if all the "to" were preposition in the sentence

For #12, I meant to put simple

oh Latonia has the greater percent

so is it 1/6*1038?

The statement is "An obtuse angle and an acute angle are always supplementary."

Is the answer to #1 A?

Please help and check my work! By the way, #1 is actually D.

Please help me. This is the second time posting it after waiting for several hours.

So are there infinite solutions?

But shouldn't ordinary interest be x days out of 360 and exact interest be x days out of 365? My calculations led me to $4,850.10 as the remaining balance after the payment of $4,000. MV (120 days) = $8,500(1+ 9% x 120/360) = $8,755 = $8,755 - $4,000 = $4...

Entry for equipment purchase: ____________________________ DR EQUIPMENT with the total of price + tax + freight + installation. CR ACCOUNTS PAYABLE with the total of price + tax [because they were paid on account). CR CASH with total of freight + installa...