Sunday
August 28, 2016

Posts by Sarah

Total # Posts: 5,493

PHYSICS
JOHN WANTS TO PADDLE HIS CANOE ACROSS A RIVER THAT IS 200M WIDE, HE STARTS FROM THE EAST SIDE. THE WATER CURRENT FLOWS NORTH-SOUTH AT 0.5MS^-1. IT TAKES JOHN 252S TO CROSS THE RIVER. 1. DRAW A DIAGRAM TO GRAPHICALLY REPRESENT THE VELOCTY VECTORS OF THE WATER CANOE AND THEIR ...
August 28, 2016

Algebra 1
1. 4f (5)+7 2. F(X)=2x-6 3. g(X)= x^2-x-x-9 4. h(x)=4-X
August 27, 2016

biology
Which organelle(s) are likely to be involved in the reduced efficiency of amino acid recycling in wimpys liver cells?
August 25, 2016

PHYSICS
A bucket containing cement has a mass of 3kg. One end of a rope is attached to the handle of the bucket and the other end is wound around a horizontally mounted cylinder on frictionless bearings. The mass of cylinder is 6kg and its radius is 0.10m. The moment of inertia of the...
August 24, 2016

math
90%
August 22, 2016

Math
Where would I put parentheses in this problem to make it correct: 8+4x2+7divided by3=20
August 15, 2016

algebra
You want to celebrate all of your recent successes. You decide to reward yourself and a special someone with a vacation to a destination of your choosing. For your trip you will need to stay in a hotel/resort and rent a car. You decide to rent a car for the duration of your ...
August 13, 2016

Biochemistry
Calculate the mass (in g) of solid potassium hydroxide required to prepare: a) 1.75 litres of a solution with pH 11.5
August 3, 2016

Chemistry
Thanks DrBob222!
July 29, 2016

Chemistry
Could you please help me answer this question....
July 29, 2016

Chemistry
What are 2 allotropes of carbon? Could you please compare the physical and chemical properties....
July 29, 2016

Chemistry
Thanks!
July 29, 2016

Algebra
Write the equation of a line that contains (-8,4) and the midpoint of the segment connecting (-10,5) and (-5,0) in standard form. I'm not sure what I'm doing wrong. I found the midpoint (-7.5, -3.5), found the slope, and put the equation in standard form. I got x + y...
July 27, 2016

maths
simplify 6x+4y*-3x+5x-2x*3y
July 24, 2016

Calculus
Evaluate the definite Integral Integral [0 to pi/4] cos(2x)sec^2(pi/4 sin(2x))dx
July 7, 2016

Calculus
use te fundamental theorem of calculus to evaluate the integral Integral [0, pi/3] sin^2(x)dx I'm confused on what F(x) should be
July 7, 2016

Chem
Thank you Just one more question Why is it (63.55/2) g Cu ?
July 5, 2016

Chem
Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-)
July 5, 2016

chem
(sorry - accidentally posted it as physics problem) Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' ...
July 5, 2016

Physics
Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-) Please and thank you!!
July 5, 2016

Probability and statistic
Suppose X has an exponential distribution with mean equal to 13. Determine the following: (a) Upper P left-parenthesis x ⁢ greater-than 10 right-parenthesis (Round your answer to 3 decimal places.) (b) Upper P left-parenthesis x ⁢ greater-than 20 right-parenthesis...
July 1, 2016

probability and statistic
Suppose that the number of asbestos particles in a sample of 1 squared centimeter of dust is a Poisson random variable with a mean of 1000. What is the probability that 10 squared centimeters of dust contains more than 10090 particles? Round your answer to 3 decimal places.
July 1, 2016

Calculus
Yeah That's where I was confused.Probably. Thank you!
June 30, 2016

Calculus
Okay thanks! I have drawn my graph like that!
June 30, 2016

Calculus
Wait the Points are (-1,0) (0,0) and (1,0). Im confused since the critical points and these points are both at x=-1, x=1
June 30, 2016

Calculus
Yes, I was confused why x=-1 and x=1 had two different points. Maybe it's a typo?
June 30, 2016

Calculus
Sketch the graph of the function that has the following properties. f is continuous on (-infinity, infinity). points: (-1,2), (0, 0), (-1,0) f'(x)>0 at (-infinity, -1) f'(-1)=0 f'(x)<0 at (-1, 1) f'(1)=0 f'(x)>0 on (1, infinity) f"(x)<0 on...
June 30, 2016

Calculus
A printed page is to have 1.5 inches margin on all sides. The page should contain 144 square inches of type. What dimension of the page will minimize the area while still meeting these other requirements?
June 29, 2016

calc
Find the volume of the solid generated by revolving the region bounded by y=e^(5/2x),y=0,x=1, and x=5 about the x-axis.
June 29, 2016

calc
Find the volume of the solid generated by revolving the given region in the 1st quadrant about the y-axis: y=10x^2,x=0,y=810.
June 29, 2016

calculus
Find the volume generated by revolving about the x-axis the region bounded by the following curves y=sqrt/(4x+3),x=0,x=4, and y=0. (Use "pi" for π).
June 29, 2016

CALC
Find the volume of the solid obtained by revolving the region bounded by y=(19/3)x-(19/3)x^2 and the x-axis around the x-axis. Keep answer in terms of pi PLease explain each step
June 29, 2016

Probability and statistic
The time until recharge for a battery in a laptop computer under common conditions is normally distributed with mean of 270 minutes and a standard deviation of 50 minutes. a) What is the probability that a battery lasts more than four hours? Entry field with incorrect answer (...
June 27, 2016

CALC
my equation was y=900+C/e^(1/150)t
June 26, 2016

CALC
A 200-gallon tank is currently half full of water that contains 50 pounds of salt. A solution containing 1 pounds of salt per gallon enters the tank at a rate of 6 gallons per minute, and the well-stirred mixture is withdrawn from the tank at a rate of 6 gallons per minute. ...
June 26, 2016

Probability and statistics
Astronomers treat the number of stars in a given volume of space as a Poisson random variable. The density in the Milky Way Galaxy in the vicinity of our solar system is 1 star per 16 cubic light years. (a) What is the probability of 3 or more stars in 16 cubic light years? (b...
June 23, 2016

probability and statistic
Heart failure is due to either natural occurrences (85%) or outside factors (15%). Outside factors are related to induced substances or foreign objects. Natural occurrences are caused by arterial blockage, disease, and infection. Assume that causes of heart failure between ...
June 23, 2016

math
If you will triple the three it is called thrice but when you four what is it
June 22, 2016

Chemistry
Is NH4+ polar or non polar?
June 21, 2016

chemistry
Is NH4+ po;ar or non polar?
June 21, 2016

CALC
the exponent is (y-x^2)
June 21, 2016

CALC
Find the particular solution of the given differential equation dydx=−4xe(y−x^2);y=11whenx=1. THanks
June 21, 2016

CALCULUS
Yes but I'm not sure what the m>0 is for
June 20, 2016

CALCULUS
Let y(t) denote the mass of a radioactive substance at time t.t. Suppose this substance obeys the equation y′(t)=−14y(t). Assume that, initially, the mass of the substance is y(0)=M>0. At what time does half of the mass remain? (Round your answer to 3 decimal ...
June 20, 2016

CALC PLEASE HELP
Suppose that y′=ky, y(0)=7, and y′(0)=4. What is y as a function of t ? PLEASE EXPLAIN
June 20, 2016

CALCULUS
∫4x^−1*sin(ln(6x))dx I got 4*[-cos(ln(6x))]+C but its wrong and im not sure why... Please Help!! Thanks
June 16, 2016

CALC
Find the area of the region bounded by: y=2x−tan0.18x, x=1, x=5, y=0 Round your answer to 3 decimal places. I get 9 but its wrong! please help
June 16, 2016

Calculus
to make it continuous f(2)=a so it would equal -1?
June 16, 2016

Calculus
So a=-1 That makes sense because it's continuous
June 16, 2016

Calculus
find the value of a, if it exists, such that the following function is continuous at X = 2. piecewise function f(x)={x^2-3x+1, if x>2; a, if x=2; 3-2x, if x<2 I found the limits from left and right of 2 = -1 so the limit exists but I don't know how to figure out a
June 16, 2016

Math
Among a group of people, 10% are from NYC and 90% are not. All people from NYC are under 18 years old, and 70% of those not from NYC are also under 18 years old. One person is chosen at random, and he or she is under 18. What is the probability that the person chosen is from ...
June 15, 2016

CALCULUS
Find the derivative of y=4sinx−2cosx
June 15, 2016

Business Math
How long will it take for an investment to double at 7% p.a compounded monthly?
June 14, 2016

Calc
Find the derivative of y=4sinx−2cosx
June 13, 2016

Calculus
let f(x)=2x-7. Use the rigorous definition of limit to show that lim x-->4 f(x)=1
June 13, 2016

English
Can you summarize this case study 300 words minimum? Overview Hospital A: Porter Regional Medical Center (PRMC) Located on the east side of town, Porter Regional Medical Center (PRMC) was a for-profit hospital, consisting of 110 hospital beds, 8 of which were reserved for ...
June 9, 2016

geography
Under the Soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources.
June 9, 2016

math
Find each value if cos A=12/13 with 0 (degrees) <= A <= 90 (degrees) and if sin B=8/17 with 90 (degrees) <= B <=180 (degrees) 1. sin(A+B) 2. cos(A-B) 3. tan(A-B)
June 6, 2016

Teachers aide
What are two types of wheelchairs used by the physically challenged students are the ?I think the two would be a orthosis and the power driven
June 3, 2016

Geometry
31.Identify the Hypothesis of the statement below. If you are riding on a train, then it will stop at every station on the line. A.You are riding on a train B.It will stop at every station on the line C.You are not riding on a train D.It will not stop at every station on the ...
June 2, 2016

Math
15 blocks
May 25, 2016

math plz help my last chance to do this homework
how do you post a pic
May 25, 2016

math plz help my last chance to do this homework
a) write an expression in simplest form for the perimeter of each triangle. b)write another expression in simplest form that shows the difference between the perimeter of the larger triangle and the perimeter of the smaller triangle.
May 25, 2016

Algebra
i think a is right
May 25, 2016

Algebra
Randall wants to mix 41 lb of nuts worth ​$2 per lb with some nuts worth ​$8 per lb to make a mixture worth ​$7 per lb. How many pounds of ​$8 nuts must he​ use? Pounds of nuts-cost per pound-total cost 41-$2-? x-$8-? ?-$7-? There is a chart and I...
May 24, 2016

Algebra
A chemist wishes to mix a solution that is 4​% acid. She has on hand 66 liters of a 2​% acid solution and wishes to add some 8​% acid solution to obtain the desired 4​% acid solution. How much 8​% acid solution should she​ add? There is a ...
May 22, 2016

Algebra
The height of Tower A is 940 feet more than Tower B. The two towers have a combined height of 1,540 feet. What are the heights of each​ tower?
May 22, 2016

BOB PURSLEY PLEASE HELP
What is the electrostatic force between one object with a charge of +5.0 × 10−6 C, and a second object with a charge of +2.0 × 10−6 C? The objects are 1.2 meters apart. In a pith ball experiment, the two pith balls are at rest. The magnitude of the ...
May 20, 2016

URGENT HELP
1.In a pith ball experiment, the two pith balls are at rest. The magnitude of the tension in each string is |T| = 0.55 N, and the angle between each string and a vertical line is θ = 27.33°. What are the values for the magnitudes of electrostatic force, Fq, and the ...
May 20, 2016

Physics
@bobpursley
May 20, 2016

Physics
One object has a charge of +5.0 × 10−6 C, and a second object has a charge of +2.0 × 10−6 C. The objects are 0.5 meters apart. What is the electrostatic force between them?
May 20, 2016

College Algebra
Pounds of nuts-cost per pound-total cost 41-$2-? x-$8-? ?-$7-? There is a chart and I have to fill in the question marks. x= 205/6 0r 34.16667
May 19, 2016

College Algebra
Randall wants to mix 41 lb of nuts worth ​$2 per lb with some nuts worth ​$8 per lb to make a mixture worth ​$7 per lb. How many pounds of ​$8 nuts must he​ use?
May 19, 2016

Chemistry
Calculate H2 Equation 1- CH4g+2O2g+CO2g+2H2OgH1=-890kj Equation 2- CH4g+O2g+CH2Og+H2OgH2=? Equation 3- CH2Og++O2g+CO2g+H20gH3=-518kj
May 19, 2016

Chemistry
Equation 1- 2Ss+3O2g+2SO3gh1=? Equation 2- 2Ss+2O2g+2SO2gh3=-594kj Equation 3- 2SO2g+O2g+2SO3gh3=-198kj Use Hess's law in your own words.
May 19, 2016

Chemistry
Consider this reaction N2g+O2g+2NOg H=180.5kj How much heat would be required to produce 1.300 mol NOg?
May 19, 2016

Chemistry
The reaction of 1 Mol of iron metal with 3 Mol aqueous HCI produces 1.5 mol H2 gas, 1 mol aqueous FeCI3, and 87.9 kj of heat. Write a thermochemical equation for this reaction
May 19, 2016

ELA
Yeah I get what your saying but I need a to write 2 or 3 paragraph a about what I want to know.. And I want to know the same thing you do but I don't know how to write that in a paragraph explaining!!
May 16, 2016

ELA
What are few questions and stuff that people or anyone would want to know about electrical engineering.... I need help writing 3 paragraphs based on that.
May 16, 2016

Chemistry
Calculate the number of moles of solute in each of the following solutions: Solution Moles of Solute 2.1 L of 0.21 M NH4HCO3 3.5 L of 0.28 M MgCO3
May 16, 2016

English p3
Traditional healers should be allowed to practice and prescribe medicines in hospitals and clinics and i agree with this topic. Speech should be in one page.
May 15, 2016

English
Speech about traditional healers should be allowed to practice and prescribe medicines in hospitals and clinics and I agree with this topic.
May 15, 2016

Engineering
What are few things that people want to know about electrical engineering??
May 14, 2016

Journalism
Anyone.. I am not really sure
May 11, 2016

Journalism
List the things that people actually want to know about electrical engineering
May 11, 2016

life orientation
People should stop engaging in fraud. it is not the only way to make a living. Being engaged in fraud will end you up on jail. You would loose momemts you would have with family
May 11, 2016

Journalism
What site
May 10, 2016

Journalism
I need 15 questions to ask an electrical engineer.
May 10, 2016

History essay
How to write a history essay based on a question with prompts?
May 10, 2016

Math
That's the issue I am having
May 6, 2016

Math
Find all of the solutions for this addition problem. Each different letter in the puzzle stands for a different digit. Letters that are the same stand for the same digit. Remember to include all of the criteria from the guidelines. ONE + ONE = TWO
May 6, 2016

math
seven horses are entered in a race. If two horses are tied for first​ place, and there are no ties among the other five ​horses, in how many ways can the seven horses cross the finish​ line?
May 6, 2016

math
horses are entered in a race. If two horses are tied for first​ place, and there are no ties among the other five ​horses, in how many ways can the seven horses cross the finish​ line?
May 6, 2016

Geograph
I need help writing a paragraph of why the stamp act of 1765 was not fair to the colonist.
May 5, 2016

Geography
Oops wrong one
May 5, 2016

Geography
The Stamp Act of 1765 was the first internal tax levied directly on American colonists by the British government. The act which imposed a tax on all paper documents in the colonies came at a a time when the British empire was deep in debt from the seven years war and looking ...
May 5, 2016

george mason
horses are entered in a race. If two horses are tied for first​ place, and there are no ties among the other five ​horses, in how many ways can the seven horses cross the finish​ line?
May 5, 2016

mason
seven horses are entered in a race. If two horses are tied for first​ place, and there are no ties among the other five ​horses, in how many ways can the seven horses cross the finish​ line?
May 5, 2016

Language Arts
Which of the following passages from the novel best illustrates the most extreme hostility between the Chinese and American communities in San Francisco?
May 5, 2016

geography
How coal is formed?
May 5, 2016

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