Tuesday
July 28, 2015

Posts by anna


Total # Posts: 2,187

Finite Math
The quantity demanded x of a certain brand of DVD player is 3000/week when the unit price p is $485. For each decrease in unit price of $20 below $485, the quantity demanded increases by 250 units. The suppliers will not market any DVD players if the unit price is $350 or ...
January 13, 2015

physics
A racing car has a mass of 1970 kg. The acceleration of gravity is 9.8 m/s^2. What is its kinetic energy if it has a speed of 102 km/h? Answer in units of J.
January 11, 2015

Chemistry
If 0.45 M of ammonia solution has a pH of 9.20, what is the H+ concentration of the solution?
January 10, 2015

Physics and Math
The given answer is root over 2000
January 8, 2015

Physics and Math
[a bullet weighing 50gm hits a 10cm wall with velocity 100ms-1 and comes out of the wall. If the frictional force on the bullet while in the wall is assumed to be a constant 2000N then with what velocity does the bullet come out of the wall?
January 8, 2015

Last 3 QUESTIONS !!:( please
Thank you so much!
December 23, 2014

Last 3 QUESTIONS !!:( please
I meant 4 and my answers are 1) by approving both through the Compromise of 1877 2) The southern economy was quickly restored to pre-Civil War levels ?? 3) Lincoln read and established the Emancipation Proclamation 4)These amendments were stepping stones to economic equality ...
December 23, 2014

Last 3 QUESTIONS !!:( please
How did party leaders resolve the disputed election of Rutherford B. Hayes and southern demands for removal of troops in the South? by agreeing to home rule for the South and an investigation into the election practices in several states by disapproving both through the ...
December 23, 2014

Big History Test (Check) Part1.
Thank you(:
December 23, 2014

Big History Test (Check) Part1.
Please help me, I tried answering them my best. This isn't all the questions but I wanted to do --> check -- do --> check... then done. PLEASE
December 23, 2014

Big History Test (Check) Part1.
What was the chief goal of the Compromise of 1850? to resolve Texas's statehood issues to preserve the Union <-- to improve the economy in both the North and the South to preserve the balance between slave states and free states What theory promoted by Congressman ...
December 23, 2014

creative writing
Your welcome :D
December 23, 2014

creative writing
What is a Volta? Volta, can be used in reference to any type of literature, but is most frequently used in regard to poems, particularly sonnets. It comes from Italian and quite literally means ‘turn’, which is why you might hear it referred to as ‘the turn’...
December 23, 2014

creative writing
I think its C) a change or turn in the poem A turn in a sonnet is called a volta. A vital part of virtually all sonnets, the volta is most frequently encountered at the end of the octave (first eight lines in Petrarchan or Spenserian sonnets), or the end of the twelfth line in...
December 23, 2014

Math help...
I got it its 7/40.
December 23, 2014

Math help...
The length of a rectangle is 4/5 feet. The width is 5/8 feet. How much greater is the length of the rectangle than the width?
December 23, 2014

Math
6 9/8 - 25/6 = = 57/8 − 25/6 = ((57 × 6) − (25 × 8)) / (8 × 6) = (342 - 200) / 48 = 142/48 = 71/24 = 2 23/24
December 23, 2014

Math
13pi/12=________ degrees: Round to the nearest hundredth.
December 15, 2014

Math
Convert 35 degress to radian measure. Convert 250 degress to radian measure.
December 14, 2014

Spanish
Sra. are these better? La moraleja de la historia es no tratar de ser Dios. El primer rey trató de engañarle al otro rey en su laberinto. El rey estaba perdido y casi se murió. Se comprometió a castigar al primer rey en su propio laberinto. En su ...
December 11, 2014

Spanish
Sra. are these correct? Part I ¿Qué harías? Completa las oraciones siguientes en una manera lógica utilizando la forma CONDICIONAL. 1. Si fuera presidente… Si fuera preseident lo haría la gente sea agradable. 2. Si ganara la loterí...
December 11, 2014

Spanish
Sra. Are these correct? Part I ¿Pretérito o imperfecto del subjuntivo? Llene los espacios en blanco con la forma del PRETÉRITO o el IMPERFECTO DEL SUBJUNTIVO como apropiado. 1. Les pedí a ellos que __________ la factura inmediatamente. pagaran 2. ...
December 10, 2014

Chemistry
How much heat energy, in kilojoules, is required to convert 48.0g of ice at −18.0 ∘C to water at 25.0 ∘C ? Please show all steps. i don't know where to start
December 9, 2014

math
nvm
December 6, 2014

math
so wait what grade are you in because you could help me with something
December 6, 2014

math
okey you did that right because you already did rounded
December 6, 2014

math
wait
December 6, 2014

math
(2.00) (10.00)(2.00)
December 6, 2014

Chemistry
For which of these elements would the first ionization energy of the atom be higher than that of the diatomic molecule? helium oxygen carbon lithium Please explain why and thanks
December 2, 2014

Physics
Thank you
December 1, 2014

Physics
A rectangular trough, 2.0 m long, 0.50 m wide, and 0.50 m deep, is completely full of water. One end of the trough has a small drain plug right at the bottom edge. When you pull the plug, at what speed does water emerge from the hole? (in m/s) Hint: V = sqrt (2 g H I just don...
December 1, 2014

language Arts
B?
December 1, 2014

Chemistry
@DrBob222 Thanks! It really did help me understand it better
December 1, 2014

Chemistry
HW Help!!!! An object at 4500 K emits the blackbody spectrum shown here. This object emits the most light in the __?__ part of the visible spectrum.
December 1, 2014

Chemistry
The color of light emitted by a hot solid object depends on?
December 1, 2014

Chemistry
Given that many laboratory gases are sold in steel cylinders with a volume of 43.8 L, What mass (in grams) of argon is inside a cylinder whose pressure is 17810kPa at 24∘C? I've attempted this problem but I'm not getting the correct answer. Please explain if you ...
November 28, 2014

Chemistry
P= [14.5g*(0.0821L*atm/mol*K)*305K]/0.13L P=2792.98 P=2792.98*760mmHg = 2122664.8 g/mol*mmHg
November 28, 2014

Chemistry
If 14.5g of CO2 gas has a volume of 0.13L at 305K , what is its pressure in millimeters of mercury? I've plugged these values into the equation P=nRT/V but I am having troubles with canceling labels and getting the correct answer. Please explain as much as possible to me!
November 28, 2014

Spanish
Thank you so much! I hope you have a wonderful holiday.
November 26, 2014

Spanish
Thank you Sra. I tried these three again. You were correct they are too complicated. I sometimes feel I need to add more information than necessary. 14. ¿Qué Hizo el jefe de correos al leer la carta? Al leer la carta el jefe de correos recogido dinero para Lecho...
November 26, 2014

Spanish
Hola Sra. This one is a bit long. I hope they are correct. Part I Los pronombres relativos. Complete las oraciones siguientes en una manera lógica. Juan es el hombre a quien… Juan es el hombre a quien necesito dar el dinero. 1. Es un problema que… Es un ...
November 26, 2014

MATH!!
Joe and Susan invested $1500 at Bank of America in 2000, at 4% compounded quarterly. In the year 2005 they moved to another city and took the total money from their investment added $500 and invested in at Bank Bravo, at 5% compounded quarterly. a) What is the value of this ...
November 24, 2014

MATH!
Thank you very much!
November 24, 2014

MATH!
Barbara invested $12,300 at the Midtown Credit Union at 6% compounded monthly for 7 years. What is the effective rate of this investment?
November 24, 2014

Social Studies
Which of the following is the largest ethnic group in china A.Han B.tibetan C. Uighurs D. Hui Which of the following is the staple crop of the north China plain A. Barley B. Rice C. Soybeans D. Wheat Crops grow well on the north China plain because the Huang river ___ A. Forms...
November 24, 2014

Chemistry
Use bond energy values to estimate delta H fro the following reaction in the gas phase: C2H4 + Br2 -> CH2BrCH2Br I am in dire need of help! Thank you
November 20, 2014

Spanish
Hola Sra. Are these correct? La tercera persona plural de pretérito. Cambie las formas entre comillas al pretérito según el ejemplo. Ejemplo: No “han podido” sacar dinero de la máquina. No pudieron sacar dinero de la máquina. Esos ...
November 20, 2014

Math
The ratio of guys to girls in the classroom is 8:1. There are 45 people in the classroom. How many of them are guys?
November 20, 2014

history
what proposal sought to unite the American colonies against the french
November 19, 2014

Math Elementary Linear Algebra
determine whether or not the given set forms a basis for the indicated subspace: #1 {1,1,0), (1,1,1)} for the subspace of R^3 of all (x,y,z) such that y= x+z #2 {[1,2,-1,3), (0,0,0,0)} for the subspace of R^4 of all vectors of the form (a,b, a-b,a+b) and #3 {(2,0,2), (1,1,1)} ...
November 16, 2014

math
when a traffic light turns green, a car accelerates at a constant rate, the decelerates in the same manner to stop at the next traffic light. The speed of the car, s, is given by the equation, s=-10 /t-8/ + 80 where t is time. Find the time , t, it takes for the car to reach ...
November 16, 2014

Math
show that the set of all m-vectors whose first components is 0 (of R^m)
November 16, 2014

Chemistry
What is the molarity of a solution prepared by dissolving 820. g of sodium phosphate, Na3PO4, in water and diluting to 2.89 liters? (atomic masses: Na = 22.99, P = 30.97, O = 16.00)
November 14, 2014

Spanish
Sra. do these look correct? ¿Cuánto tiempo hace que…? Conteste las preguntas utilizando frases completas en español. 1) ¿Cuánto tiempo hace que has escrito una carta a mano? ¿A quién la escribiste y por qué? Hace ...
November 14, 2014

geomerty
how to find the distance between each pair of points (0,3)and (3,-5)
November 14, 2014

Biology*STUCK*
1.b 2.c 3.c
November 12, 2014

Chemistry
Consider the evaporation of water at 298 K and 1 atm pressure: H20 (l) <---> H20 (g) Given that ΔGOrxn= 8.6kJ/mol, what is the equillibrium vapor pressure of water at 298 K?
November 10, 2014

Chemistry
Using the following data 1. CU3+ + 2e- ---> Cu+ E1= 1.28V 2. CU2+ + e- ---> Cu+ E2= 0.15V 3. Cu2+ + 2e- ----> Cu(s) E3= 0.34V 3. Cu+ + e- ----> Cu (s) E4= 0.52V calculate the standard reduction potential for the reaction of Cu(III) to Cu(II). Is it .783 V?
November 9, 2014

Chemistry
Please disregard this question. It's been answered: BaCl2 + Na2S \-> BaS + 2 NaCl
November 7, 2014

Chemistry
A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \->(NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \-> Cu(NO3)2 + 2 NH4Cl Sr(NO3)2...
November 7, 2014

Chemistry
Thank you Dr. Bob, I appreciate your help. I will look at the link. :D
November 7, 2014

Chemistry
A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \->(NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \-> Cu(NO3)2 + 2 NH4Cl Sr(NO3)2...
November 7, 2014

Chemistry
A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \(->NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \->Cu(NO3)2 + 2 NH4Cl Sr(NO3)2 + ...
November 7, 2014

Spanish
Sra. do my answers look correct? Querida Abby… Complete el párrafo abajo por escoger una palabra lógica de la lista siguiente para llenar los espacios en blanco. Querida Abby, Tengo un problema. No sé qué debo ___(1)____. Recientemente, mi ...
November 7, 2014

chemistry
Rank the following elements by electron affinity, from most positive to most negative EA value: tellurium, bismuth, neon, sodium, iodine i tried Te, Bi, Na, I, Ne and it was incorrect.
November 6, 2014

chemistry
K(s)+NH3(g)→ ?
November 5, 2014

Math
2/7
November 5, 2014

trigo
a bicycle has a front wheel with a diameter of 24cm and a back wheel with a diameter of 60cm. through what angle does the front wheel turn if the back wheel turns through 12 radians
November 5, 2014

chemistry
Cloves contain two principal essential oils, caryophyllene and eugenol. A student carrying out a steam distillation using cloves obtained a mixture of these two oils in the distillate. Explain how the student could separate and isolate the two essential oils using liquid-...
November 3, 2014

chemistry
Limone (MW 136g/mol) is a pleasant smelling liquid found in lemon and orange peels. The boiling point of limonene is 175 ˚C, but it co-distills with water at 97.5 ˚C. If the vapour pressure of water at 97.5˚C is 690 mmHg, what percent (by mass) of the steam-...
November 3, 2014

chemistry
Aniline (MW93 g/mol) co-distills with water 98.2 C. The vapor pressure of water at 98.2 C is 717 mmHg. You need to isolate 10 g of aniline. What is the minimum volume of water required to isolate 10 g of aniline in a steam distillation at 760 mmHg?
November 2, 2014

Chemistry
A meteorological balloon contains 237. L of helium at 33. °C and 0.832 atm. If the volume of the balloon can vary according to external conditions, what volume would it occupy at an altitude at which the temperature is -57. °C and the pressure is 0.094 atm? (2 ...
November 1, 2014

Chemistry
Suppose 55.3 L of a gas is at a temperature of -73. °C. If its temperature is increased to 411. °C, what will its volume be then?
November 1, 2014

Spanish
Thank you so much Sra. My assignments aren't due until the following week. Never feel like you have to answer right away.
October 31, 2014

Spanish
Hola Sra ¡Feliz Halloween! Do my answers look right? Part I ¿Ingestión o intoxicación? Traduzca la conversación siguiente al español utilizando los tiempos compuestos como apropriado. Es importante usar el tono formal (Ud.) ya que una ...
October 31, 2014

Spanish
Sra. are these three correct? I have a short assignment this week. Thank you! Conteste las preguntas utilizando el pluscuamperfecto de indicativo según el modelo. Use el mismo verbo que se usa en la pregunta. Modelo: ¿Por qué no nos ha dicho la verdad ella...
October 23, 2014

Chemistry
How would you prepare 165 mL of a 0.976 M NaOH solution, starting with a 6.36 M stock solution? Volume of solution needed? Volume of water needed?
October 21, 2014

Algebra
I don't understand how to find the equation to solve this. A family drove two cars to a reunion. The first car traveled at 50 mph. The second car left 1 hour later and traveled at 65 mph. How long will it take for the second car to catch up to the first car?
October 21, 2014

algebra
has inherited $15,000 that she wants to invest in two separate accounts, one paying 4% and one paying 3% annual interest. If the total interest earned for a year is $550, how much should she invest at each rate?
October 21, 2014

science
what force is applied by Andre if he does 250 J of work as he pushes a box 19 M along the ground ?
October 19, 2014

Spanish
I'm so sorry. I did type #9 wrong. It is... Xavier, “quiero que le preguntes” al dependiente si hay un restaurante cerca. Xavier, __________ al dependiente si hay un restaurante cerca. My answer is: pregúntale Thank you so much for your help! It seems with...
October 17, 2014

Spanish
Sra. this week I had a review. Do my answers look correct? Part I Indique si las palabras en pares son sinónimos, antónimos, o no son relacionadas. 1. A ancho y apretado - antónimos B corto y flojo - no son relacionadas C vestirse y quitarse - antó...
October 17, 2014

Algebra
I still don't get it, where do I simplify at? Fractions aren't my strong point.
October 16, 2014

Algebra
Solve for x in each of the following: A: 2/3 = x/18 B: 3/x = 3x/x^2 I think I have the first one. I am clueless on the second one! HELP!
October 16, 2014

Chemistry
A compound containing boron and hydrogen has been synthesized. You perform two experiments to determine the molecular formula of the compound. A 0.492 g sample of the compound is burned in pure oxygen to produce B2O3 and 0.540 g of water. In the second experiment, when a 63.1 ...
October 15, 2014

Math
4.355
October 15, 2014

physics
A man threw a ball horizontally out of an elevator that was traveling upward at a rate of 5.50m/s. If the ball was thrown at a velocity of 10.5m/s when the elevator was 15.3m above the floor of the atrium. How far from the base of the elevator did it land?
October 15, 2014

math
Determine whether the fractions in each of the following pairs are equal: a: a^2/b and a^2b/b^2 b: 377/400 and 378/401 c: 0/10 and 0/-10 d: a/b and a+1/b+1, where "a" is not equal to "b" or a =/= b
October 14, 2014

Spanish
Sra. do these look correct? Part I Entonces, complete el diálogo telefónico en una manera lógica utilizando oraciones completas en español. 1. Dígame. Hola. ¿Puedo hablar con el señor Costa? 2. ¿De parte de quién? ...
October 10, 2014

B sometime
B sometime
October 9, 2014

Engineering
what heading must a pilot fly to compensate for a 125km/h west wind to have a ground track that is due south? The airecraft cruise speed is 600 km/h. What is the actual ground speed?
October 8, 2014

chemistry
How many moles of molecules are in 198 g of hydrogen nitrate (HNO3)? Answer in units of mol
October 6, 2014

Pre-Calc
1.) Suppose that y varies directly as x. If y is 5 when x is 30, the constant of variation is 150. True Or False 2.) If w varies directly as z and w = 9 when z = -6, find w when z = 3. 3.) If y varies directly as x and y = 2 when x = 4, find x when y = 4.
October 2, 2014

Spanish
Thank you for your corrections Sra. I am not sure why I was so confused about the second part. I thought I was using indicative imperfect but I was so wrong. At least the subject half was ok. As for gustar I should have known better. I always get tricked with that verb. Thank ...
October 2, 2014

Spanish
Sra. are my answers correct? Thank you so much for your time. Part I El condicional. Llene el espacio con la forma condicional del infinitivo dado. ¡Cuidado! Los acentos son importantes. 1. Mi esposo y yo _______ contigo, pero no nos sentimos bien. (IR) iríamos 2...
October 2, 2014

Math
if jerry bought 6 shoes for 85 dollars, how much would fred have to pay for 17 pairs at the same rate?
October 2, 2014

math/ unit rates
5/32
September 28, 2014

physics
A geosynchronous satellite is one that appears to be fixed in the sky, a condition useful for telecommunications. If such a satellite orbits the earth at an altitude of 33000 km above the earth's surface, what is its centripetal acceleration? The radius of the Earth is ...
September 27, 2014

physics
A basketball is thrown at 45° to the horizontal. The hoop is located 4.4 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed?
September 27, 2014

Spanish
Sra. would you look over my answers please? Part I. El subjuntivo con expresiones hipotéticas: Complete las frases siguientes utilizando EL SUBJUNTIVO. Ejemplo: No completaré la tarea hasta que... estudie los verbos. My answers are after the ... on each 1. Ser&...
September 26, 2014

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