# Posts by allie

Total # Posts: 390

**ocher**

Estimate how many theoretical plates are needed to separate a mixture that has a mole fraction of B equal to 0.70 (70% B) in Figure 15.3.

*March 14, 2017*

**math**

The figures in (a) and (b) below are made up of semicircles and quarter circles; the figure in (c) shows a quarter of a circle in a square. Find the area and the perimeter of each figure in terms of ?.

*February 25, 2017*

**math**

Given: ?KLM, KL = LM = 13in, KM = 10in. Find: The area of ?KLM I got for the area 12?34 but its wrong :(

*February 25, 2017*

**math**

Justin is 3 years older then Sam, and Justin’s age in 2 years will be twice what Sam’s age was 3 years ago. Find their present ages. i got 14 and 17 but the answer is wrong

*February 19, 2017*

**math**

Richard is 6 years older than Lisa, and in 5 years the sum of their ages will be twice as much as the sum of their ages 4 years ago. Find their present ages.

*February 19, 2017*

**geometry**

for the area i got 36 (right?)

*February 17, 2017*

**geometry**

Given: ?AKL, AK = 9 m?K = 90o m?A = 60 ° Find: The perimeter of ?AKL The area of ?AKL for this one i got 81 for the perimeter side a 6 and side b is 12

*February 17, 2017*

**geometry**

so the answer is 6?

*February 17, 2017*

**geometry**

In ?ABC, m?ACB = 90°, and m?ACD = 45°. Find:AC, if CD =6?2 in. can u put answer and solution

*February 17, 2017*

**Geometry**

In the ?PQR, PQ = 39 in, PR = 17 in, and the altitude PN = 15 in. Find QR. can u guys show how to solve the problem(plz include answer) i got 42 by using the pythagorean theorem i am not sure if i am correct but can u check it

*February 17, 2017*

**Economicsquiz soon! HELP!!!...**

I don't get when to use the 7.65% and then the 1.45% How do you calculate the following below...given: number of hours worked-952 Hourly pay- $120.50 ______________________________ A. Gross pay for the year B. FICA Taxes C. Federal Income Tax D. Net Pay (A-B-C=_ ) right? ...

*February 15, 2017*

**Economics (help!) **

Isn't the gross pay for the year = number of hours worked (times*) hourly pay? ... If so, I get that part. I am not sure to do the others though...?

*February 13, 2017*

**Economics**

I don't get when to use the 7.65% and then the 1.45% How do you calculate the following below...given: number of hours worked-952 Hourly pay- $120.50 ______________________________ A. Gross pay for the year B. FICA Taxes C. Federal Income Tax D. Net Pay (A-B-C=_ ) right? ...

*February 13, 2017*

**physics**

if the weather channel guessed that it would rain, you would not believe them even if they have evidence of a thunder storm. My sister said that she assumed that the ball's speed would be the same going up and down so she gave "evidence" for why she thought the ...

*February 11, 2017*

**math**

Given: âˆ†ABC is isosceles mâˆ ACB = 120Â° mâˆ BMC = 60Â° CM = 12 Find: AB can you guys help I'm really struggling with proofs (statement and reasons)

*January 28, 2017*

**Chem**

If test tube 1: 2 grams KNO3 test tube 2: 4 grams KNO3 test tube 3: 6 grams KNO3 test tube 4: 8 grams KNO3 Why would test test tube #1 take longer to recrystallize?

*January 22, 2017*

**Math**

Mr.Rivas bought a can of paint.He used 3/8 of it to paint a bookshelf. He used 1/4 of it to paint a wagon. He used some of it to paint a birdhouse and has 1/8 of paint left. How much did he use for the birdhouse

*January 17, 2017*

**math**

I did it a vary different way and i meant 16, i think i pressed that wrong key and for the slower car i got 42 not sure how though but thanks for your help Steve!

*January 5, 2017*

**math**

Two trucks are traveling in the same direction, one going twice as fast as the other. At the end of 6 hours they are 204 miles apart. How fast is each travelling? Can you guys show me the answer i got 68 and 146 but its wrong

*January 5, 2017*

**math**

Solve the equation for x. For each of the following problems is it possible for x to be equal to: 1? (x+m)/(x?1)=1 If m ? -1, there are no solutions\ if m=1, the solution is ? Ii do not now how to find the solution for if m=1 but i got all real numbers, but my teacher says ...

*December 18, 2016*

**math**

sorry i just realized that i tied that under my sister's name :)

*December 9, 2016*

**math**

The width of a rectangle is equal to m cm, but its length is five times greater than the width. Find the area of the rectangle. is the answer m*5m=6m

*December 9, 2016*

**math**

1/225b^{(3m+10)} can you guys simplify this ^_^

*December 9, 2016*

**Physics**

You exert a force of 200 N at an angle of 15 degrees above horizontal to pull a 10 kg box across the floor at constant velocity. If the coefficient of kinetic friction between the box and the floor is 0.42, what is the acceleration of the box?

*December 8, 2016*

**Calculus**

Suppose that you are to make a rectangular box with a square base from two different materials. The material for the top and four sides of the box costs $1/ft2$1/ft2; the material for the base costs $2/ft2$2/ft2. Find the dimensions of the box of greatest possible volume if ...

*November 19, 2016*

**algebra 2**

Write a quadratic equation with roots 2 - 3i and 2 + 3i. I just need confirmation I did it correctly. I got y = x^2-4x+13

*November 17, 2016*

**math**

Mom has 2 apples and 3 bananas. Every morning for 5 days she is going to give her son an apple or a banana. What is the probability that the boy will get a banana at least two days in a row during these five days?

*November 12, 2016*

**math**

A student has passed 60 percent of the 20 quizzes he has written so far successfully. If the student writes 50 quizzes during the year, and passes 80 percent of the remaining quizzes successfully, what would his average percentile be? same with this one

*November 11, 2016*

**math**

i think it's right

*November 11, 2016*

**math**

The ratio of the number of Mimi’s Eminem cd’s to the number of Rita’s Eminem cd’s is 5:8. Rita has 18 more Eminem cd’s than Mimi. If Rita gives 22cd’s to Mimi, what will be the new ratio of the number of Mimi’s Eminem cd’s to Rita’s...

*November 11, 2016*

**math**

I got 14 and it wrong

*October 28, 2016*

**math**

I got 54.(4) but my teacher says its wrong

*October 28, 2016*

**math**

It takes 18 electricians 35 days to wire a new housing subdivision. How many days would 28 electricians require to do the same job?

*October 28, 2016*

**English**

"The Yellow Wallpaper" by Charlotte Perkins Gilman Can someone check to see if these are right? Much appreciated. I tried to include the quotes to make it a little easier. 1. The narrator's attitude towards the setting in lines 1-5 is best described as ? " ...

*October 27, 2016*

**Calculus**

Ship A is moving east at 20 miles per hour, while ship B is moving north at 15 miles per hour. At noon ship A was 5 miles east of an island, and ship B was 75 miles south of the island. At what rate is the distance of the ships changing at 1 pm?

*October 23, 2016*

**math**

the answer is neither

*October 21, 2016*

**math**

State whether the lines are parallel, perpendicular, or neither. Show your work.x–5y=103 and –2x=–206–10y i got neither is that right

*October 21, 2016*

**algebra**

Find the coordinates of the points of intersection of the graphs with coordinate axes:y=−1.5x+3

*October 12, 2016*

**algebra**

Find the coordinates of the points of intersection of the graph of y=13−x with the axes and compute the area of the right triangle formed by this line and coordinate axes. can u guys plz find answer + explain this problem is really hard and confusing 2 me

*October 12, 2016*

**Statistics**

Scores on an SAT test have a mean of μ = 1026 and a standard deviation of σ = 209. Compute the margin of error of the sample mean for a random sample of 100 students.

*October 9, 2016*

**Statistics**

The weight of luggage that a randomly selected airline passenger brings onto a flight has a mean of 35 lbs and a standard deviation of 6 lbs. If a flight has 80 passengers, within what range would the average weight of their luggage fall with 95% certainty?

*October 9, 2016*

**Chemistry**

What is the molar volume of pure water at 22 degrees Celsius?

*October 5, 2016*

**Is it possible if you guys can check my algebra HW**

can you check this one: green one has 9 more bushes of red currant than garden two. if 3 bushes from garden 2 were placed in garden 1 then garden 1 will have 1.5 times more bushes than garden two. how many bushes were in garden one i got no solutions x-9+3=x-3 0=3

*September 30, 2016*

**Is it possible if you guys can check my algebra HW**

-3x+2*(-x) x=0

*September 30, 2016*

**Is it possible if you guys can check my algebra HW**

two bags had 100 kilograms of sugar each. After taking out 3 times as much sugar from bag one than bag two , bag one had half as much sugar was bag two.How much sugar is left in each bag? i got 9 kilogram in bag on 1 and 0 grams in bag 2

*September 30, 2016*

**math**

thanks

*September 25, 2016*

**math**

i did am not really sure how u got that

*September 25, 2016*

**math**

Jammed is building a two story house in which the top floor is 12feet above the bottom floor the local building code specifies that the hight of a step cannot be above 7.5 inches what is the maximum height of a step in a staircase that jammed can construct between the floors ...

*September 25, 2016*

**math**

is 15 the correct answer

*September 25, 2016*

**math**

two sides of a triangle are 15cm and 18 cm in length. the altitude tossed is 10cm what is the length of the altitude to the 15 cm side?

*September 25, 2016*

**math**

Insert symbols from order of operations to make the statements true: 14 2 5 5 = 10 2 8 9 5 = 34 40 8 7 3 =32

*September 13, 2016*

**Social Studies (check my answers)**

'Yes' is right!!!! I just got 100%!

*August 15, 2016*

**Maths**

Given sec θ =(square root) 10 and tan θ = 3, determine the following, csc(90° − θ)

*July 9, 2016*

**Maths**

If sinθ = (square root) 3/2 , find the value of θ in degrees (0 < θ < 90°)

*July 9, 2016*

**English**

B is wrong. It is C

*May 19, 2016*

**Chemistry**

What is the pH of a solution prepared by mixing 50.0 mL of 0.010 mol/L HCl(aq) and 50.0 mL of 0.010 mol/L Ca(OH)2(aq)? Assume the temperature is 25 degrees Celsius. Additional information given: Kw = 1.0×10^−14 at 25 degrees Celsius. The possible answers are: A) 2....

*May 4, 2016*

**enlish part 1**

A Lincoln Preface is an example of what kind of writing?

*May 4, 2016*

**math**

and i was the one who did not show the work

*April 2, 2016*

**Chemistry**

0.012

*March 4, 2016*

**CHEMISTRY**

I'm showing the procedure of the lab and what was asked. What I have question on is towards the end. Much help would be appreciated a lot!! First I had to balance the equation given to me: 2 Na HCO3 (s) Δ over arrow (produces) Na2 CO3 (s) + CO2 (g) + H2O (g). From the...

*February 22, 2016*

**CHEMISTRYHELPP!! BOBPURSLEY**

I only did that ^ to get your attention. Thankyou for your help.. 2. so is it 2.9000 because technically that's wrong cuz theres 3 digits on the right of the period right? or is it 20.900 but that woudn't make sense. even if it was 02.900, the zero wouldn't matter...

*February 22, 2016*

**CHEMISTRY**

I'm showing the procedure of the lab and what was asked. What I have question on is towards the end. Much help would be appreciated a lot!! First I had to balance the equation given to me: 2 Na HCO3 (s) Δ over arrow (produces) Na2 CO3 (s) + CO2 (g) + H2O (g). From the...

*February 22, 2016*

**Chemistry**

1. Would it be advisable to determine the freezing point of pure p-dichlorobenzene with one thermometer and the freezing point of the solution with a different one? Explain. 2. If 0.150 mole of a nonvolatile non-electrolyte solute is present in 1200g of water, what are the ...

*February 19, 2016*

**English**

Why do u put like three stars in the end is the the answer

*January 28, 2016*

**Algebra 2**

Find the x and y intercepts for the following parabolas. y=(x+12)^2-144 y=(x-8)^-4

*December 15, 2015*

**math**

A.) write the rational expression as an equivalent expression whose denominator is the given polynomial. 1.) 6/7x^2y = ________/49x^3y^2 B.) perform the indicated operations, simplify if possible. 2.) x^2-3x-4/x^2-16 x x+4/3x-9

*December 6, 2015*

**Algebra**

A 6 m by 9 m swimming pool is surrounded by a deck which has a constant width. How wide is the deck if its area equals the area of the pool? I got 6*9=54 so for the deck xy=54 but I don't know where to go.

*December 3, 2015*

**Algebra**

Great Job Steve, I like that you didn't put only the answer. I needed help with the last one and you really helped.

*November 29, 2015*

**AP Chemistry**

Hey guys! I have answers, but am confused. Please and thanks for any help! A) Which of the following is false? 1.A spontaneous change occurs by itself without assistance. 2.The greater the statistical probability of a state, the greater is its entropy. 3.A non-spontaneous ...

*November 9, 2015*

**AP Chem (Conceptual Questions)**

Hey guys! If you could just please, look over a few of these conceptual problems because I'm pretty confused? (I put what I think is the answer below each question). Thank you for any help in advance!!!! A.Which statement *does not* apply to a heterogeneous catalyst? 1.It ...

*November 1, 2015*

**AP Chem**

Hey guys! I'm not really stuck on this problem, but I was wondering if someone could look it over to make sure that what I did makes sense. Thank you: 1) Balance this equation. What is the coefficient in front of I2? IO− + I− --> I2 in acidic solution Maybe ...

*October 25, 2015*

**AP Chemistry**

I'm so sorry to bother you guys again! Stuck on two other questions: 1. In the following equilibrium: NaCl(s) Na+(aq) + Cl–(aq), would adding more NaCl(s) increase the Cl-(aq) concentration? Explain why. My thoughts: I thought that it wouldn't increased the Cl- ...

*October 22, 2015*

**AP Chem (Thanks!)**

Hey guys! Stuck on some! My maybe answers are written next to the problem (1 problem-5 parts). Thanks for any help: 1. Lead (II) chromate, PbCrO4, is a slightly soluble salt. Write a net ionic equation for the dissolution of solid PbCrO4 in water. My thoughts: PbCrO4+2H+-->...

*October 22, 2015*

**CHEMISTRY!!!**

12.) If 4.75 * 10^23 atoms of silver are placed on one side of a platform balance, how many atoms of gold should be placed on the other side to balance this quantity of silver? Atoms to Atoms? How would I convert that. It's kind of live a division problem too but how to ...

*October 19, 2015*

**Chemistry**

12.) If 4.75 * 10^23 atoms of silver are placed on one side of a platform balance, how many atoms of gold should be placed on the other side to balance this quantity of silver? Atoms to Atoms? How would I convert that. It's kind of live a division problem too but how to ...

*October 19, 2015*

**chemistry**

1.) Here is what I did. 1.500 carat diamond (C) * (200.0 mg C/1 caret diamond C) * (1 g C/ 1,000 mg C) *( 1 mol C / 12.011 g C) * (6.022*10^23 atoms C/ 1 mol C) Sorry its confusing when you type it

*October 19, 2015*

**chemistry**

Here are my answers after I figured it out. Are these correct though? 1.) 1.50 *10^25 atoms C 2.) 5.173 *10^23 atoms Mg

*October 19, 2015*

**chemistry**

1.) How many carbon atoms are contained in a 1.500 carat diamond (carbon) if 1 caret =200.0 mg? _____________________________ I don't know if I'm doing this right but I tried. Can someone help? 1.500 carat diamond (C) *(200.0 mg/1 caret) ... ...

*October 19, 2015*

**AP Chem (Thank you for help)**

Thank you. I got 2 and 3, but I still don't understand how to balance the first one. Can you offer any help with that? Also, if you could, could you check my last problem? I'm sorry, and thank you!

*October 17, 2015*

**AP Chem (Thank you for help)**

Hey guys! Stuck on some Redox Reactions. I tried my best to put as much work as I could, but I'm super stuck on these ones. Thanks for any help: 1) Balance the equation as written, what is the coefficient for O2? NH4+ + O2-->NO2− + H2O (in basic solution) Maybe ...

*October 17, 2015*

**AP Chem**

Hey guys! Thanks for any help in advance! I'm back with this problem: Calculate the percent dissociation for a 1.00 × 10-6 M solution of HCN at 25 °C. Ka = 4.90 × 10-10. So my question really is do I have to use water when I calculate the percent ...

*October 12, 2015*

**math**

112.5 = 1x

*October 12, 2015*

**Accounting**

In its first month of operations, Giffin Company made three purchases of merchandise in the following sequence: (1) 260 units at $5, (2) 360 units at $7, and (3) 460 units at $8. Assuming there are 160 units on hand at the end of the period, compute the cost of the ending ...

*October 12, 2015*

**AP Chem**

Thanks for the help! Sorry about D; I've never experiences a problem like that before. I guess I have a question about D. I understand that k2 is a lot smaller than k1, but since you get a different answer when doing the second ionization doesn't that mean that it is ...

*October 10, 2015*

**AP Chem**

Hey guys! Stuck on some pH problems! Thanks so much in advanced: A) Calculate the pH of a 0.200 M solution of potassium acetate, KCH3CO2, in water at 25 °C. At this temperature, Ka = 1.76 × 10-5 for acetic acid. 1. 2.73 2. 5.45 3. 9.02 4. 9.94 5. 10.16 6. none of ...

*October 10, 2015*

**AP Chemistry**

Hey guys stuck again! Bromine and chlorine dissolve in carbon tetrachloride and react to form BrCl: Br2 + Cl2--> 2BrCl (in CCl4) Under equilibrium conditions [Br2] = [Cl2] = 0.00430 M and [BrCl] = 0.0114 M. The addition of 0.100 moles of Br2 to exactly one liter of this ...

*October 9, 2015*

**AP Chemistry**

Sorry! Here: ICE Table N2O N2 O2 .2M 0M 0M -2x 2x x .2-2x 2x x Kc=[N2]^2[O2]/[N2O]^2 3.5*10^-18=[2x]^2[x]/[.2-2x]^2 0=-4x^3+1.4*10^-17x^2 -2.8*10^-18+1.4*10^-19 I then graphed this cubic and my x was actually 3.3*10^-7 I plugged that x into 2x to get 6.6*10^-7, which is none ...

*October 8, 2015*

**AP Chemistry**

Hey guys! Stuck on another one: The reaction 2N2O(g) 2N2(g) + O2(g) has Kc = 3.5 × 10-18 at a particular temperature. If 0.20 mol of N2O is placed in a 1.00 liter container, what will be the N2 concentration when equilibrium is reached? 1. 4.4 × 10-9 mol/liter 4. 3...

*October 8, 2015*

**AP Chemistry**

That makes sense! Just wanted to say thanks!

*October 8, 2015*

**AP Chemistry**

Hey guys! Stuck on some problems: 1)Consider the following chemical reaction between gases: 2N2O(g) + O2(g)->4NO(g) + heat The amount of O2 at equilibrium will be decreased by: 1. Adding more NO(g). 2. Increasing the pressure by decreasing the volume. 3. Removing N2O. 4. ...

*October 8, 2015*

**AP Chemistry**

Hey guys! Thanks in advance for help! Confused on a question: If the rate=k[NO]^2[Br2], and the concentration of Br2 is doubled, what happens to the rate? Maybe Answer: Maybe the rate would increase by a factor of two?

*October 1, 2015*

**Advanced Placement Chemistry**

I just wanted to say thanks for all your help! I'm still thinking about what to do for seven, but you make a good point. Your way makes more sense than mine did! Thanks again! You're amazing!

*September 24, 2015*

**Advanced Placement Chemistry**

For 7, this my thinking: Molality of solution: 5.63 g CdBr2 / 272.2 g/mol = 0.0207 mol / 0.1 kg water = 0.207 m 0.54C = i (1.86) (0.207) i = 1.4 If CdBr2 was completely dissociated, i would be 3. If it was a non-electrolyte, i would = 1. So I guess that's why I think it is...

*September 24, 2015*

**Advanced Placement Chemistry**

I'm so sorry! I didn't even think of that, but I will do that next time! I don't understand number 1, does BF3 have a zero dipole moment? Do the others look okay? Thanks so much!!!

*September 24, 2015*

**Advanced Placement Chemistry**

Hey guys! Stuck on some review problems: (My maybe answers are at the end) 1)Which of the following molecules has a nonzero dipole moment? A. CO2 B. H2 C. C12 D. CH4 E. BF3 F. None of the above has a nonzero dipole moment 2) Which of the following would you predict to have the...

*September 24, 2015*

**AP Chemistry**

Hey guys! I'm stuck on some study guide problems... (On the bottom of this, I put what answers make sense to me) A) A factor that affects the speed of heterogeneous reactions but not of homogeneous reactions is 1)nature of reactants 2)concentration of reactants 3)area of ...

*September 23, 2015*

**AP Chemistry**

Hey guys! What is the rate constant is particularly sensitive to: 1 A change in volume 2 A change in pressure 3 A change in product concentration 4 A change in reactant concentration 5 A change in the activation energy I feel like it is a change in the activation energy b/c ...

*September 20, 2015*

**AP Chemistry**

Hey guys! I'm really lost on this equation. Any help? H2(g) yIelds 2H(g) Delta H = 436 kJ/mol F2(g) yields 2F(g) DeltaH = 158 kJ/mol H(g) + F(g) yields HF(g) &...

*September 19, 2015*

**physics**

In the (Figure 1) the coefficient of static friction between mass mA and the table is 0.42, whereas the coefficient of kinetic friction is 0.17. Ignore masses of the cord and the (frictionless) pulley. What minimum value of mA will keep the system from starting to move? What ...

*September 10, 2015*

**Chemistry**

Hi guys! I just learned about significant figures today, and I have a question about them. My teacher gave us a problem where all values have what I think is four significant figures (like 44.56) except the value for temperature (which is 25.5C). Are temperature values ...

*September 9, 2015*