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# sisy j

• ### what is the difference between a serger and an overlocking/ I am new to sewing and just found out what a serger is and how useful it is..?

not sure the difference, came across something that is called a serger on one spot then a overlocking machine in another. says it does 21 stitches.

1 AnswerHobbies & Crafts3 years ago
• ### Calc help please? I have no idea how... The​ demand, D(x), and​ supply, S(x), functions ...?

The​ demand, D(x), and​ supply, S(x), functions for a certain type of multipurpose printer are as follows. Find the equilibrium point. Assume that x is the price in dollars.

D(x)=q=470e^-0.002x

S(s)=q=170e^0.003x

a. find the equilibrium price x=

b. and the equilibrium numbers of printers is q=

I believe for a. I need to set them equal to each other but I end out with e's and x's on both sides I'm not sure how to handle it.

all help is greatly appreciated.

• ### chemistry kc/kp problem?

I've got the answer I just dont understand how this works at all. can someone explain please:

Given a Kc of 9.30 x 10-8 for the following reaction at 298 K, determine the Kp and the equilibrium amounts of each reagent in the mixture. At the start of the reaction there is 0.45 mol H2S in a 3.0L container.

I understand that the molarity of the H2s=.15 initial but I don't understand the rest...

k=4x^3/(.15-2x)^2=9.3E-8

[S2]=8.06E-4

[H2]=1.61E-3

[H2S]=.148

Kp=2.27E-6

• ### Consider the titration of 100.0 mL of 0.200 M CH3NH2 by 0.100 M HCl. (Kb for CH3NH2 = 4.4×10-4)?

This problem has multiple parts, I'm not sure if what I am doing is correct of not, so if someone can walk me through it I would really appreciate it. I will notate the answers I have come up with and please elaborate or correct.

Part 1

Calculate the pH after 0.0 mL of HCl added.

pH = 2.18pH? or 11.82ph?

Part 2

Calculate the pH after 20.0 mL of HCl added.

pH = 4.4 ?

Then I didn't try the rest cause I am not sure if Im doing it correctly. all help is appreciated.

Part 3

Calculate the pH after 65.0 mL of HCl added.

pH =

Part 4

Calculate the pH at the equivalence point.

pH =

Part 5

Calculate the pH after 300.0 mL of HCl added.

pH =

Part 6

At what volume of HCl added, does the pH = 10.64?

mL

• ### Got another chem problem that is crazy. A tutor spent 3 hrs with no certain solution?

In an adiabatic calorimetry experiment, 100mL of 0.500 M HCl was added to 100 mL 0.500M NaOH to produce 200 mL 0.25 M NaCl. A temperature increase of 3.38DegC was measured.

a. calculate the heat of reaction associated with this process at 25 deg C for one mole of reactant and for the reaction conditions used.

b. use this value to calculate the heat capacity of the system Ctotal.

• ### Transform the polar equation to an equation in rectangular coordinates.?

theta = 7pi /4

What is the​ slope-intercept form of the equation in rectangular​ form?

I have looked everywhere in my book and through the internet study guide and no where does it show how to do this. All help is appreciated

• ### Spanish help please. Directions:?

Ramón is going to San Juan, Puerto Rico, with his friends, Javier and Marcos. Express his thoughts more succinctly using direct object pronouns. Follow the model.

Modelo

Quiero hacer una excursión.

Quiero hacerla. or

La quiero hacer.

1. Voy a hacer mi maleta.

Voy a la hacer.

2. No necesitamos llevar los pasaportes.

No necesitamos los llevar.

3. Marcos está pidiendo el folleto turístico.

Marcos la está pidiendo.

4. Javier debe llamar (call) a sus padres.

Javier los deve llamar.

5. Ellos esperan visitar las playas.

Ellos las esperan visitar.

6. No puedo llamar a Javier ahora mismo.

No puedo lo llamar.

• ### Hello, I'm not grasping how to do this assignment. can someone explain how to do these and give answers so I can learn from it?

It's an online class so I can't just ask for an explanation.

Ramón is going to San Juan, Puerto Rico, with his friends, Javier and Marcos. Express his thoughts more succinctly using direct object pronouns. Follow the model.

Modelo

Quiero hacer una excursión.

Quiero hacerla. or

La quiero hacer.

Voy a hacer mi maleta. (Attempt: Voy a hacer)

No necesitamos llevar los pasaportes. (Attempt: Necesitamos no los llevar.)

Marcos está pidiendo el folleto turístico.

Javier debe llamar (call) a sus padres.

Ellos esperan visitar las playas.

No puedo llamar a Javier ahora mismo.

I just know I am doing this wrong. any help is appreciated.

• ### more spanish help please. I don't understand what they want from me. The directions are?

Ir a + infinitivo Rewrite each sentence, changing the verb in the present tense to the near future.

the sentences are as followed

¿Vuelves a casa?

there is a blank to fill where the brackets are in each question. I wrote and was marked wrong for what is in the brackets.

[Vas a vuelves] a casa

Ustedes visitan a su familia.

Ustedes [va a vistan] a su familia.

Yo no hago la tarea todos los días.

Yo no [voy al hago] la tarea todos los días.

Celinda y Roberto ganan el partido.

Celinda y Roberto [van a ganan] el partido.

Mi hermano y yo salimos los sábados.

Mi hermano y yo [voy a salimos] los sábados.

Luis juega al golf.

Luis [va a juega] al golf.

thanks for any help, it would be nice if they gave an example. I have obviously not understood the type of answer they are seeking.

I took a quiz and have been marked wrong and I don't understand why, can someone help tell me how these are wrong and what they want from me?

10. Write the correct nationality adjective to complete the sentence.

12. Write the correct nationality adjective to complete the sentence.

Las niñas son japonesa

13. Write the correct nationality adjective to complete the sentence.

have 3 wrong in this. My answers are in caps.

Read the sentence, then complete the next sentence with the correct possessive adjective.

1. Yo tengo 3 hijos. SUS hijos son Aaron, Camille y Chris.

2. Tú tienes cinco lápices rojos. TU cinco lápices son rojos.

4. El padre de todos nosotros es un buen hombre. NEUSTRO es un buen hombre.

5.Las hermanas de mi madre son muy buenas. SU hermanas son muy

Thanks for any help. It is frustrating taking online classes

• ### trig problem I cant figure out tan(x-y)=tanx-tany/1+tanxtany. tanx=-4/3 tany=root15/7?

so (-4/3 - root15/7)/1+(-4/3)(root15/7)

getting -28-3root15/1-4root15

reduced to 31/4? that answers is wrong... what have I done?

• ### Tan 23degrees=cot? I am new to trig, and have not grasped the correct conversions and procedures yet. how would I tackle this step by step?

please. thanks for all the help

• ### How much of a 1.35 M sodium chloride solution in?

milliliters is required to completely precipitate all of the silver in 25.0 mL of a 0.40 M silver nitrate solution?

I'm not sure what I am doing wrong.

Balance equation:

NaCl+AgNO3=NaNO3+ACl

Here is what I have

.025L AgNO3 * .4M AgNO3 * 1mol NaCl/1mol AgNO3 * 1LNaCl/1.35M Nacl=.0074L 7.4*10^-3 or 7.4 * 10^-6mL and it is coming up wrong.

• ### Graph the solution set of the system of inequalities. I don t know how to approach this? x^2+y^2<4 and y-x^2 less than or equal to 0?

can someone walk me through this step by step so I can learn? Help is greatly appreciated

• ### 2 more Chemistry questions. I am completely lost on how to approach these. Can someone please walk me through the steps so I can learn?

How many liters of H2 gas, measured at 741 mmHg and 84 ∘C, are required to synthesize 0.50 mol of CH3OH?

Given:

CH3OH can be synthesized by the following reaction:

CO(g)+2H2(g)→CH3OH(g)

then:

If 320 mL of hydrogen gas is collected over water at 25∘C at a total pressure of 744 mmHg , how many grams of Zn reacted?

Given:

The following reaction is carried out as a source of hydrogen gas in the laboratory:

Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)

thank for all the help.

• ### Ok, got another Chemistry question.?

ok, I've got 3Ba(s)+N2>Ba3N2

Which element is being oxidized, the is Ba correct?

Then how many electrons does the element being reduced gain?

What, how, N2 has -3 right, so it would need to gain 4?but Ba only has 2 per, and when I looked up oxidation number of N2 I found 0, can someone explain this?