# Posts by DeeDee

Total # Posts: 124

**Analytical Chemistry**

I'm really sorry, but I still don't understand how all the amounts relate to each other, and I am about at my wits end. I'm not very good at math, but I am normally pretty good at chemistry and problem solving, and I don't know why I still don't get this. ...

**Analytical Chemistry**

Could someone show me step by step how to solve this type of problem? I have to do several of them, and would love to understand what is actually happening! Thank you so much in advance, I appreciate your help and time! Calculate the weight percent of ascorbic acid in a tablet...

**Calculus I**

Hello! I am not sure why I am getting this problem wrong, and I keep getting six. Could someone be kind enough to show me how it's done? Thank you very much in advance! Find the limit. Use l'Hospital's Rule if appropriate. lim ((5x − 2)/(5x + 4))^(5x + 1) x&#...

**Calculus I**

That was so helpful!! I appreciate you writing all that out, thank you very much!

**Calculus I**

Hello! I am taking Calculus I and am in Sec. 4.3 of Stewart's 7th Edition. I ran across a problem that I don't understand the mechanics of, could someone show me? Thanks a bunch! For what values of the numbers a and b does the function f(x)= axe^{b(x^2)} have the ...

**Calc I**

I'm a little confused about this one, it seems different from the rest of our homework! Could someone give me some hints? Thank you! Find the first and second derivative of the function. Check to see that your answers are reasonable by comparing the graphs of f, f ', ...

**Calculus**

I've been having a hard time with these lately... could someone explain it to me? Find f '(a). f(x) = (3x^2 − 3x + 4)

**Calculus, Limits**

Thank you! That was a huge help!

**Calculus, Limits**

Find the limit. lim t → ∞ (sqrt t + t^2)/(6t − t^2)

**Trigonometry**

Oh, I see now! That's exactly what happened!! Thank you, that's perfect!!

**Trigonometry**

If Hello, I have been working on this one problem for a while now and my professor is on vacation. Could someone give me a point in the right direction? Question: If sin x = 2/3 and sec y = 5/3, where x and y lie between 0 and π/2, evaluate sin(x + y). My answer was: (3+...

**Trigonometry**

A triangle has two angles, one 90 degrees, the other (between adjacent and hypotamuse) 26 degrees, and a hypotamuse of 10ft. Find the opposite side's length. Hint: use sine. I think I'm supposed to do 10(sine26), but the answer isn't right. What am I missing? Thanks!

**CHEMISTRY**

According to the equation H2SO4+2NH3 @(NH4)2SO4. What mass of ammonium sulfate will result from the reaction of 5.00 g of NH3?

**Math**

This does not explain how to come up with the right answer for me. I have worked it out several times and come up with the same answers, which I posted above. Can someone work this out so I can see what I have done wrong and can learn from my mistakes...

**Math**

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) (my answer was 100.9...

**Math**

A single die is rolled. (a) What is the probability that the number on top is a 3. (Give your answer correct to two decimal places.) (b) What is the probability that the number on top is an odd number. (Give your answer correct to two decimal places.) (c) What is the ...

**math**

A and B are events defined on a sample space, with the given probabilities. Find P(A and B). (Give your answer correct to two decimal places.) P(A | B) = 0.43 and P(B) = 0.75

**math**

Three hundred twelve viewers were asked if they were satisfied with TV coverage of a recent disaster. Gender Female Male Satisfied 90 53 Not Satisfied 124 45 (a) Find P(satisfied). (Give your answer correct to two decimal places.) (b) Find P(satisfied | female). (Give your ...

**Math**

A single die is rolled. (a) What is the probability that the number on top is a 3. (Give your answer correct to two decimal places.) (b) What is the probability that the number on top is an odd number. (Give your answer correct to two decimal places.) (c) What is the ...

**statistics**

A and B are events defined on a sample space, with the following probabilities. Find P(A and B). (Give your answer correct to two decimal places.) P(A) = 0.5 and P(B | A) = 0.4

**statistics**

These data were generated using the equation y = 2x + 1. A scatter diagram of the data results in five points that fall perfectly on a straight line. x 0 1 2 3 4 y 1 3 5 7 9 (a) Find the correlation coefficient.

**Chemistry**

Calculate the [H3O+] and pH of each polyprotic acid solution. (b) 0.116 M H3C6H5O7 I did part (a) just fine, but for some reason can't figure (b) out. Can someone help me with just the [H3O+] part to get me started? I already got 9.3e-3 and 1.4e-3 without success and only ...

**chemistry 2 college**

explain how to find the mass of solute in the solution: 50.0g of solvent in a 10.0% NaCl solution?

**Stats**

The area between the mean and a Z score of +1.50 is 43.32%. This score is higher than ___ of the score in the distribution.

**Chemistry**

My Chem professor is out for the weekend and I'm confused about what the question is asking or the equations needed... A 10.0-g block of pure nickel (Cp = 0.445 J/g-°C) is brought to each of the temperatures below. A sealed beaker containing 15.0 g water at the ...

**chemistry**

Ah, yes it does! Here are the three complete: (a) 2 H2S(g) + 3 O2(g) -> 2 H2O(l) + 2 SO2(g) [2(-285.8)+2(-296.8)] - [2(-20.6)] = (-571.6 + -593.6) - (-41.2) = -1124 (-1124.0?) (b) N2O4(g) + 4 H2(g) -> N2(g) + 4 H2O(g) [4(-285.8)] - [1(11.1)]= -1154.3 (c) SO2(g) + 1/2 O2(...

**chemistry**

I noticed that right after I wrote you, and typed in -1154.3 thinking I had solved it, but the program rejected it. I don't know any other possible answer. I did the equations the same way for all three reactions, and the third one was counted correct while the others are ...

**chemistry**

I saw, and it was SO helpful! Thank you!! Okay, here is how I did (b): (4)x(-285.8) - (1)(11.1)=-1150

**chemistry**

Use standard enthalpies of formation to calculate ΔHrxn° for each reaction. (See the appendix. Enter your answer to the tenth place.) (a) 2 H2S(g) + 3 O2(g) 2 H2O(l) + 2 SO2(g) (b) N2O4(g) + 4 H2(g) N2(g) + 4 H2O(g) (c) SO2(g) + 1/2 O2(g) SO3(g) These are so easy, but...

**chemistry**

Would the answer be 27kJ?

**chemistry**

NH4NO3(s) NH4+(aq) + NO3−(aq) In order to measure the enthalpy change for this reaction above, 1.07 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. The initial temperature is 25.8°C and the final temperature (after the solid dissolves) is 22.4&...

**english 125**

identify at least one major similarity and one major difference between the forms of the short story and the poem.

**eth 125**

Throughout most of U.S.history in most locations, what race has been the majority? What is the common background of most members of this group?

**physics**

Under what conditions can you use the formula W=Fnetd to calculate the work done on an object? Describe 2 requirements. What conditions would an applied force increase and decrese the energy of any object.

**business managment**

here are the correct answers: 1.C 2.B 3.A 4.D 5.B 6.D 7.C 8.A 9.B 10.D 11.A 12.B 13.C 14.B 15.A 16.C 17.B 18.A 19.C 20.A 21.C 22.D 23.A 24.C 25.D

**solution**

how much oxygen would be found in 10.0gal of water at 20c

**health administration**

What federal agency produces a report projecting healthcare expenditures for the coming decade?

**Health administration**

Health systems can be formed through which of the following mechanisms Ownership Not-for-profits For-profits Mergers

**algebra**

how do you subtract 7.9 from 21

**math**

How do you find out what percent one number is of another?

**public speeking**

Also what about game show contestants? They have to get up in front of others and either answere questions or do some sort of stunt. That can not be too nervous b/c they might mess up

**public speeking**

What might be some modern examples of speech styles that weren't discussed in the lecture? Defend why you consider these to be modern styles. In the lecture-new channels of speaking that have developed as a result of changes in technology. New forms of communication, such ...

**public speaking**

What are some moderen examples of speech styles?

**business math**

carol miller went to europe and forgot to pay her $740 mortgage payment on her new hampshire house. for her 59 days overdue on her payment, the bank charged her a penalty of $15 (assume 360 days) what was the rate of interest charged by the bank?

**physical science**

As the number of carbon atoms in the compound increases, what pattern do you see in the boiling points? What general pattern do you see in the melting points?

**physics**

A bomber flies horizontally with a speed of 235 m/s relative to the ground. The altitude of the bomber is 3570 m and the terrain is level. Neglect the effects of air resistance. The acceleration of gravity is 9.8 m/s2 . a) How far from the point vertically un- der the point of...

**Healthcare**

What current issues affect positive communication in health care organizations today?

**Healthcare**

What current issues affect positive communication in health care organizations today?

**Healthcare**

What current issues affect positive communication in health care organizations today?

**SOCIAL STUDIES**

AFTER THE REVOLUTIONARY WAR,WHAT HAPPENED TO THE COLONISTS

**statistics**

in certain manufacturing processes parts must be machined tonwithin specified tolerences. the parts must have a mean length of of six inches plus or minus 0.26 inches .A SAMPLING PROCEDURE HAS BEEN ESTABLISHED to determine wether the ten parts are within the specified ...

**math**

Solve. x+1/3 + x+2/7 =2

**psych**

Create a Microsoft? PowerPoint? presentation which briefly summarizes how psychological disorders are classified including the role of the DSM IV. The presentation must have at least one slide for each of the major classes of psychological disorders.

**m**

Solve for d C=9d answer: d= -C+9

**math**

Thank you

**math**

Solve by multiplication principle -2x is greater than 1/9 answer: x is greater than -1/18

**math**

So the slope would be all numbers? Or is it just undefined? I have to give exact numbers.

**math**

x=-2 does not have a slope does it?

**math**

So I come out with s=169/45 right? Then I substitute that into one of the equations to get r correct?

**math**

Solve using elimination method 2. 2r-7s=-31 7r+2s=24 answer: (230/53,-468/53) This is one of the elimination problems that i cannot figure out

**math**

is this correct? find the slope (1,6) (-6,-5) -5-6 -6-1=11/7

**math**

Thank you Damon! Can you help me with the formula to solve by elimination?

**math**

Can someone please check my work? Solve using substitution method 1. 3x+2y=12 x=52-6y answer:-40.8 I am pretty sure that one is wrong. Solve using elimination method 2. 2r-7s=-31 7r+2s=24 answer: (230/53,-468/53) 3.3x+4y=3 6x+8y=6 answer: No answer. problems eliminate eachother

**math**

Could someone please check these for me? 1. Find the function value if x=2 f(x)=x^3 F(2)=8

**math**

The table lists data regarding the average salaries of several professional athletes in the years 1991 and 2001. year average salary 1991 $263,000 2001 $1,430,000 a)Use the data points to find a linear function that fits the data. b) Use the function to predict the average ...

**algebra**

So that would be undefined?

**algebra**

find the slope of (-4,-4) (3,-4) I came out with 0/2 so how would i type the answer

**algebra- Please help**

10)The formula b=30a is used in New England to estimate the minimum furnace output, b, in BTU's for a modern house with a square feet of flooring. A) determine the minimum furnace output for a 2100 ft squared modern house. B) solve formula for a Answer:a) 630,000 b) unsure...

**Algebra 1**

7)use cummutative law to find and equivalent expression 73+yz answer: I don't even know where to start with this one

**Algebra 1**

10)The formula b=30a is used in New England to estimate the minimum furnace output, b, in BTU's for a modern house with a square feet of flooring. A) determine the minimum furnace output for a 2100 ft squared modern house. B) solve formula for a Answer:a) 630,000 b) unsure...

**Algebra 1**

Thank You! I am only having problems with 9 more questions. 2)find -x when x=-92/29 Answer: 92/29 7)use cummutative law to find and equivalent expression 73+yz answer: I don't even know where to start with this one

**Algebra 1**

17) Simplify [32/-8]/-1/2 Answer: -8 18) Add -7+(-9) Answer: -16 19)Solve 7(3x -2)=28 Answer:x=2 20)Solve using the addition principle 6.4=x-3.7 Answer:x=10.1

**algebra**

Thank you

**algebra**

find -x when x -92/29 wouldn't this be 92/29

**Algebra 1**

11) Tell which real number corresponds to the situation. During a quiz, a person loses 1800 pts. answer: -1800 12) Solve for y z=yq Answer: z-q=y 13) Solve using the multiplication principle 10x=-90 Answer: x= -9 14) Collect like terms 20w+w+14/19w Answer: 413w 16) A mountain ...

**Algebra 1**

7) Use cummutative law to find an equivalent expression. 73+yz Answer: 73(y+z) I know this one is wrong but I cannot figure out how to do the problem. 8) Simplify 6[5-9(3-1] Answer: -70 10)The formula b=30a is used in New England to estimate the minimum furnace output, b, in ...

**Algebra 1**

Thank you very much

**Algebra 1**

Can someone please check my answers? Thank You 1) Find an equivalent expression without parenthesis -(y+87) Answer: -y-87 3) Solve -3x-13x=96 answer: x= -6 4) Find the decimal notation 14/25 Answer: .56 5) Divide if possible 7/0 Answer:0 6) Solve 7x+10=52 Answer: x=6

**math**

find -x when x -92/29 wouldn't this be 92/29

**math**

a diver dives to 84m. If the diver rises 5 meters per min for 10 min. Where is the diver in relation to the surface. The answer would be 34 meters right?

**math**

I do not even know where to start with this one, can someone help? the peak of a mountain is 19,340 ft above sea level. what is the integer that best expresses the given number?

**math**

Thank you

**math**

find the best buy on cashews a.12oz for $5.39 b.1lb4oz for $7.39 c.10oz for $4.89 d.1lb for $6.39 B)Is this correct

**math**

I am sorry It is 8gal 7qt minus 3gal 2 qt

**math**

well it equals 5gal 5 quarts There are 4 quarts in a gallon so that translates to 6 gal 1 qt right? it was a multiple choice question a 5gal 2 qt b 5gal 3qt c6gal 3 qt d 6 gal 1qt D is the only locical answer right?

**math**

8gal 7qt minus 5gal 2qt= 6gal 1qt Is this right

**economics**

I am writing a paper on the technology industry. Can anyone guide me to some good sites to find information on the following: 1.shifts and price elasticity of supply and demand 2.positive and negative externalities 3.wage inequality 4.monetary and fiscal policies The problem I...

**math**

5.is 3.671 less than 3.67 yes 6.A triangle has a base of 13 feet and an altitude of 7 feet. Find its area. 45.5 7.find the best buy on cashews a.12oz for $5.39 b.1lb4oz for $7.39 c.10oz for $4.89 d.1lb for $6.39 A. 12oz for $5.39 8.8gal7qt+3gal2qt= 6gal1qt

**math**

4. If 1 gallon of water weighs 8.34lbs, how much does 3.75 gallons weigh? 31.275lbs

**Math**

Could someone check over these for me? Thank you soooooooo much! 1.Maria earns $14/hr. Last week she worked 7 hour days for 4 days. What was her gross pay? $392 2.Arrange the given fractions from smallest to largest. 3/10,1/9,1/12 1/12,3/10,1/9 3.write the following as a ...

**math**

Thank you I am having a hard time with this class

**math**

Turner agrees to buy a boat for $2,800 down and $129 a month for 48 months. What is the total cost of the boat? $8,992 This would be 129x48=6192+2800=8992 Right?

**math**

Someone please check my answers 1.In the number 854,263,189 what number tells the number of millions. 4 2.Write 4x4x4x4x4 as a power of 4 4^5 3.write 684 in expanded form 600+80+4 4.Turner agrees to buy a boat for $2,800 down and $129 a month for 48 months. What is the total ...

**math**

14/18- (-13/18)=27/18=3/2 or 1 1/2 is that right?

**math**

thank you

**math**

7/9 - (-13/18)=

**math**

-21-(-21)= would this be 0 or 42

**math**

find the reciprocal of (-1/5)(15)=

**math**

Thank you very much!

**math**

ok I have -21-(-9)=-12 wouldn't -21-(-21)=0