# Posts by ANDREA

Total # Posts: 882

**math**

express the sum of difference in simplest form 1-1/6-11/18=

**Physics**

The pulley system shown in the figure is used to lift a 37 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are negligible and the crate is...

**Gen Chem**

ignition of mgnh4po4*6h2o produces nh3, h2o and magnesium pyrophosphate, Mg2P2O7. complete and balance the equation for this reaction. If 5.00 g of MgNH4PO4*6H2O are ignited, how many grams of Mg2P2O7 would be formed? 2MgNH4PO4*6H2O(g)--->

**Gen Chem**

I got the answer of 249.6 Is that correct? Thanks for your help!

**Gen Chem**

what is the formula weight for CuSO4 5H2O?

**Gen Chem**

epsom salts, household ammonia, and rubbing alcohol are also consumer chemicals that could be used in this experiment. what are the chemical formulas for these substances?

**Gen Chem**

For my chem class I have 3 elements and have to find what they are used for today or an interesting fact. I have looked but I can't really fin anything. My elements are: Cobalt,Thulium, and Roentgenium I found that cobalt is used in money (nickels, quarters, and dimes, but...

**Chemistry**

Balance the equation and write the reaction-quotient expression, Qc. U(s) + F2 (g) <----> UF6 (g)

**Algebra**

How do the solutions of the equation compare to the length of the rectangular object and the x-intercept of the graph? Provide both the solutions and measurement. x^3-10x^2+21x -108 = 0 Length: 9 inches Height: 6 inches Width: 2 inches

**Algebra II**

Can you make sure my Algebra II work is correct? I've done the problems. I just want to make sure I am right. 1. Write an equation of the line with a slope of 5 and a y-intercept of -3. y=5x-3 2. Write the equation of a line that passes through (9, 3) and has a slope of 2/...

**Break-Even Analysis**

Given: Jay Letterman has just (year: 2012) become product manager for Avenir. Avenir is a consumer product with a unit retail price of $1.00. Retail margins on the product are 33%, while wholesalers take a 12% margin. Avenir and its direct competitors sell a total of 20 ...

**algebra**

m=rise/run =18/4 =9/2

**Finance**

Given: Jay Letterman has just (year: 2012) become product manager for Avenir. Avenir is a consumer product with a unit retail price of $1.00. Retail margins on the product are 33%, while wholesalers take a 12% margin. Avenir and its direct competitors sell a total of 20 ...

**Ella Minnow Pea**

I read the book Ella Minnow Pea for school... And I actually enjoyed it! But I have to answer some questions about it and I'm not quite sure what I am suppose to be answering. Do you understand these questions better than me? Here they are! Identify the stylistic devices ...

**us history**

I WILL pass that test. And the class was free so no money was wasted.

**us history**

I'm not going to drop the class. And due to some personal issues(No not pregnancy)I am taking online school. They did not issue us books therefore I am going in basically blind. Like I said, I'm trying to get a tutor.

**us history**

Can you help me on this? How consistent were the republican principles applied by Thomas Jefferson and James Madison during their presidencies? How did their policies affect the Federalist Party during Jefferson's and Madison's administrations? I can't find the ...

**History Help?**

How did the compromises made when writing and ratifying the Constitution encourage the development of political factions? Compare and Contrast the effectiveness of Washington's and Adams' presidencies in obeying and promoting the Constitution during their administrations.

**us history**

Evaluate the extent to which the Articles of Confederation were effetive in solving the problems that confronted the new nation. Does anywone know where I can find the answer to this? I have to type a whole page on it so I need a lot of information... please and thank you! No ...

**AP US History**

Well... despite the fact that I am not good at history I did sign up for the class and I AM STICKING WITH IT. I am not going to swtich out. Thank you for your time, however, my descision to stay in the class will not be swayed. I do need help with it however, and I am looking ...

**AP US History**

How did the compromises made when writing and ratifying the Constitution encourage the development of political factions? Compare and Contrast the effectiveness of Washington?s and Adams' presidencies in obeying and promoting the Constitution during their administrations. ...

**AP US History help?**

I will do that. Thank you!

**AP US History help?**

I know this is really long... but I can't figure it out for the life of me. If you don't want to answer the whole question that is fine. I'm greatful for whatever I can get. Also links to websites with the information is also helpful. Thanks!! Directions: Read the ...

**algebra**

Thank you Steve for your help!

**Stumped at Algebra II**

How in the world do you do this? I'm so confused. Thank you all for your time and help... -2 < 2x - 5 < 3

**algebra**

Solve for y, xy + x = -3 How do you do this? I can't seem to come up with the correct answer...

**algebra**

how do i complete the table with 4x-y=5 x: 0 1, 2 and im trying to find 'y'

**Algebra**

solve the linear system using substitution 4x - y=5 4x + 4y= -4 Also by using elimination.

**Chemistry**

How do you convert it to moles of asprin?

**Chemistry**

Aspirin (C9H8O4) is synthesized by the reaction of salicylic acid (C7H6O3) with acetic anhydride, C4H6O3. 2C7H6O3 + C4H6O3 −→ 2C9H8O4 + H2O When 19 g of C7H6O3 and 19 g of C4H6O3 react, which is the limiting reagent?

**algebra**

Damon, thank you so much!! This helped a lot!

**algebra**

Hi, I need some help on my homework. Can you help me? True or False, if False correct the underlined portion. 1) If 3<x, then 3+y<x+y 2)If |w-7|<-3, then w-7>-3 or w-7<3 3) If -4<-2t+6<10, then 2>t+6>-5 4) If |y+8|+2=6, then y+8=+-4* * the "+&...

**AlgebraII**

How do you get the answer for this equation a+2b+(14a-5b)-[6a+6b-(a+4)]

**physics**

which natural phenomenon can describe light as a wave?

**chemistry**

The height of a stack of 5 pennies is 0.72 cm and the radius of the stack is 0.91 cm. The volume in mL of this stack of 5 pennies is...

**Math**

WHERE DO I PUT THE PERENTHESIS TO MAKE THIS STATEMENT TRUE: 18+2*1+3 TO THE SECOND POWER

**medical billing and coding**

Your search for This 82-year-old female was admitted for acute exacerbation of chronic obstructive pulmonary disease. The progress notes indicate that the patient received a transfusion for anemia. The discharge diagnoses state acute exacerbation of chronic obstructive ...

**chemistry**

treatment of a 0.400g sample of impure potassium chloride with an excess of AgNO3 resulted in the formation of 0.733g of AgCl. calculate the percentage of KCl in the sample. show balanced equations in support of your answer

**math**

In a family of 5 children, how many different ways can you have 3 boys and 2 girls?

**math**

Thanks, Steve. I believe we were supposed to convert the 16 inches into centimeters first (which is 40.64 cm, right?) to solve for both V and A and then take our final, not-rounded answer, convert it back into inches, and then round.

**math**

Find the volume and surface area of a right cylinder with radius 7.5 cm and height 16 in. Make sure your final answer is in inches. Round your answer to the nearest hundredth.

**math**

Thank you, Ms. Sue and Vanessa! I thought this might be a trick question, and that perhaps the correct answer was 2 (keeping logs whole).

**math**

Mr Logan can saw 8 logs in 3 hours. How many logs can Mr Logan saw in one hour?

**medical billing/coding**

I need help coding this question. could someone help me. CPT CODE:__________________________ ICD-9-CM CODE:_____________________ Code the following "You've started your first day at Venture Outpatient Surgery Center. OPERATIVE REPORT: Preoperative diagosis: Left flank...

**medical billing and coding**

what are the CPT and ICD-9-CM codes for following question? "this is a pleasant female who comes in with a soft tissue lesion in the left flank over what appeared to be a spigelian hernia site as well. However, it was not reducible and did not appear to be consistent ...

**Physical Science**

1. You are assigned to take care of a patient who is scheduled to undergo a surgical operation. The doctor told you not to allow the patient to eat for twelve hours. How many minutes is the fasting period? 2. What is the density of a rock (in g/cm3) which has a volume of 2.5 ...

**geometry**

If m∠BCD = 60 and m∠DEC = 80, what is the measure of ∠DEF

**business**

ACTUAL DECISION / PREDICTED DECISION A B C A 80 5 12 B 14 60 14 C 10 15 70

**business**

A researcher was given the assignment of predicting which of three actions would be taken by the 280 employees in the Desota plant that was going to be sold to its employees. The alternatives were to: a. Take severance pay and leave the company. b. Stay with the new company ...

**geometry**

Length of CD would be 26.

**geometry**

a circular cylinder has a base with a radius of 7.5 cm. and a height of 12 cm. a rectangular prism has a square base and height of 8.0 cm. if the cylinder and the prism have equal volumes, what is the length of the base of the prism to the nearest tenth?

**Algebra**

f(x)=x^2-1 ; x = -3, -2, -1, 0, 1, 2, 3 i got 8,3,0,-1,0,3,8 as the answer when i plugged in x. how would i graph these numbers from this function?

**Econ**

Do people living in countries with higher real GDP necessarily have better living standards compared to countries with relatively lower GDP? Give practical example. 2. What measures would better compare the well-being (living standard) for residents of different countries? How...

**Chemistry**

Which of the following pairs of compounds will give a precipitate in a diluted solution?** a) Cu(NO3)2 and Na2CO3 b) KNO3 and NaCl c) MgCl2 and Ba(NO3)2 d) NH4Cl and Al2(SO4)3 A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the precipitate(s) be? a) AgOH b...

**Chemistry**

Acetic acid dissociates/ionizes itself as follows: CH3COOH(aq) ⇔ H+(aq) + CH3COO-(aq) If you add sodium acetate, CH3COONa, to the solution: a) a precipitate will be formed b) more acetic acid will be ionized c) the concentration of hydrogen ions will decrease d) the ...

**Chemistry**

A mixture of lead, magnesium, nitrate and chromate ions are present in a solution. What will the precipitate be?** a) MgPb b) Pb(NO3)2 c) PbCrO4 d) MgCO3

**Chemistry**

Consider the reaction 3X + Y ⇔ 2W + Z. At equilibrium, [X] is 7.0 M, [Y] is 6.0 M, [W] is 5.0 M and [Z] is 7.0 M at 298 K. The value of the equilibrium constant at this temperature is: a) 0.085 b) 0.560 c) 1.800 d) 11.760

**Chemistry**

0.80 mol/L of A and B are mixed. They react very slowly to produce C and D as follows: A(aq) + B(aq) ⇔ C(aq) + 2D(aq) When equilibrium is attained, the concentration of C is 0.60 mol/L and the concentration of A is: a) 0.20 M b) 0.40 M c) 0.60 M d) 0.80 M

**Chemistry**

In the system A(g) + 2B(g) ⇔ 2C(g) + 2D(g) ΔH=21 kJ/mol, it is possible to increase the quantity of C by: a) adding a catalyst b) decreasing the [B] c) increasing the pressure d) increasing the temperature

**Chemistry**

For the following acids: i. CH3COOH ii. HNO2 iii. HCN a) What is the dissociation equation in an aqueous solution? b)Give the KA expression for each of the acids. c)Identify the acid-base pairs.

**Chemistry**

A weak acid solution, HX 0.37 M, has a pH of 3.70. Calculate the acidity constant for this acid.

**Chemistry**

Calculate the volume of Ba(OH)2 0.20 M necessary to neutralize 300.0 mL of H3PO4 0.30 M. (4 marks)

**chemistry**

What is the pH of a solution prepared by dissolving 12.2 g of benzoic acid in enough water to produce a 500 mL solution?

**Chemistry**

Commercial vinegar usually has a concentration of 5%, per volume. a) Calculate the [H3O+] , if the density of acetic acid is 1.051 g/mL. b) Calculate the pH.

**Chemistry**

Calculate the KA of formic acid if 2.3 g of it is dissolved in 1 litre of water to give [H+] of 0.003 M.

**Chemistry**

The equilibrium constant for the following reaction is 7.2 x 10-10. What is the [H+] in a solution 1.0 M of this acid? HCN + H2O --> H3O+ + CN-

**Chemistry**

200 g of CH3COOH are dissolved in enough water to make 1.5 L. What is the molarity of the acetic acid solution?

**Chemistry**

Which of the following contains the highest H3O+ ion concentration? Explain your answer. HCl 0.1 M HCH3CO2 0.1 M

**Chemistry**

a) What is the dissociation equation in an aqueous solution? b)Give the KA expression for each of the acids. Identify the acid-base pairs.

**Chemistry**

Are the reactants or the products favoured in the following reactions? a. CH3COOH with NH3? b. HS- with HCO3-? c. HNO2 with NH3 d. NH4+ with F- e. C6H5COOH with CH3COO- f. H2SO3 with HCO3- g. H2CO3 with SO32- h. H2SO3 with SO32-

**Chemistry**

Classify the following 3 acids in order of increasing acidity: Acid 1:Ka = 8 x 10-6
Acid 2:Ka = 6 x 10-4
Acid 3:Ka = 9 x 10-11

**Geometry**

1=d 2=c 3=b 4=d 5=a 6=c 7=d 8=b 9=c 10=c 11=a

**Geometry**

81.25$

**Math 3rd grade**

Fred needs to do quite a few errands. He needs to stop by the cleaners, the post office, the hardware store, and the bank. There are a number of ways he can tackle his list of stops. How many ways can he accomplish his tasks?

**geometry**

1=d 2=c 3=b 4=d 5=a 6=c 7=d 8=b 9=c 10=c 11=a

**business**

On December 31 of last year, Wolfson Corporation had in inventory 400 units of its products, which cost $21 per unit to produce. During January, the company produced 800 units at a cost of $24 per unit. Assuming that Wolfson Corporation sold 700 units in January, what was the ...

**business**

At the end of January, Mineral Labs had inventory of 725 units, which cost $10 per unit to produce. During February the company produced 650 units at a cost of $14 per unit. If the firm sold 1,000 units in February, what was the cost of goods sold? a. Assume LIFO inventory ...

**Earth/Space Science**

What is one way you can make a difference and decrease the impacts of soil erosion?

**astronomy**

Suppose that the gravitational time dilation on the surface of a star is 1.1. What would be the escape velocity from the star?

**astonomy**

If 100 asteriods, each of diameter of 100 km, were combined into a single object, approximately what would its diameter be?

**Algebra**

I have an input / output machine I need a rule I can use for any value, like 10 or 100 input 1, output 3 input 2, output 6 input 3, output 12 input 4m output 24

**Chemistry**

Hoe Many moles of each reactant are Needed to produce 3.60 x 10^2g CH3OH?

**7th grade math**

what elevacion a potencias y sus operciones inversas

**science**

_____ 3. You should indicate direction when reporting speed. TRUE OR FALSE

**English**

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**Math**

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**Pre-Algebra Math**

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**physics**

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**math**

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**English-please help!**

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**calculus**

wat is the ans of this solutions? y=sin^4x cos4x? ^

**Math**

A satellite in a circular orbit 879.4 mi above the earth makes one complete orbit every 83.42min. What is its linear velocity? Use 3963 mi for the length of the radius of the earth.

**Math**

How many different groups of 20 can you make from 40?

**Statistics**

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**trig**

The terminal side of θ lies on a given line in the specified quadrant. Find the values of the six trigonometric functions of θ by finding a point on the line. Line: (55/48)x Quadrant:III sin(θ)= cos(θ)= tan(θ)= csc(θ)= sec(θ)= cot(θ)=

**chemistry**

is the answer 1,663,558.4 J

**world history**

Why is increased interregional trade a factor that represents the most significant cause of growth of cities in Afro-Eurasia in the period 1000-1450?

**Physics**

a ball is released from rest and rolls down in an inclined plane, requiring 4 sec. to cover a certain distance of 100m. a) what is the acceleration? b) how many cm would it have fallen vertically in the same time?

**Physics**

a bomb is dropped from an airplane travelling horizontally with a speed of 300 mi/hr if the airplane is 10000ft. above the ground, how far from the target must it be released, neglect friction?

**Physics**

the speed of the train is reduce uniformly from 15m/s to 7m/s while travelling a distance of 90m. a) compute the acceleration b) how much further will the train travel before coming to rest provided the acceleration remain constant.