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Posts by alice

Total # Posts: 727

Physics
Hello, I am wondering if someone can answer me this question: In an Atwood machine why do the tensions that handle both bodies are the same? (English is not my native language)

Math
A lemonade machine with a cash price of $4000.00 is purchased on an installment plan with a$460.00 down payment and 13 monthly payments of 272.31. What is the amount financed

Ms. Sue
O.o WHHHHAT?!!?!?!?

Ms. Sue
how old are you Ms. Sue?

Algebra Help please
Tom, Dick, and Harry are three brothers and have $107.60 together. Tom feels sorry for hairy because he has less money than Tom. So Tom gives harry $2.10 so they both will have the same amount after the transfer. Dick doesn't know about Tom's gift and he gives $1 to ...

Math
3 purple marbles. sorry

Math
A jar contains 5 blue marble, 8 red marbles, 4 white marbles,and purple marbles. Suppose you pick a marble at random without looking. Find the probability of each event. Choosing a blue marble, putting it back, then choosing a purple? (Simplest form)

Calculus Help Please
Hello! I am struggling with this problem: Find the Taylor Series for sin(x-2) centered at c=3. My work so far: sin(1)+(x-3)cos(1)-(1/2)(x-3)^2sin(1)-(1/6)(x-3)^3cos(1)+(1/24)(x-3)^4sin(1)... I know that the Taylor series for sign is typically: the summation from n=0 to ...

Pre-Algebra
Which equation models the linear relationship in the table below? x y -4 10 1 -5 6 -20

Pre-Algebra
Given a cylinder and a cone with the same base and the same height Cylinder: r=4 ft and h=3 ft Cone: r=4 ft and h=3 ft What is the volume of the cone in cubic feet? A. 12 ? B. 16 ? C. 36 ? D. 48 ?

Pre-Algebra
There are about 3x10^20 gallons of salt water on the earth, while there are about 6x10^18 gallons of fresh water. About how many times the amount of fresh water is the amount of salt water? A. 2 TIMES B. 50 TIMES C. 200 TIMES D. 500 TIMES

Pre-Algebra
Martha is in a hot air balloon that has risen straight up from the launch point. Matthew is standing on the ground, 16 meters away from the launch point. If Martha and Matthew are 20 meters apart, how high has the balloon risen? A. 4 meters B. 12 meters C. 36 meters D. 144 meters

Statistics
Suppose you are told that a 95% confidence interval for the average price of a gallon of regular gasoline in your state is from $2.85 to $3.84. Use the fact that the confidence interval for the mean is in the form x ? E to x + E to compute the sample mean and the maximal ...

calculus
Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.) (x^2?x+12)/(x^3+3x) dx

Calc
The figure (which is not pictured, sorry) shows the slope field for y =.2(9-y^2). Make a sketch of the solution using the initial value y(-4)=-2. Find the function f(x) that this solution curve is approaching as x-->infinity. I need help with finding the function f(x) that ...

Calc
The time interval T, in minutes, between patient arrivals in an emergency room is a random variable with exponential density function p(t) = 0:125e^-.125t. What is the average time between patient arrivals? What is the probability of two patients arriving within 3 min of each ...

calculus
Evaluate the integral. from 0 to ?/2 sin^3(?)cos^5(?) d?

Chemistry
I believe the second would increase solubility because it forms a complex, but I do not know the pH of copper (ii) carbonate. Because I think the pH would effect solubility

Chemistry
To clarify: the Ksp is not negative, it is 2.5 x 10^-10. the negative sign is unintentional

Chemistry
indicate whether the following would increase decrease or have no effect on the solubility of copper (ii) carbonate (ksp - 2.5 x 10^-10) when compared to the solubility of water 1. dissolve it in an acidic solution 2. dissolve it in ammonia, forming a complex 3. dissolve it in...

AP chem
Complete and Balance the following equation using the half-reaction method; (MnO4^-) + (CH3OH) --> (Mn^2+) + (HCO2H an explanation/step by step would be nice because i keep getting wrong answer from the H+ & H2O (they are both suppose to be 12 according to the answer key ...

Physics
A square-shaped loop carries current I. What is the magnitude and the direction of the magnetic field at point P, which is located on the bottom segment of the loop? Each side of the square loop has length d. The answer should be given in terms of d, I, pi, and the ...

Maths
The scale on a map is 1:200 000. Work out the number of kilometres represented by 2.5 cm on the map. I've never done a question like this before. If you can help I would be really grateful.

Calc
Use a comparison test to determine if the integral from 8 to infinity of sin^10(x)e^(-x) converges or diverges? I am stuck on what to use to compare. Any help is appreciated! Thank you! I was thinking -1<sin<1 but then I get 1<sin^10<1 which makes no sense

Math
The fruit plants in my garden do not bear fruit during their first summer. The fruits are picked for the next two years and then the plants become too woody and need to be pulled up. Occasionally some of the die over winter. The last five years I had fruit on the following ...

Math
The fruit plants in my garden do not bear fruit during their first summer. The fruits are picked for the next two years and then the plants become too woody and need to be pulled up. Occasionally some of the die over winter. The last five years I had fruit on the following ...

Math
Find the fifth term in the expansion of (4-1/5x)^9 in ascending powers of x

Aice Math
The binomial expansion of (5-x/2)^6 is 15625 + px+qx^2+... Find the value of "p" and the value of "q"

Math
In the expansion of (x^2-b/x)^4, the coefficient of x^2 is 294. Find the value of the constant "b"

Calc
The base of a solid is the unit circle x^2 + y^2 = 4, and its cross-sections perpendicular to the x-axis are rectangles of height 10. Find its volume. Here's my work: A for rectangle=lw A=10*sq(4-x) V= the integral from -4 to 4 of sq(4-x^2)*10dx But that gets me 0, so I ...

Algebra
This is the problem for arithmetic sequences and series: Moshe would like to get tickets for President Justin Bieber's inauguration. It will take him 20 years. He decides to pay $200 the first year and then increase his payment by $60 each year. a) How much did he pay in ...

Algebra
Moshe would like to get tickets for President inauguration. It will take him 20 years. He decides to pay $200 the first year and the increase his payment by $60 each year. a) How much did he pay in the last year? b) How much did he pay altogether for the tickets?

Algebra
Scholmo reads 7 pages of his book on the first day and his rate of reading then goes up by 3 pages each day. a) How many pages will he have read on the 8th day? b) After how many days will he have read more than 425 pages?

Algebra
The answers will be correct?

Algebra
Factor each: f(x)= x^3 + 7x^2 + 10x f(x)= 5x^3 -19x^2 - 4x

Math
Mary has a third of the money Erin has. Erin has $8 less than John. Together they have $267. How much money does each of them have?

Physics
Capacitor c1 and c2 are 4f and 2f respectively are charged as series combination across 100v battery. The two capacitors are disconnected from each other.They are connected +ve plate to +ve plate and -ve plate to -ve plate.calculate the resulting charge on each capacitor

math
four times a number plus three times the sum of a number and four is equal to negative nine

precalculus
Can you please check these answers. In exercises 10-13 , find (a)2v+u, (b)u-3v), and (c)5u-v. 10.u=<0,-4>, v=<-2,-8> a) 2v+u = <-4,-16) + <0,-4) = <-4, -20> b,u-3v =<0,-4>- <-6,-24> =<6,20> c) 5u - v = <0,-20> - <-2,-8) = <...

precalculus
Is this correct if not could you explain how to make it correct? find (a)2v+u, (b)u-3v), and (c)5u-v. u=i-j v=6i+9i a. 2v+u u=i-j, v=6i+9i =(12i+18j) + (i-j) =13i+ 17j b. u-3v (i-j)-(18i+27i) -17i - -26j c. 5u-v (5i-5j)-(30i+54j) -25i - -59j

Spanish Linguistics
Explique la ambigüedad y dibuje los diagramas correspondientes a cada posible interpretación de cada oración. 1.Juan trajo un mapa de Italia. 2.Un hombre alto golpeo a una mujer con un bolso.

Organic Chemistry 2
The typical % yield for the reduction of 9-fluorenone using NaBH4 to obtain 9-fluorenol is 80%. In my experiment I obtained 89 %. Can you explain the reasons why my yield is higher? Is it better to obtain a higher yield or a lower yield than the expected one?

Math
so 104 is correct?

Math
I got 104 feet by subtracting

Math
What is the distance between 86.25 to -17.75

math
I got -2 2/3

math
i got 16 2/3

math
Fishing hook G is let down 2 1/2 times its present depth. where is fishing hook G now? FISHING HOOK G = -6 2/3

math
Fishing hook E is dropped 2.5 times its present depth. where is fishing hook E now? NOTE: FISHING HOOK E is -7.1 is the answer -4.14 or -17.75

Math
9. A grocer wants to mix a type of spice which costs £22 per kilogram with another type which costs £12 per kilogram, to obtain 20 kilograms of mixture which will cost £15 per kilogram. What quantity of each spice must the grocer take?

English
I agree with writeacher

social studies
my teacher said any morals a person would have

social studies
Did Christopher Columbus's' efforts to gain power and wealth compromise his morals?

Spanish Linguistics
That's fine. I would appreciate any help because I am so frustrated and lost and I don't understand. I don't know if I should do a table like this: pierd perd indicativo-presente yo [pier-do] presente f nos f d [perd-emos] or a table like this: pierd perd [pier-do...

Spanish Linguistics
La distribución de los alomorfos de la raíz del verbo perder esta condicionada fonológicamente. ?En qué contexto fonológico ocurre cada uno de los alomorfos? Para responder...haga una lista de formas verbales, en dos columnas según el ...

biomechanics
A cyclist is coasting up a hill. At t=0, the cyclist has a velocity of 14.27 m/s. If the acceleration of the cyclist is constant at -1.67 m/s2, how long will it take the cyclist to come to a complete stop? If the peak of the hill is 40 m away from the cyclist at t=0, will she...

Psychology
A man has cheated on his wife and he feels very guilty, but soon he begins to make excuses, saying how his wife has nagged him for years. The defense mechanism that BEST explains his behavior is: A) rationalization B) denial C) regression D) projection I believe the answer may...

math
A four-cylinder engine has a bore of 90mm and a stroke of 100mm. The clearance volume of each cylinder is 0.065 L. Assuming compression starts at the bottom of the stroke, determine: (a) the capacity of the engine (b) the compression ratio of the engine

Calculus
Evaluate using tabular method: integral e^(2x)cos3xdx

algebra
Room carpet 120 ft wide & 1440 inches long at $2per sq yard. How much is

Chemistry
What are the equilibrium concentrations of all the solute species in a 0.95 M solution of hydrogen cyanide, HCN? The Ka value = 6.2 x 10^-10. (a) [H3O+], M; (b) [OH-], M; (c) [HCN], M; (d) What is the pH of the solution? For HCN So far i have calculated the concentration of ...

math
to determine whether a person has as thyroid deficiency, a radioactive iodine with a half-life of 8.2 days is injected into the bloodstream. a healthy thyroid is able to absorb all of the radioactivity. the amount, R, of radioactivity present after t days can be modeled by the...

social studies
what are three advantages of visiting the city-state of sparta (cultural activities, recreation, athletics, sports, architecture, and famous sites) What are 2 travel alerts that warn tourist some the dangers they might encounter while staying in sparta PS: This is ancient sparta

Math
A banner is shaped like a parrelelogram. The banner has a base length of 3.25 meters and an area of 4.55 square meters. Explain how to find the height of the banner

Social studies
What are 3 advantages of visiting the city state of Sparta What are 2 travel alerts in Sparta (in ancient times)

Chemistry
How do you transform an alcohol into an alkene? The example I need help with is: What are the reagents to transform 1,2-dimethyl-propanol to 4,5-dimethyl-2-hexene? This must be done in two steps.

Chemistry
What are the possible reagents needs to transform 1-butene to 2-butene? This can be done in two steps.

Math
I'm a fraction that is equivalent to 1/2 my sum of numerador and denominator is 15 what fraction I'm?

macroeconomics
11 - 7. (Fiscal Policy) Increased government purchases, with taxes held constant, can eliminate a recessionary gap. How could a tax cut achieve the same result?

Calculus
The Riemann sum s for f(x)=4x^2, 0<=x<=1, taking the sample points to be the right endpoints is given by s=4n^2+6n+2/3n^2. True or False?

Calculus (Urgent, please)
Find the area of the region enclosed by the intersection of the circle x^2+y^2=4 and the parabola y=x^2. Show work

Calculus
Use the function f to solve the following: a) Local minima, local maxima, and stationary points if any. Show work. b)Intervals of upward concavity and downward concavity if any. Show work. c) Inflection points if any. Show work. f(x)=2x+1/x-2 Please, don't do steps for ...

Chemistry
Or would it be q system = - (q water + q calorimeter) ????

Chemistry
We're doing a spontentaity lab in chemistry and I wanted to make sure I was using the right equation to do the questions! Could someone make sure this is right?? q system = - (q water - q calorimeter)

Equilibrium Consentration
At a certain temperature, the reaction H2(g)+ Cl(g)=2HCl(g)has Kc = 5 x 10^8. If a reaction mixture at equilibrium contains 0.48 M of H2 and 0.23 M of Cl2, what is the concentration of HCl? I was wondering if I had to rearrange the equilibrium constant equation to work out the...

Calculus
Determine whether the hypotheses of the Intermediate-Value Theorem are satisfied. f(x)=x^1/3 , [a,b]=[-1,1] Please, explain. Thank you.

electronics
how to compute charging and discharging time of capacitor in voltage to frequency converters.

Chemistry
How many grams of ammonia (NH3) will be produced when 0.281 grams of nitrogen are combined with hydrogen?

C programming
1.write a C program to reverse the elements of array using recursive function(without using for and while loop). 2. write a C program to check the occurrence of an element in array using recursive function(without using for and while loop)

coding
1.write a C program to reverse the elements of array using recursive function(without using for and while loop). 2. write a C program to check the occurrence of an element in array using recursive function(without using for and while loop).

Climate Physics
Find the insolation in Wm^-2 at summer solstice for a low obliquity of 22 degrees? I used the following: h_0=cos^-1(-tan(phi)* tan(delta)) cos(theta)=[sin(phi)*sin(delta)+cos(phi)*cos(delta)*cos(h_0)] Result was 397 Wm^-2 This looked like an easy problem, but I am having ...

Science
Yes you are correct!

electronics
Full Wave Rectifier With Zener Regulator : what is the maximum load current the zener regulator can supply? given that Iz(min)=5mA(current through zener diode) and the maximum power dissipation in the zener is (1/2)W.

electronics
1. if the peak amplitudes of waves in case of full wave rectifier are not equal, what could be the reason? 2. in case of full wave rectifier with zener diode why does poor regulation of some I(current through the load resistance) occur?

Earth science
Shygirl and Ms. Sue are correct...

maths
Let (xk) ⊂ Rn and x ∈ Rn: Show that xk → x in Rn if and only if for every y ∈ Rn the sequence (⟨xk; y⟩) ⊂ R converges to ⟨x; y⟩, that is, ⟨xk; y⟩ → ⟨x; y⟩ in R.

Math HELP PLZZ!!
thanks

programming
write a C function which takes a natural number as argument and calculates the product of sum of its digits. A sum-product number is natural number that equals the product of sum of its digits and the product of digits.

programming
write a C function which takes natural number nas argument and calculate the sum of the digits raised to the power of the number of digits in n.

Math
A girl has $3.35 in her pocket, consisting of dimes and quarters. If there are 23 coins in all, how many of each does she have?

biology
1.Why do Bacteria and yeast synthesize fatty acids with more cis-double bonds when surrounding temperature drops? 2.Despite fluidity of bilayer, why do liposomes not fuse spontaneously with one another?

english
Which phrase is italicized?

Chemistry
Okay so, the average k-value(temperature) for a group of heavy gas species is 6.78 and the average k-value for a group of light gas species is 6.17 Then there's that question.

Chemistry
How does the molecular wight of the gas affect the k-value?

Calculus
(3) Suppose that f : R2 → R is a continuous function at x0 ∈ R2 and that |f(x0)| > 2. Show that there is a $ > 0 such that |f(x)| > 2 whenever ||x − x0|| < $.

Biology/Chemistry
Does anybody know how much 1 mole of acid should be diluted in order to mimic the pH of acid rain? I also need sources, but haven't been successful in any of my searches so far, thanks.

Algebra
the correct answer is 20 miles per hour. I just answered 40 and it counted it wrong and said it was 20. Good luck

Social Studies and Science
Why is water warmer in colder weather than in warmer weather? Thanks!

Math
Megan completes most puzzles in 24 minutes. Hassan completes most puzzles in 16 minutes. If Megan and Hassan complete a puzzle together, how long will it take?

Physics
A gardener waters a lawn. the hose ejects 5*10^-4 m^3 of water per second. The area of the mouth of the hose is 5 cm^2. Find the backward force exerted on the gardener.[density of water=10^3kg/m^3]

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