# Posts by gloria

Total # Posts: 276

Physics
In a simple machine, the energy input is 120j. If the efficiency of the machine is 80%. Calculate the energy output

Information systems
Is video conferencing really a viable green alternative to travel for most companies

Chemistry
At 3745°C, K = 0.093 for the following reaction. N2(g) + O2(g) equilibrium reaction arrow 2 NO(g) Calculate the concentrations of all species at equilibrium for each of the following cases. (a) 2.0 g N2 and 3.0 g O2 are mixed in a 1.3-L flask. [N2] [O2] [NO] (b) 1.5 mol ...

U.S. History (help)
In the U.S. House of Reps. When California gains a representative, then another state must have what? How often can the number of representatives be adjusted? After a what?

calculus
Use implicit differentiation to find an equation of the tangent line to the curve 3xy^3+4xy=63 at the point (9,1)(9,1).

calculus
A spherical balloon is inflated so that its volume is increasing at the rate of 3.2 ft3/min. How rapidly is the diameter of the balloon increasing when the diameter is 1.1 feet?

explore career
If john got paid \$12.00 an hour and he worked 40 hours, how much is his gross pay?

98.547/4.93 985-493=437 4377-4437=4877 4877-4437=4400 here's where we get stumped the calculator shows we should have a 9 in out answer

Math
find four consecutive odd integers such that the sum of the least integer and greatest integer is 164

Math
Find the volume of a cone with a radius of 4yd and a height of 10yd.round to the nearest tenth.

Math
If Mary ate two apples and Bob ate three apples, how many apples did Mary eat.

Geography
South Africa

PHYSICS
A cell phone emits signs in approximately 750 Mhz. Which is the wavelength and energy of this radiation

Chemistry
2.16 grams of silver react with 3.20 grans of sulfur.Caculate the mass of silver sulfide produced (mass of ag=108.8g/mole)

English,sepedi,agriculture,economics,lifesciences,maths literacy & life orientation
Identify 3human rights violations or discrimination and explain in an introductory paragraph why you choose the specific human rights violation or discrimination

Physics
A block is attached to a spring and set in motion on a horizontal frictionless surface by pulling the block back a distance 10cm from equilibrium. Now, replace the block with one double the mass and set the block into motion again by pulling the block a distance 10cm from ...

Pre-algebra
Thank you John this helped me confirm that my calculations were right.

Pre-algebra
Which expressions are equal to 120 Multiple chose 1. 5! 2. 6! 3. 6p3 4. 12p10 I think the answers are 5! and 6p3

Sociology
I need help writing the essay

Sociology
Write a 700- to 1,050-word essay in which you complete the following: Give a brief introduction that identifies the issue you have chosen and why.Describe in three separate paragraphs how each perspective would view or explain the issue.Include in your analysis elements ...

Family Dynamics
One important approach for teachers working with diversity in individual families is to be __________________.

Statistics
for a population with m=62 and s=12, find the x value that corresponds to esch of the following z-scores: -0.25,-1.50,0.50,2.00

Science
B C B A

statisitics
The mean age at which men in the United States marry for the first time follows the normal distribution with a mean of 24.4 years. The standard deviation of the distribution is 2.6 years. For a random sample of 57 men, what is the likelihood that the age at which they were ...

physics
you walk west for 52 m, then you walk 33.2° north of west for 44 m, and finally you walk due north for 25 m. Find the components of your final displacement, from your initial to final point, along the north and west directions.

Help please! I have a test next week!

The Kw of water varies with temperature. Calculate the pH of water at 46℃ with a Kw=1.219 x 10 to the negative 14th.

Chemistry
The following unbalanced equation describes the reaction that can occur when (II) sulfide reacts with oxygen gas to produce lead (Il) oxide and sulfur dioxide gas: PbS+O2---> PbO + SO2 Balance the equation and describe in words the electron transfers that takes place.

Chemistry
Would please work the problem with me? Thanks!

Chemistry
Anyone help me through the steps, please?

Chemistry
Iron -59 has a half -life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to a solution.

Math
1.B 2.C 3.B 4.D I'm in connections academy and I just the test and number 4 is D no questions about it 4 IS D.

Chemistry
If 5.40 kcal of heat is added to 1.00 kg of water at 100C, how much steam at 100C is produced? sHOW ALL CALCULATIONS LEADING TO AN ANSWER. Q=m*Hf 5.4=m*80 m=5.40/80=0.0675kg

Math
1.C 2.A 3.B 4.B 5.C 6.C 7.D 8.C I'm in Connections Academy and just took the quiz and I got a 6/8 so these answers are absolutely correct.

Math
Hi! I need help with this question. Thank you! Directions: Write the expression for the nth term of the following geometric sequence. 5, 10, 20, 40, ...

math
40

Math (ASAP)
I think for the first one the answer is 2 but the second one I'm not sure about?

Math (ASAP)
Solve the following inequalities. 1.) 3x + 2y < 6 2.) 2x^2 + y ≥ 2

Math
Sorry, the x's and y's got put in there by mistake. I only want the top equations solved. 1.) 3x + 2y < 6 2.) 2x^2 + y ≥ 2

Math
Directions: Solve the following system of inequalities. 1.) 3x + 2y < 6 x > 0 y > 0 2.) 2x^2 + y ≥ 2 x ≤ 2 y ≤ 1

Science
It is B you are correct.

chemistry
I don't quite understand the last step! Can you help me? I have a test next week!. Thanks!!

Computerized Accounting
Consider this statement: "QuickBooks records revenue when an invoice is generated, even though cash has not been received." Is this practice acceptable? Why or why not? What are noncash investing and financing activities, and how are they recorded in QuickBooks?

Accounting
Consider this statement: "QuickBooks records revenue when an invoice is generated, even though cash has not been received." Is this practice acceptable? Why or why not?

history
roosvelts phisophy and goverment

science
name four phylum under the five kingdoms

1.A/C 2.B 3.B 4.D 5.C 6.D 7.B 8.A 9.C 10.B

Science

Spanish
Quién le recomendó ese plato? (su tío) Su tío se lo recomendó.

Algebra
you need 3 3/4 yards of material for 1 shirt how many shirts can you make with 116 1/4 yards of material

As preserve makes headway into the larger retail chains, what challenges will it face?

chayyenne
A 26' long painting is how many yards long?*

algebra
A grocery store sells four different jars of peanut butter. Determine which is the best? buy, based on the cost per unit. 14 ounce for\$1.71 28 ounce for \$2.94 24ounce for \$2.57 34 ounce for\$3.30

Chemistry
please say if molecule is polar or nonpolar: H2 HBr BrCl CS2 H2S

chemistry
you have a metal tank containing 74.0moles of nitrogen gas at a pressure of 15.0atm.If the pressure is measured at a temperature of 20.0c,then the volume of the tank must be how many liters(Round answer to one decimal place.

Chemistry
when the pressure on 2.5liters of oxygen is decreased from 2.0atm to 1.0atm,the volume of the gas becomes how many liters.(round answer to one decimal place.

Patterns,Algebra ans Functions
This line represents the line on a graph tha shows how long it took Khalil to walk to school.The horizontal axis shows the time and the vertical axis shows blocks covered.Explain what you think happened on Khalil's way to school?

mary smith purchased a new car for \$28,750. she made a 15% down payment and financed the balance at her bank for 3 years. what payments are required at the end of every month, at 18% interest, to pay off the loan?

Do you think rounding borderline letter grades up or down is a fair practice? Or should they just stay where they are? For example, I think that an 89.5% should round up to a 90%. I have one instructor right now who considers an 89.99% to still be a B plus. It seems a bit ...

physics
If motor M exerts a force of F=(10t2+100)N on the cable, where t is in seconds, determine the velocity of the 25kg crate when t=4s . The coefficients of static and kinetic friction between the crate and the plane are μs=0.3 and 0.25 μk=0.25 . The crate is initially ...

Statistics
Draw nine cards from a deck of 52. What is the probability of drawing 4 red, 2 or more reds, 2 or fewer reds, and exactly 5 reds

math
I am trying to help my grandson with a fraction problem, Mary has 12 marbles 3/12 are yellow,2/12 are blue and the rest are green, I need to explain how many of them are green where he will understand

math modeling
A spherical balloon has a radius of 11 centimeters. If we increase the radius by 2 centimeters, how much did the volume increase?

English Vocabulary fill in the blank
Need help with action verb

Analytical chemistry
Thank you very much!

Analytical chemistry
I did the next problem, i don't have the results for it and i just want to know if i calculated the mass for Fe2O3 the right? A sample is a mixture of iron oxides (Fe2O3 and FeOOH). It's known that at 200°C this reaction occurs: 2FeOOH(s)-> Fe2O3(s) + H2O(g) A 0...

Analytical chemistry
What is a pH of 20 mL of 0.08 M NH3 added to 40 mL of 0.04 M HCl? NH3 + HCl = NH4+ + Cl- c(NH3)=(0.02L * 0.08M)/0.06L= 0.02667 M c(HCl)=(0.04L * 0.04M)/0.06L= 0.02667 M c(NH4+)=c(HCl) Kb=[NH4+][OH-]/[NH3] Kb=1.76*10^(-5) So i tried to calculate it like this: Kb=[OH-] pOH=4....

chemistry
you will have to use this two formulas p*V=n*R*T n=m/M p*V=(m/M)*R*T p*V*M=m*R*T M=(m*R*T)/P*V then just make sure you convert units right (i hope i did convert them right, if not then correct me) M=(0.311g*8.314L kPa*328.15K)/(mol*K*118.124 kPa*0.225L) M=31.924 g/mol

Chemistry
NaHCO3 + HCl -> NaCl + CO2 + H2O n(NaHCO3)=n(HCl) n(NaHCO3)=m/M=2.3g/83.99*(g/mol)=0.027384 mol m(HCl)=n*M m(HCl)=0.027384 mol * 36.46 (g/mol)= 0.9984 g

Analytical chemistry
First of all, thank you so much for answering and i'm sorry for writting all the problems at once. I won't do that anymore in the future. #5 i was looking at the different problem with my result, that's why i wrote the concentration :S #9 thank you, i just realized...

Analytical chemistry
Below i wrote a few problems, i did them all but in the book i don't have results, so i don't know if i did them right or not. I would really appreciate if someone would go through the problems and tell me if i got the right results. If i made a mistake somewhere ...

Analytical chemistry
Maybe there was a mistake in the book, because i always get the result higher than 100%

Analytical chemistry
It's ok. Thank you for the help.

Analytical chemistry
That was all that was given

Analytical chemistry
The iron in a 0.6656 g ore sample was reduced quantitatively to the +2 state and then titrated with 26.753 g of KMnO4 solution. Calculate the percent Fe2O3 in the sample. the mass i get for fe2o3 is too big, but i don't know how else to do this problem, someone please help...

Analytical chemistry
thank you so much, again :)

Analytical chemistry
A Kjeldahl analysis was preformed upon a 0.055 g sample of impure biguanide (C2H7N5, fw=101.1). The liberated ammonia, collected in 40 mL of 4% boric acid was titrated with 19.51 mL of 0.1060 M HCl. Calculate the percentage of biguanide in the sample. (Result: 76%) This is how...

Analytical chemistry
Thank you both so much

Analytical chemistry
A dilute perchloric acid solution was standardized by dissolving 0.2445 g of primary standard sodium carbonate in 50 mL of the acid, boiling to eliminate CO2, and back-titrating with 4.13mL of dilute NaOH. In a separate titration a 25mL portion of the acid required 26.88 mL of...

Analytical chemistry
Thank you very much for your help :)

Analytical chemistry
A 5ml portion of table wine was diluted to 100 ml in a volumetric flask. The ethanol in a 20 ml aliquot was distilled into 100 ml of 0.05151M K2Cr2O7. heating completed oxidation of the alcohol to acetic acid: Ch3Ch2OH + 2Cr2O7(2-) +16H(+) -> 3Ch3COOH + 4Cr(3+) + 11H2O ...

Analytical chemistry
Thank you so so so much! You're great!

Analytical chemistry
A 25 ml sample of household bleach was diluted to 500 ml in a volumetric flask. An unmeasured excess of potassium iodide was aded to a 20 ml aliquot of the diluted sample; the iodine liberated in the reaction: OCl- + 2I- -> I2 + Cl- + H2O required 34.5 ml of 0.0409 M ...

math
a particle moves along the x-axis so that its velocity is proportional to x^2. Prove that its acceleration is proportional to x^3

life orientation
peer pressure, bravado,employment levels,religion, politics, culture and society

substance
10-15 lines critically discuss 5 ways in which the human problem impacts on the community

nutrition
5 ways in which human or environmental problem impacts on the community

health
name 5 ways which human or environmental problem impacts on the community

Algebra 1
If the side of a rectangle measures 10.5 cm to the nearest millimeter,what is the upper bound and lower bound of the side of the rectangle?

medical terminologhy
combining form and suffix to form number 1 abnormal softining of a kidney

Algebra
C B C C D

life orientation
.working almost 50 hours per week. .working on holidays without extra remuneration. .working during lunch break in order not to lag behind with the work. .going to work when you are ill. .giving some employees a work wich is not their duties.

math 5th
steve wants to make a rectangular pen for his guinea pig with 20 yards of fencing. what is the greatest area the pen can have

Science
State in words the specific information conveyed by a label reading 0.25M Oxalic acid.

history
11. What geographic feature at times made life difficult for the Moche of South America?

Chemistry
When 50.0g of silicon dioxide is heated with an excess of carbon 32.2 g of silicon carbide I'd produced. SiO2(s) + 3C(s) → SiC(s) + 2CO(g) A. What is the percent yield of this reaction? B. How many grams of CO gas are made?

Jefferson
Nitric acid and zinc react to form zinc nitrate, ammonium nitrate, and water. 4Zn(s) + 10HNO3(aq)→ 4Zn(NO3)2(aq) + NH4NO3(aq) + 3H2O(l) A. How many atoms of zinc react with 1.49g HNO3? B. Calculate the number of grams of zinc that must react with an excess of HNO3 to ...

Math
Three people who work full-time are to work together on a project, but their total time on the project is to be equivalent to that of only one person working full-time. If one of the people is budgeted for one-half of this time to the project and a second person for one-third ...

pre algebra
Actual train size 40 feet gives a model size of 3 inches which scale was used?

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