Monday
April 20, 2015

Posts by SAra


Total # Posts: 3,959

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 ...
April 20, 2015

Vectors
correction, the two planes are coincident that the other intersects in line
April 19, 2015

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...
April 19, 2015

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...
April 19, 2015

Vectors
At what point does the line r=(-2,3,1)+s(2,3,-1) intersect the y-axis?
April 18, 2015

Vectors
thanks!
April 17, 2015

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
April 17, 2015

Vectors
why does this equation 3xy +y = 0 represent two planes?
April 17, 2015

Project help please!!
but I don't know how to make it into a video/commercial :(
April 16, 2015

Project help please!!
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&#...
April 16, 2015

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.
April 16, 2015

socials
We're the sons of liberty justified in their treatment of the loyalists
April 15, 2015

Vectors
How would I convert cartesian equation to parametric? For example: 2x-y+3z-6=0
April 14, 2015

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.)
April 14, 2015

Math
Some number added to -12 is 45. Add this number to 30. Multiply the answer by 3. What is the final number?
April 14, 2015

Science
What does the electron shell rotate around?
April 13, 2015

Vectors
How are these two lines coincident? 1) r=(1,7)+s(2,5) 2) x=4t+3 y=10t+12
April 12, 2015

business math
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?
April 12, 2015

algebra
Factor: X^4 y-y^5
April 11, 2015

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?
April 10, 2015

linear algebra urgent
^ each of those 3 sets are vectors
April 9, 2015

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.
April 9, 2015

Social Studies
The revolutionary war was fought on american soil. how do you think this fact influenced the role of women in war?
April 9, 2015

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 ⊥.
April 9, 2015

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 ...
April 9, 2015

World History
Thanks
April 6, 2015

World History
could you please explain what i'm suppose to do and give me some websites i can get information from.
April 6, 2015

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.
April 6, 2015

astronomy
^ and any number or combination of those can be chosen.
April 5, 2015

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...
April 5, 2015

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/...
April 4, 2015

calc
how did you expand the determiannt
April 2, 2015

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]
April 2, 2015

engr
what useful product can you make using recyclable items?
April 1, 2015

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 ...
March 29, 2015

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...
March 28, 2015

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.
March 26, 2015

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..
March 25, 2015

Math.
Half of Allan's test score plus eight equals 50. What did Allen score on his test?
March 24, 2015

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!
March 24, 2015

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 ...
March 23, 2015

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
March 20, 2015

Vectors
determine the number of solutions, the generalized parametric solution, and explain why there are no integer solutions for the equation 2x+10y=31
March 17, 2015

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
March 17, 2015

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)
March 17, 2015

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 ...
March 17, 2015

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...
March 17, 2015

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
March 17, 2015

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
March 17, 2015

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
March 17, 2015

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
March 16, 2015

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
March 16, 2015

Vectors
would the answer be r-(3,2,-1)+s(1,1,1)
March 16, 2015

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
March 16, 2015

Calculus
Determine the slope of the tangent to the function f(x)=5e^x - 2e^(2x) at the point with x-coordinate x=1
March 16, 2015

math
How would I write the equation y=3.9657(0.9982^x) in the format of g(x)=f(x)+f(x-60)?
March 14, 2015

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?
March 14, 2015

Vectors
Explain why the planes 3x-6y-9z+5=0 and x+2=2y+3z never intersect
March 14, 2015

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?
March 14, 2015

math
How would I solve this equation for x? 0=3.9657(0.9982^x)ln0.9982
March 14, 2015

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?
March 13, 2015

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?
March 13, 2015

Vectors
would it be d?
March 11, 2015

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 ...
March 11, 2015

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.
March 10, 2015

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?
March 10, 2015

Vectors
Also, R(-9,18) lies on the line
March 9, 2015

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
March 9, 2015

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?
March 9, 2015

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?
March 9, 2015

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...
March 6, 2015

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...
March 6, 2015

History
the 2nd one
March 4, 2015

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...
March 4, 2015

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 ...
March 4, 2015

English Lit.
meaning of illustration in a question
March 2, 2015

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
March 1, 2015

Chemistry
Looks like 0.046 mol NH4OH. So, I just multiply the moles and liters and then compare the two values? The balanced equation isn't really necessary?
March 1, 2015

Chemistry
If I have 50.0 mL of HA at a concentration of 1.20M and 50.0 mL of NH4OH at a concentration of 0.92M, how many moles of the limiting reactant are there? I guess I should start with a balanced equation, but I have no idea where to start..
March 1, 2015

Math
Find the intersection of the sets A = {3, 4, 7, 9, 13} and B = {3, 7, 10, 13, 17}. null set {3, 7, 13} {3, 4, 7, 9, 10, 17} {3, 4, 7, 9, 10, 13, 17}--- my answer Question 3.3. Choose the correct answer. Find the union of the two sets A = {4, 8, 10, 12, 14} and B = {12, 14}. {...
February 26, 2015

math
let V be the set of all real-valued continuous functions defined on R1. If f and g are in V, we define f ¨’ g by (f ¨’ g)(t) = f(t) + g(t). If f is in V and c is a scalar, we define c f by (c f)(t) = cf(t). Then V is a vector space, which is denoted by C(&#...
February 26, 2015

math question
how is this not a subspace of R3? The set of all vectors of the form a b c , where a > 0.
February 26, 2015

History
Thanks
February 26, 2015

History
What do we mean when we say the modern world? When did it begin? How is it different from the pre-modern world?
February 26, 2015

Chemistry Pre-AP
What volume of oxygen gas can be collected at 0.565 atm pressure and 48.0◦C when 42.9g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆−−−−→2KCl(s) + 3O2(g) MnO2
February 25, 2015

AP Chemistry
iN A LAB, the orders of two reactants, A and B, were determined experimnetally to be 2 and 3 respectively. a. write the rate law for this reaction. c. what would happen to the rate of the reaction if A were Doubled? d. what would happen to the rate of the reaction if B were ...
February 24, 2015

Life skills
Why and how someone would prioritize their values?
February 23, 2015

History
is it the first?
February 23, 2015

History
Which was not a motivation for European exploration in the fifteenth and sixteenth centuries? the Muslim invasion of Spain the desire to find a sea route to Asia-} my answer the promise of riches intellectual curiosity
February 23, 2015

art
where is the negative space in the rubin case?
February 23, 2015

Chemistry
Using household bleach and saltwater of the same molarity, describe the quantities of each that would me needed to make 30 ml of a solution that contained 50% of the hypochlorite in household bleach.
February 22, 2015

statistics
Estimate the multiple linear regression equation relating number of cups of coffee per week, female sex, and number of hours of exercise per week, considered simultaneously, to GPA. Consider GPA the dependent, or outcome variable. my answer: GPA= 7.301 -1.649 (female sex) -0....
February 20, 2015

Calculus
also, how is y=2x? did you use y=mx+b? which numbers did you substitute?
February 17, 2015

Calculus
because f'(0)=2cos(0)=2?
February 17, 2015

Calculus
how is the slope of 2sinx=2?
February 17, 2015

Calculus
i found the derivative to be y'=2cosx but i don't know what to do next
February 17, 2015

Calculus
Find an equation of a line tangent to y = 2sin x whose slope is a maximum value in the interval (0, 2π]
February 17, 2015

Calculus
Thanks!
February 15, 2015

Calculus
determine the absolute extreme values of the function f(x)=sinx-cosx+6 on the interval 0<=x<=2pi. This is what i did: 1.) i found the derivative of the function which is f'(x)=cosx+sinx 2.) I set f'(x)=0 and got sinx/cosx=-1 which is tanx=-1 and then x=3π/4...
February 15, 2015

Calculus
Can someone please explain how to solve this type of question? Determine the maximum and minimum value of the function f(x)=3x3^x - 1
February 14, 2015

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