# Posts by SARA

Total # Posts: 4,531

Chemistry
An organic compound consists of only carbon, hydrogen, and oxygen. Through combustion analysis, 5.671g of water and 36.933g of carbon dioxide are formed from 17.422g of sample. C:12.0 amu O: 16.0 amu H:1.0 amu In the space provided please write the empirical formula and, if ...

chemistry
Calculate the mass of oxygen gas required to occupy a volume of 6 L at a pressure of 20.9 kPa and a temperature of 37◦C.

Calculus
What is the solution to the following system of equations -2x+3y+z=5 x+5y+2z=17 To do this, I used elementary operations and isolated x to get 13y+5z=37. Is that correct so far? How would I continue?

Calculus
How would I find the equilibrant of three vectors? I am given a graph of three different vectors which meet at the point (0,0)

Calculus
If 3(a,3,2)-2(3,b,b)=(-3,1,-2) determine a and b. Describe the set spanned by the vectors. I don't know how to answer this

Solved?
I found the derivative of y=3x-1 which is y=3. Then I had the two differentiated equations equal one another: 2x+3=3 and solve for x: x=0 Then I subbed x into f(x)=x^2+3x+2 and got y=2 So the coordinate is (0,2)?

Calculus
What are the coordinates of the point on the graph of f(x)=(x+1)(x+2) at which the tangent is parallel to the line with equation 3x-y-1=0? a)(-3,2) b)(-1,0) c)(0,2) d)(1,6) To answer this, I put f(x)=(x+1)(x+2) into the form f(x)=x^2+3x+2 and found the derivative which is f&#...

Calculus
What does it mean to span in R2? I have this question: Which of the following sets if vectors span R2? a) {(1,1),(-2,-2)} b) {(1,1),(1,2)} c) {(1,2),(1/2,2)} d) {(-1,1),(1,-1)}

Calculus
Thanks! I was overthinking the question

Calculus
An airplane is heading due east with an airspeed of 220km/h when it encounters a wind from the south at 76km/h. What is the direction of the resultant velocity of the airplane The answer is E19.06°N but I don't know how

SOLVED
I made a mistake... i figured it out

calculus
For the function f(x)=x^3e^x, determine intervals of increase and decrease and the absolute minimum value of f(x) To do this I found the derivative which is f'(x)=3x^2e^x. Then I set it to zero: f'(x)=0 0=3x^2e^x How would I isolate x? And when I do, I would sub that x...

Calculus
Can you please explain how I would solve these questions? 1) Which point is 2 units from the line 12x-9y-5=0? a)(8,3) b)(7/6, -7/3) c)(14,6) d)(1,1) 2.) Which of the following sets of vectors spans R2: a) {(1,1),(-2,-2)} b) {(1,1),(1,2)} c) {(1,2),(1/2,2)} d) {(-1,1),(1,-1)}

Calculus
Susan pulls on a rope sleigh with a force of 120 N. If the rope makes an angle of 25 degrees with the horizontal, what is the force that tends to lift the sleigh? a)120.00 N b)108.76 N c)50.71 N d)84.85 N how would you know?

Help
What are some things you can skip?

Calculus
How would I find the second derivative if f(x)= √(x^3+2) using the quotient rule. I got to the step where [(12x√(x^3+2))-(9x^4/√(x^3+2))]/4(x^3+2) how would i go from that to: (3x(x^3+8))/(4(x^3+2)^3/2)

critical numbers
thanks!

critical numbers
How would I find the critical numbers of f'(x)=(x-3)^3(x+4)(x^2+1)? The answer is x=-4, x=3

English
What does Georgiana represent in "The Birthmark"? feminine perfection<----- evil and greed the rewards of hard work the price of madness

AP CHEM
The pKa of acetic acid is 4.74. What is the buffering range of this acid and its conjugate base? Explain.

Laboratory Chemistry
The activity of a stock isotope is 10,000 DPM/0.10mL. If 0.25 ml of this stock is placed in 2.50 ml of water, what is the activity in the diluted specimen? My guess is that I just multiply the 10,000 DPM by the 1/10 dilution factor. I then come up with 1,000DPM/0.10ml. Does ...

Vectors
correction, the two planes are coincident that the other intersects in line

Vectors
What is the nature of intersection of these three planes: 5x+3y-z=11 -2x-7y+10z=2 6x+21y-30z=-6 I know that the answer is two parallel planes and the other one intersecting in a line. my question is how would you know that the first equation intersects in a line? Would you use...

Vectors
Determine the vector equation of a plane that contains the line with symmetric equation (x+3)/-2=(y+1)/5=(z+2)/4 and the point P(1,3,0). For this question to find the direction vector you would use subtraction with the points (-3,-1,-2) and (1,3,0). Why would it be (1,3,0)-(-3...

Vectors
At what point does the line r=(-2,3,1)+s(2,3,-1) intersect the y-axis?

Vectors
thanks!

Vectors
What is the distance between the parallel lines having equations 2x+2y=16 and x+y=0? I'm getting 2 as my answer but the answer is supposed to be 4√2

Vectors
why does this equation 3xy +y = 0 represent two planes?

but I don't know how to make it into a video/commercial :(

I have to come up with a product (such as soap, face cream, shampoo, cleaning spray, etc) and make a commercial for it. and I have to make up a name for it and the stuff that's found in it. I can't think of any products, I was thinking a shampoo commercial but I don&#...

calc
If f(x) = 3x^2 − 2x, 0 ≤ x ≤ 3, evaluate the Riemann sum with n = 6, taking the sample points to be right endpoints.

socials
We're the sons of liberty justified in their treatment of the loyalists

Vectors
How would I convert cartesian equation to parametric? For example: 2x-y+3z-6=0

calc
A boat leaves a dock at 3:00 PM and travels due south at a speed of 20 km/h. Another boat has been heading due east at 15 km/h and reaches the same dock at 4:00 PM. How many minutes after 3:00 PM were the two boats closest together? (Round your answer to the nearest minute.)

Math
Some number added to -12 is 45. Add this number to 30. Multiply the answer by 3. What is the final number?

science
The answer is A. ventral tegmental area

Science
What does the electron shell rotate around?

Vectors
How are these two lines coincident? 1) r=(1,7)+s(2,5) 2) x=4t+3 y=10t+12

Jen purchased a condo in Naples Florida for \$699,000. She put 20% down and financed the rest at 5% for 35years. What are Jens total finance charge?

algebra
Factor: X^4 y-y^5

math
an airplane is flying 120 km south and 130km west of an airport. It is flying at a height of 10 km . what is the straight line distance to the airport?

linear algebra urgent
^ each of those 3 sets are vectors

linear algebra urgent
Use the Gram-Schmidt process to transform the basis 1 1 1 , 0 1 1 , 2 4 3 for the Euclidean space R3 into an orthonormal basis for R3.

Social Studies
The revolutionary war was fought on american soil. how do you think this fact influenced the role of women in war?

linear
Let W be the subspace of R5 spanned by the vectors w1, w2, w3, w4, w5, where w1 = 2 −1 1 2 0 , w2 = 1 2 0 1 −2 , w3 = 4 3 1 4 −4 , w4 = 3 1 2 −1 1 , w5 = 2 −1 2 −2 3 . Find a basis for W ⊥.

Ib math
The marks of 2376 students in an IB exam are normally distributed with mean 49 marks and variance 225 A) if the mark is 45 estimate the number of candidates who passed the exam? B) if top 7% of students are awarded a 7, find the minimum mark required to obtain a 7? mean=49 ...

World History
Thanks

World History
could you please explain what i'm suppose to do and give me some websites i can get information from.

World History
I need help. In a brief essay, explain three ways in which the Roman Catholic Church responded to the spread of Protestantism in the sixteenth century. Describe each part of the church’s response using specific facts.

astronomy
^ and any number or combination of those can be chosen.

astronomy
Even though I do not believe the Big Bang is what created the universe(although what people clam the bing bang was would have been similar to what happened when God said "Let there be light" I still have astronomy hw. haha. I am having trouble with this question. The...

linear algebra check
Use the Gram-Schmidt process to transform the basis [1 1 1] , [0 1 1] , [2 4 3] for the Euclidean space R3 into an orthonormal basis for R3. (Enter each vector in the form [x1, x2, ...]. Enter your answers as a comma-separated list.) so i went through the process and got [1/...

English
i meant A

calc
how did you expand the determiannt

calc
If possible, find a, b, and c so that v = [a b c] is orthogonal to both w = [1 6 1] and x = [1 −9 1]

engr
what useful product can you make using recyclable items?

AP Chemistry
A 5.0 M solution of HNO3 is titrated with 0.3 M NaOH. Identify the species that have the highest concenttrations in the solution being titrated halfway to the equivalence point. A 25.15 ml of 0.35 m HNO3 was titrated with an unknown concentration of NaOH. The endpoint was ...

math check
determine whether the given vector A in M22 belongs to the span (a1,a2,a3) where a1=[1 -1; 0 3] a2=[1 1; 0 2] a3=[2 2; -1 1] and A=[5 1; -1 9] so I set up an augmented matrix , but im not sure if I set it up correctly. I made a1 a2 and a3 into columns. 1 1 2 | 5 0 0 -1 | -1 -1...

statistics
.1587

AP Chemistry
A buffered solution was created by mixing solutions of NH4Cl and NH3 at 25 C. Which species, NH4+ or NH3, has the highest concentration in this buffered solution?. Justify your answer.

accounting
If a business is purchased by the issue of 10000 \$10 8% debentures trading at \$95, how much is the purchase consideration? I did 10000x95, but the answer in the key is  option D instead, 95000, not 950,000... I'm totally confused..

Math.
Half of Allan's test score plus eight equals 50. What did Allen score on his test?

math
When the equation of a line is written in general form, Describe the Slope of the line when A=0 or and B=0 ? Thanks!

math
Verify that the function satisfies the three hypotheses of Rolle's Theorem on the given interval. Then find all numbers c that satisfy the conclusion of Rolle's Theorem. (Enter your answers as a comma-separated list.) f(x) = 5 − 6x + 3x2, [0, 2] can someone ...

Vectors
How would I find the direction vector parallel to a line? For example, how is (2,1) a direction vector parallel to the line -x+2y-10=0

Vectors
determine the number of solutions, the generalized parametric solution, and explain why there are no integer solutions for the equation 2x+10y=31

Vectors
Can you please explain how to answer this? What is a solution for the following system? x-4y+z=2 and -x+4y-2z=8 a) x=4s+12, y=s, z=-10 b) x=s+4, y=3s, z=-4 c) x=2s+5, y=s, z=-12 d) x=s, y=4s, z=-12

Vectors
Multiple choice: Can you please explain how to answer this? Which point does not lie on the same plane as the points P(1,5,6), Q(-2,-3,4) and R(-1,3,2) a) S(0,4,4) b) S(4,13,8) c) S(0,-1,8) d) S(1,-3,2)

Vectors
What is the distance between the parallel lines having equations 2x+2y=16 and x+y=0 a) 16 b) 4 root 2 c) 2 d) 8 I got the answer 2. I solved for y in the 2x+2y=16 equation and got 8. that gave me point (0,8) I used the d= (ax+by+c)/root (a^2+b^2) using the equation x+y=0 and ...

Vectors
To answer this I would just sub in the x and y values right? I got a) as my answer since it equals 0. Which of the following would describe the sketch of the expression xy+2y-3x-6=0 a) the planes x=-2 and y=3 b) the planes x=3 and y=-2 c) the planes x=6 and y=2 d) the planes x...

Vectors
can you please explain how to answer this: Which of the following is not a plane a) r=(1,3,4)+s(2,-1,2)+t(1,1,1), s,t∈R b) r=(2,4,2)+s(1,-2,3)+t(3,2,2), s,t∈R c) r=(3,2,3)+s(4,-4,2)+t(-2,2,-1), s,t∈R d) r=(-2,1,4)+s(2,2,-1)+t(2,2,1), s,t∈R

Vectors
The shortest distance between a point and a line occurs at: a) infinitely many points b) one unique point c) random points d) a finite number of points

Vectors
Multiple choice. How would I answer this in a short way? what is the distance between the skew lines L1:(0,4,-3)+s(-1,1,3),seR and L2: (1,2,5)+t(-3,2,5),teR? a) 4 root 2 b) 7/2 c) root 2 d) (7 root 2)/2

Vectors
no clue how to answer it. I put each slope into the y=mx+b formula and found the b values, but i'm not sure if i'm supposed to do that

Vectors
Two lines with the slopes m1=4/3 and m2=-7/2 intersect at (3,4). Determine the equations of the two lines and check your answer by solving them

Vectors

Vectors
Determine the vector equation of a line passing through the point P(3,2,-1) and with a direction vector perpendicular to the line r=(2,-3,4)+s(1,1,-2), seR

Calculus
Determine the slope of the tangent to the function f(x)=5e^x - 2e^(2x) at the point with x-coordinate x=1

math
How would I write the equation y=3.9657(0.9982^x) in the format of g(x)=f(x)+f(x-60)?

Calculus
Find an equation of a line tangent to y = 2sin x whose slope is a maximum value in the interval (0, 2π] I believe the equation is y=2x-4pi. How is the b-value -4pi?

Vectors
Explain why the planes 3x-6y-9z+5=0 and x+2=2y+3z never intersect

Vectors
Does the point of intersection between L1:(4,9,2)+s(1,-1,-1), seR and Ls: (2,11,4)+t(5,-3,-4), teR lie on the plane 3x-2y+3z+4=0?

math
How would I solve this equation for x? 0=3.9657(0.9982^x)ln0.9982

Calculus
How would I find the instantaneous rate of change using this formula y=3.9657(0.9982^x) and given a table of values?

Swakop High
John has \$6000 to invest. He invests part of it at 5% and the rest at 8%.How much should be invested at each rate to yield 6% on the total amount?

Vectors
would it be d?

Vectors
which is not a possible type of intersection between three planes? a) intersection at a point b) three coincident planes c) intersection along a line d) intersection along a line segment I know that planes can intersect in a line but I don't know which of c and d would be ...

Math
Explain how the order of operations determines how you simplify a numeric expression. explain the rules for addition, subtraction, multiplication, division, and the use of grouping symbols.

College Algebra
John invested his savings in two investment funds. The \$12,000 that he invested in Fund A returned a 3% profit. The amount that he invested in Fund B returned a 10% profit. How much did he invest in Fund B, if both funds together returned a 6% profit?

Vectors
Also, R(-9,18) lies on the line

Vectors
How would you write a vector equation for a line using parametric equations? For example: A line is defined by x=-2-t and y=4+2t,teR. a) Write a vector equation for this line using parametric equations. b) write a second vector equation different from the first

Calculus
For the question "Determine the equation of the tangent to the curve y = xtanx at the point with x-coordinate π." how is the answer -πx + y + π2 = 0?

calc
At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 30 km/h. How fast is the distance between the ships changing at 4:00 PM?

chemistry
Monosodium glutamate (MSG), a food-flavor enhancer, has been blamed for “Chinese Restaurant Syndrome,” the symptoms of which are headaches & chest pains. MSG has the following composition by mass: 35.51 percent C, 4.77 percent H, 37.85 percent O, 8.29 percent N, & 13...

Chemistry
Monosodium glutamate (MSG), a food-flavor enhancer, has been blamed for “Chinese Restaurant Syndrome,” the symptoms of which are headaches & chest pains. MSG has the following composition by mass: 35.51 percent C, 4.77 percent H, 37.85 percent O, 8.29 percent N, & 13...

History
the 2nd one

History
Which best describes a similarity between the outcomes of the French and American revolutions? They brought about a return to absolute monarchy in both countries. They changed the world's ideas about how nations should be ruled. Both countries embraced democracy and set up...

History
Which action by the National Assembly was inspired by Enlightenment ideals and the American Revolution? It added a Bill of Rights to the French constitution. It issued the Declaration of the Rights of Man. It set up a federal tax system based on income. It banned organized ...

English Lit.
meaning of illustration in a question

Algebra II
3885=10t^3+115t^2+25t+2505 −10t3−115t2−25t+1380=0 −5(t−3)(2t2+29t+92)=0 t−3=0 2t2+29t+92=0 t=3 1992

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