Posts by sarah

Total # Posts: 5,907

math
If you will triple the three it is called thrice but when you four what is it

Chemistry
Is NH4+ polar or non polar?

chemistry
Is NH4+ po;ar or non polar?

CALC
the exponent is (y-x^2)

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

CALCULUS
Yes but I'm not sure what the m>0 is for

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 ...

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

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

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

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

Calculus
So a=-1 That makes sense because it's continuous

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

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 ...

CALCULUS
Find the derivative of y=4sinx−2cosx

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

science
You know you dont need to copy, you can just take the main ideas, and then use your own words to describe thats what I ussually do.

Calc
Find the derivative of y=4sinx−2cosx

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

economics
How do you think the Demand and Supply patterns have changed in the United States since 2008 when the recession started?

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 ...

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.

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)

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

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 ...

Math
15 blocks

math plz help my last chance to do this homework
how do you post a pic

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.

Algebra
i think a is right

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...

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 ...

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?

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 ...

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 ...

Physics
@bobpursley

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?

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

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?

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

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.

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

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

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!!

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.

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

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.

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

Engineering
What are few things that people want to know about electrical engineering??

Journalism
Anyone.. I am not really sure

Journalism
List the things that people actually want to know about electrical engineering

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

Journalism
What site

Journalism
I need 15 questions to ask an electrical engineer.

History essay
How to write a history essay based on a question with prompts?

Math
That's the issue I am having

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

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?

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?

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

Geography
Oops wrong one

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 ...

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?

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?

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?

geography
How coal is formed?

precalculus
solve log(2+x)-log(x-3)=log2 I know the answer is 8

math
solve log(2+x)-log(x-3)=log2

English (research)
How can I prove that a superhero is a monster? i.e. - Spider-man

Data analysis
hello hi did you figure out how to do this? ahahha help

Math
Find the rotation in revolutions per minute given the angular speed and the radius given the linear speed and the rate of rotation. 1. w= 2.7 rad/s 2. v=24.8 m/s, 120 rev/min 3. w= 4/3Pi rad/hr Please help me with these problems! I am a visual learner and I learn best when ...

Math
2.2 is my answer.

Math
Meredith's new scale measures in both pounds and kilograms. The information on the box says the scale has a weight limit of 200 kilograms or 440 pounds. Using this information, approximate the unit rates of kilograms per pound and pounds per kilogram, to the nearest ...

economics
yes

Math/ELA
What can I do now as a 7th grader to prepare and save for college

Chem
Consider the following balanced equation: 2N2H4(g)+N2O4(g)→3N2(g)+4H2O(g) Complete the following table showing the appropriate number of moles of reactants and products. If the number of moles of a reactant is provided, fill in the required amount of the other reactant, ...

Calculus
two small planes take off from the same airport at the same time. One travels north at 200 km/h, and the other, west at 150 km/h. If the planes fly at the same altitude, how fast are they separating after 2 hours?

organic chemistry
Apart from the fact that between the two structures, only cyclohexe-4-ene-cis-1,2-dicarboxylic acid has the OH group shown on the IR spectrum. In what other majors way will the IR spectrum of cyclohex-4-ene-cis-1,2-dicorboxylic anhydride differ from the IR spectrum of ...

GEOMETRY HELP PLEASE
The bases of trapezoid $ABCD$ are $\overline{AB}$ and $\overline{CD}$. We are given that $CD = 8$, $AD = BC = 7$, and $BD = 9$. Find the area of the trapezoid.

History
“Without consideration of ‘traditions’ and prejudices, it [Germany] must find the courage to gather our people and their strength for an advance along the road that will lead this people from its present restricted living space to new land and soil, and hence ...

Precalculs
solve using matricies x+2y+3z=7 -x+2y-z=1 -x+y-2z=-2 x= y= z= ive tried everyway I can think of please help

History
What was the Columbian Exchange? A. The exchange of new goods globally as a result of European exploration B. A trading post established by Christopher Columbus C. An economic system set up by Christopher Columbus in the Americas D. The trading of goods from Columbia to North ...

History
thank you..its B

History
Sir Thomas More was executed because he A. would not stand with Henry VIII against the Protestant revolt. B. would not accept Henry VIII as head of the Church in England. C. protested the corruption of the Roman Catholic Church. D. set up a utopian community based on Calvinist...

Math
Use the acidity model given by pH = −log[H+], where acidity (pH) is a measure of the hydrogen ion concentration [H+] (measured in moles of hydrogen per liter) of a solution. Compute [H+] for a solution in which pH = 6.2. (Enter your answer in scientific notation. Round ...

Geometry- URGENT PLEASE HELP!!
Medians $\overline{AX}$ and $\overline{BY}$ of $\triangle ABC$ are perpendicular at point $G$. Prove that $AB = CG$. In your diagram, $\angle AGB$ should appear to be a right angle.

Business Stats
Regression Analysis: Avg. Tot. Score versus %Takers, T/S Ratio Model Summary S R-sq R-sq(adj) R-sq(pred) 34.2385 79.91% 79.06% 76.83% Coefficients Term Coef SE Coef T-Value P-Value VIF Constant 1118.5 39.5 28.34 0.000 %Takers -2.547 0.187 -13.62 0.000 1.05 T/S Ratio -3.73 2....

Math
Mr. Jacobs budgeted $1,200 for tiles his sketch of the floor requires him to use 38 white tiles each white tile cost $12

English
Ok, thanks. But how do I actually write the paragraph? As to say, in the 1st sentence what should I write? and same to the 2nd, 3rd , 4th, 5th, and so on. As an example..

English
How do I write a paragraph response based on a book-chapter? Thanks in advance!

Personal Finance
To stretch your income during retirement, you could: A. skip leisure activities. B. cut your food expenditures. C. cancel your life and property insurance. D. use your skills and time instead of your money. I think its A..

Personal Finance
If overall interest rates in the economy rise, a corporate bond with a fixed interest rate will generally: A. increase in value. B. decrease in value. C. remain unchanged. D. become worthless. B?

Math
Thank you

Math
Terry buys a shirt for $14.99 and a pair of jeans for $39.99. If the sales tax is 8.25%, what is the total price Terry pays for the items? Can someone please show me how to work this problem?

english
What best completes this statement about "London, 1802"? In Lines 9 and 10 Wordsworth uses _____. personification metaphor simile allusion line9 Thy soul was like a star, and dwelt apart; line10 Thou hadst a voice whose sound was like the Sea:

EASY Pre-Algebra
In the following situation, determine whether you are asked to determine the number of permutations or combinations. Then do the calculation. How many ways can the four offices of chairman, vice chairman, secretary, and treasurer be filled from a club with 28 members?

Physics
A ball is thrown from the ground toward a cliff of height h with a speed of 30.0 m/s and an angle of 60o above horizontal. It lands on the cliff 4.00 s later. How high is the cliff? Answer: 25.5 m But having difficulty getting this answer

Physics
You take a trip in your car. Starting from rest, you accelerate at 1.00 m/s2 for 10.0 s, heading north. You then stop accelerating and immediately head west at a constant speed for an additional 20.0 s, at which point, you crash into a building coming to an instant stop. At ...

Calculus
A landscape architect wished to enclose a rectangular garden on one side by a brick wall costing $60/ft and on the other three sides by a metal fence costing $50/ft. If the area of the garden is 102 square feet, find the dimensions of the garden that minimize the cost.

speech for history
Traditonal africa marriage is an advantage for men only,not women

Chemistry
Both ethanol (CH3CH2OH, MM=46.07g/mol) and methanol (CH3OH, MM=32.04g/mol) have been considered as fuels for automobiles. Which is the better fuel, on a per gram basis, when burned with oxygen? CH3CH2OH(g) DeltaHf(KJ/molrxn) = -235.10 H3OH (g) DeltaHf(KJ/molrxn) = -200.66 H2O...

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