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December 21, 2014

Posts by Jake


Total # Posts: 1,791

writing skills
6. Which of these is a run-on sentence? A. You and I and the whole team will go. [B. I thought about what he'd said soon I realized he was right.] C. I went home and ate and ate. D. Before lunch, I played volleyball; after lunch I did again.
July 2, 2012

writing skills
5. Which of the following is a complex sentence? A. I would like to visit the Kinshasa, but I understand the city is unsafe for foreigners. [B. As Jake was reading the letter from June yet again, the flight attendant coughed gently to get his attention.] C. Check out the ...
July 2, 2012

writing skills
4. Which of the following best illustrates a pair of sentences that are joined by an understood relationship? A. I don't understand a word you said. Have you taken a course in English literature? B. Luke put three dollars into the office football pool. He was looking ...
July 2, 2012

writing skills
3. Which of the following sentences has a compound predicate? A. She raced along the path to beat him to the beach. B. She placed the shells in a plastic bag while he dried himself off. [C. She washed the shells and dried them in the sun.] D. While he swam, she collected ...
July 2, 2012

Math
number 16. is 2/3 not 3/4
July 1, 2012

math
When he was 17 her sister was 34 so when he is 23 which is 6 years later her sister would be 34+6 which is 40 years old
June 25, 2012

Precalculus
Given sinx= -1/8 and tanx<0. find sin2x
June 25, 2012

Science
What is the pH of 115 mL of a 1.50 m solution of HNO2 that is titrated with a 1.50 M solution of LiOH at the equivelence point?
June 20, 2012

Chemistry
Ag2S is an insoluable black solid. Would more solid dissolve, or precipitate once the following are added to the solution. 1. KS-----I know [S] increases, shift to reactants side, precipitate 2. HClO 3. LiOH 4. NH4OH
June 20, 2012

math
Twenty people apply for seven jobs that are available at fly by night aircraft company 12 are men and the rest are women. How many seven person groups have exactly three men? How many of these seven person groups have exactly three men or three women?
May 24, 2012

math
Twenty people apply for seven jobs that are available at fly by night aircraft company In how many ways could such a group be composed? After the seven have been selected, in how many different ways could five of them be assigned to the assembly department?
May 22, 2012

Sci.
The boundary between 2 plates moving together is calle _______.
May 20, 2012

trig
write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x
May 17, 2012

trig
find the angle between vector U=<2,3> and V=<1,-5> answers: 88 degrees, 45 degrees, 135 degrees, or 92 degrees...?
May 17, 2012

Chemistry
A solution of formic acid 0.20 M has a pH of 5.0. What is its Ka value? a) 5.0 x 10-10 b) 1.0 x 10-5 c) 5.0 x 10-5 d) 25
May 16, 2012

Chemistry
Mols benzoic acid = 12.2g/122.12g = 0.0999 Int. Concentration of Benzoic acid = 0.0999 mol/ 0.500L = 0.1998 M Ka = 6.3 x 10-5 = (x)(x)/0.1998 – x X = [H+] = * M pH = -log(*) = * Sorry, this question is just really confusing me..
May 16, 2012

Chemistry
Thanks so much, you're an awesome help.
May 16, 2012

Chemistry
Mols benzoic acid = 12.2g/122.12g = 0.0999 Int. Concentration of Benzoic acid = 0.0999 mol/ 0.500L = 0.1998 M Ka = 6.3 x 10-5 = (x)(x)/0.1998 – x X = [H+] = * M pH = -log(*) = * Sorry, this question is just really confusing me..
May 16, 2012

Chemistry
Calculate the pH of a solution prepared by dissolving 12.2 g of benzoic acid in enough water to produce a 500 mL solution. Ka = 6.3 x 10^-5
May 16, 2012

Chemistry
Can a solution of CrCl3 be stored in an aluminum container?
May 15, 2012

Chemistry
Using the following spontaneous reactions, classify the 3 metals involved (Cr, Sn, Al) according to increasing reductant properties. a) 2Cr + 3Sn2+ 2Cr3+ + 3Sn b) Al + Cr3+ Al3+ + Cr
May 15, 2012

Chemistry
Which pair of ions will be most likely to react at standard state conditions? 1. a) MnO4- and Sn2+ 2. b) Zn2+ and Cl- 3. c) I- and Cu 4. d) Fe3+ and Cu2+
May 15, 2012

Chemistry
If a piece of copper metal is dipped into a solution containing Cr3+ ions, what will happen? Explain with Ev values
May 15, 2012

Chemistry
Pb(NO3)2(aq) 2 x 10-3 M Na2SO4(aq) 2 x 10-3 M Pb(NO3)2(aq) + NaSO4(aq) → PbSO4(s)+ 2NaNO3(aq) a) What are the concentrations of each ion within this solution? b) If 1L of each solution is mixed; will a precipitate form? why?
May 15, 2012

Spanish-8th grade Help!
Thank you- I think what I put is right- I've rechecked it but it seems so odd the way I have it.I know it's a reflexive so maybe it is correct.
May 12, 2012

Soanish-8th grade Help!
I'm trying to conjugate this in the past tense tú/presentarse would I conjugate it in past tense like this- (tú te presentaste) Something looks wrong with it
May 12, 2012

math
what is the first step in solving the equation x/5 - 9=6?
May 9, 2012

Physics Help
So is there no shift? and if so why is that the case?
May 9, 2012

Physics Help
If we witness events taking place on the moon, where gravitation is weaker than on Earth, would we expect to see a gravitational red shift or a gravitational blue shift? and Explain please a)blue shift b)red shift c)no shift
May 9, 2012

Chemistry
The following reaction has a Delta G value of 42.6 kJ/mol at 25oC: HB(aq) +H2O(l) --> H3O+(aq) +B-(aq) Calculate Ka for the acid HB.
May 7, 2012

Physics Help!!
Comparing Einstein's and Newton's theories of gravitation, can the correspondence principle be applied? and Why or Why not? a)Yes b)No
May 7, 2012

Physics Help please
If we witness events taking place on the moon, where gravitation is weaker than on Earth, would we expect to see a gravitational red shift or a gravitational blue shift? and Explain please a)blue shift b)red shift c)no shift
May 7, 2012

Chemisttry
A 100.0-mL sample of 0.250 M aniline (C6H5NH2) is titrated with 0.500 M HCl. What is the pH at the equivalence point?
May 6, 2012

Chemistry
You take 326 g of a solid (melting point = 57.6oC, enthalpy of fusion = 346 J/g) and let it melt in 757 g of water, and the water temperature decreases from its initial temperature to 57.6oC. Calculate the initial temperature of the water. (Note that the specific heat ...
May 6, 2012

Physics Help!!
A passenger on an interplanetary express bus traveling at v = 0.94c takes a seven-minute catnap by his watch. How long does the nap last from your vantage point on a fixed planet?
May 5, 2012

Physics Help please
A bus moving with speed 0.93c is 65 feet long according to its passengers and driver. What is its length from your vantage point on a fixed planet?
May 5, 2012

Chemistry
Thanks it worked perfectly
May 3, 2012

Chemistry
there isnt a kp or a kc
May 3, 2012

Chemistry
Nitrogen gas (N2) reacts with hydrogen gas (H2) to form ammonia (NH3). At 200 oC in a closed container, 1.1 atm of nitrogen gas is mixed with 2.1 atm of hydrogen gas in an otherwise empty container. At equilibrium, the total pressure is 2.2 atm. Calculate the partial pressure ...
May 3, 2012

Physics!!
Green light is emitted when electrons in a substance make a particular energy-level transition. If blue light were instead emitted from the same substance, would it correspond to a greater or lesser change of energy in the atom? and why?
May 2, 2012

calculus
what is the integer values of n that satisfies this inequality -5<3n<12? Please answer :)
May 1, 2012

chemistry
Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 16.9 g of butane is mixed with 39. g of oxygen. Calculate the minimum mass of butane that could be left over by the chemical reaction. Round your answer to 2 significant...
April 30, 2012

chemistry
Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 16.9 g of butane is mixed with 39. g of oxygen. Calculate the minimum mass of butane that could be left over by the chemical reaction. Round your answer to 2 significant...
April 30, 2012

math
if you invest 500 dollars in a savings account that pays 8% interest per year, compounded quarterly, how much will you have in the account at the end of 11.6 years?
April 26, 2012

statistics
What type of statistical information would I include in my report to determine our year-to-date performance of our division; example, mean, median, or standard deviation.
April 26, 2012

Life orientation
It damages communities
April 24, 2012

Math
In an election, ethan got 5 fewer votes than christohper,who got 3 more votes than olivia, who got 4 fewer votes than Ava. How many more votes did ava get than ethan ?
April 21, 2012

math
Given P(x) = x^3 - 3x^2 - 5x + 10 a evaluate P9x) for each integer value of x from -3 through 5 b. Prove that 5 is an upper bound on the zeros of P(x)
April 21, 2012

Physics
Two masses, m1=3kg and m2=2kg, are suspended with a massless rope over a pulley of mass M = 10kg. The pulley turns without friction and may be modeled as a uniform disk of radius R=.1m. You may neglect the size of the masses. The rope does not slip on the pulley. The system ...
April 18, 2012

Calculus
Suppose vectors a and b are vectors such that a x b =(3,1,4). What is the cross product of twice of a with twice of b?
April 17, 2012

Calculus/Physics Please help!!
An intravenous line provides a continuous flow of drug directly into the blood. Assuming no initial drug in the blood, the amount of drug in the blood t hours after the dosing begins in m(t) - (a/k)(1-e^-kt), for t (=>)0, where k is the rate constant (again related to half ...
April 17, 2012

CALCULUS PLEASE HELP!!
suppose m(0) milligrams of a drug are put in the blood of an injection. The amount of drug t hours after the injection is given by m(t)=m(o)e^-kt, for t (=>) 0, where k is the rate constant, which is related to the half life. we also treat oral administration of drugs as an...
April 17, 2012

Calculus
Could someone please explain on how to do this question step-by-step. Thank you! A bolt is being loosened by a 40 cm wrench. The torque in this situation has a magnitude of 12 J and the force makes an angle of 60 degree with the wrench. What is the magnitude of the force used ...
April 17, 2012

CALCULUS PLEASE HELP!!
suppose m(0) milligrams of a drug are put in the blood of an injection. The amount of drug t hours after the injection is given by m(t)=m(o)e^-kt, for t (=>) 0, where k is the rate constant, which is related to the half life. we also treat oral administration of drugs as an...
April 15, 2012

Calculas
suppose m(0) milligrams of a drug are put in the blood of an injection. The amount of drug t hours after the injection is given by m(t)=m(o)e^-kt, for t (=>) 0, where k is the rate constant, which is related to the half life. we also treat oral administration of drugs as an...
April 15, 2012

Calculus
I checked in the book answer and the site u gave me matched with the answer. How did the website get solutions as: x= -3.28183 x= -1.863
April 14, 2012

Calculus
Use the algorithm for curve sketching to sketch the graph of each function. a) f(x) 4x^3+6x^2-24x-2 1. First to find intercepts y=0 0=4x^3+6x^2-24x-2 =2(2x^3+3x^3-12x-1) I don't know how to find the x-intercept. I can't use quadratic formula or synthetic division :S
April 14, 2012

Math help
So do I draw lines through the vertices?
April 12, 2012

Math help
Sketch the graph: (x+2)^2/25-(y+4)^2/25=1 I don't understand this at all! When I tried graphing it I just had two lines going through the center, which is (-2,-4). But it should be a hyperbola, right? Could anyone help me?
April 12, 2012

World History
During the Columbian Exchange what diseases were brought from the new world to Europe?
April 11, 2012

HELP PLEASE PHYSICS!!
Thank you!!!
April 9, 2012

HELP PLEASE PHYSICS!!
How much does it cost to operate a 100 W lamp continuously for 1 week if the power utility rate is 8/kWh? answer in $
April 9, 2012

Physics Need Help PLEASE
okay great!!! Thank you again!!!! you do a wonderful job!!!!
April 9, 2012

Physics Need Help PLEASE
its looking for the N/C I got 4*10^-21 but I'm not getting it correct
April 9, 2012

Physics Need Help PLEASE
Thank you so much Elena that helped me out a lot! I was wondering if you could also help me with another question. A droplet of ink in an industrial ink-jet printer carries a charge of 6 10-13 C and is deflected onto paper by a force of 2.4 10-7 N. Find the strength of the ...
April 9, 2012

Physics Need Help PLEASE
Two point charges are separated by 8 cm. The attractive force between them is 14 N. If the two charges attracting each other have equal magnitude, what is the magnitude of each charge?
April 9, 2012

Calculus
Which plane goes through the origin and is perpendicular to the line r=(2,-2,1) + s(2,3,-4), seR? a) 2x-2y+z=0 b) 2x+3y-4z=0 c) 2x+3y+z-4=0 d) none of the above. I got D, none of the above. I have substituted and couldn't find the answer equal to zero.
April 8, 2012

Calculus
Are the points P(1,2), Q(7,3) and R(-2,1) o the line with vector equation r=(19,5) +s(6,1), SeR
April 8, 2012

Calculus
which pair of lines are perpendicular? a) 2x + 3y - 7=0, -3x - 2y + 2=0 b) 2x - 3y + 2=0, 5x - 7y + 2=0 c) -4x + y - 3=0, x + 4y=0 d) -5x + y + 1=0, 5x + y + 1=0 Please explain. I know we have to use the dot product :3
April 7, 2012

engineering mechanics
14 degrees
April 5, 2012

Calculus
A rusted bolt requires 30 J of torque to be loosened. If only 40 N of force is applied to a wrench with which it makes a 90° angle, how long is wrench?
April 2, 2012

Calculus
Determine the value(s) of k such that the area of the parallelogram formed by vectors a = (k+1, 1,-2) and b =(k,3,0) is [sqrt(41)]
April 2, 2012

Calculus
For which value(s) of k will the dot product of the vectors (k,2k-1, 3) and (k,5,-4) be 7? I did this so far, 2k-1=5 6/2 k=3
March 29, 2012

College Chemistry
Write three equations (including ΔH values) that represent the heats of formation for each C6H12O6(s), CO2(g), and H2O(l). (Hint: look up heats of formation for each participant)
March 29, 2012

Calculus
Two force vectors act on an object and the dot product of the two vectors is 20. If both of the force vectors are doubled in magnitude, what is their new dot product?
March 29, 2012

Calculus
Sorry for the confusion. May I ask why my answer does not work? :S its asking for the vertices, not equal to Point P.
March 27, 2012

Calculus
Why add?
March 27, 2012

Calculus
I am bit of confused from this question. I have shown the work below and to subtract, am I supposed to be X2 - X1, Y2-Y1, Z2-Z1? or X1-X2, Y1-Y2, Z1-Z2? ------------------------------------ A triangle has sides formed by the vectors PA=(2,7,3) and PB=(6,2,2). The point P=(1,3,...
March 27, 2012

Physics
A box of mass m=1.5 kg is attached to a spring with force constant k=12 and suspended on a frictionless incline that makes a 30 degree angle with respect to the horizontal. With the spring in its unstretched length, the box is released from rest at x=0. The box slides down the...
March 27, 2012

Calculus
I am bit of confused from this question. I have shown the work below and to subtract, am I supposed to be X2 - X1, Y2-Y1, Z2-Z1? or X1-X2, Y1-Y2, Z1-Z2? ------------------------------------ A triangle has sides formed by the vectors PA=(2,7,3) and PB=(6,2,2). The point P=(1,3,...
March 27, 2012

Calculus
1. Which of the following sets of vectors spans [r^2] ? a) {(1,1), (-2,-2)} b) {(1,1), (1,2)} c) {(1,2), (1/2,2)} d) {(-1,1), (1,-1)} 2. Which of the following sets of vectors spans [r^3] ? a) {(1,1,1), (2,2,2)} b) {(1,3,1), (2,2,2)} c) {(1,2,1), (1/2,1,1/2)} d) {(1,3,2), (-1...
March 27, 2012

Calculus
Point A=(1,3,4) and point B=(-2,2,0). Determine AB. a) (3,1,4) b) (-3,-1,-4) c) (-1,5,4) d) (1,5,4) I chose answer C. 2. A goes from (2,1) to (4,-1) Determine the components of A. a) (6,0) b) (-2,2) c) (2,-2) d) (0,6)
March 26, 2012

Calculus
Vector D represents: URL is here imgur dot com/AX4EN a) A+B b) A-B c) C+B d) A+C I chose answer A. Is that the correct answer?
March 26, 2012

Chemistry
How many moles of nitrogen are needed to produce 1.52 moles of nitrogen (ll) oxide ? N2 + O2 > FeCL3 + 3H20
March 24, 2012

Algebra
Use the substitution method to solve -x + 3y=24 5x +8y=-5
March 23, 2012

Calculus and vectors
|C|=5 and |D|=8. The angle formed by vectors C and D is 35 degrees, and the angle formed by vectors A and C is 40 degrees. Determine |B|. Could someone explain this question
March 23, 2012

fractions
6/8 pizza left, which can be reduced to 3/4.
March 23, 2012

Calculus and vectors-Help~David
Thank you very much!
March 22, 2012

Calculus and vectors-Help~David
Rectangular prism is defined by vectors (2,0,0)(0,9,5) and (0,0,3). Find the volume. I have done this so far, would anyone please verify this. (2,0,0)(0,9,6) (0-2, 9-0, 6-0) =(-2,9,6) (-2,9,6)(0,0,3) =(2,-9,-3) (2)(-9)(-3)=54 cm^3 Therefore volume is 54 cm^3
March 22, 2012

Calculus
Is B=(2,-1,-6)?
March 22, 2012

Calculus
If A=(1,2,4) and Vector A+B =(3,1,-2). What is B?
March 22, 2012

Calculus and vectors @ Bob Purs
I multipled by 2 since its a rectangle, there is an example of similiar to this question but its a triangle.
March 22, 2012

Calculus and vectors @ Bob Purs
Rectangle side is represented by (2,3) and (-6,4). Find the perimeter of rectangle. Is this correct? (-6-2), 4-3) sqrt(8^2+1^2) sqrt(65) =8.062257748(2) =16.124?
March 22, 2012

Math
Is this correct? ((-6-2), 4-3) sqrt(8^2+1^2) sqrt(65) =8.062257748(2) =16.124?
March 22, 2012

Math
Rectangle side is represented by (2,3) and (-6,4). Find the perimeter of rectangle. Do I have to find the magnitude of (2,3) and (-6,4) and square root the answer?
March 22, 2012

Calculus
Thank you for answering. Don't I have to find the magnitude then use square root of the answer and multiply by 2? If so, could you show it.
March 22, 2012

Calculus
Rectangle side is represented by (2,3) and (-6,4). Find the perimeter of rectangle. Could someone please help~
March 22, 2012

Calculus and vectors
Could someone explain to me how I can find the area/perimeter/volume of a rectangular prism if I am given R^3 points. For example find area of rectangular prism given pts (2,3,4)(5,3,2), similar to this.
March 21, 2012

Calculus and vectors
Bob can swim at a rate of 5km/h. He is in a river that is flowing at a rate of 9 km/h. a) if bob swims upstream, what is his relative velocity to the ground? b)if bob swims downstream, what is his relative velocity to the ground? c) Someone decides to help Bob out of the water...
March 20, 2012

physics
Bob can swim at a rate of 5km/h. He is in a river that is flowing at a rate of 9 km/h. a) if bob swims upstream, what is his relative velocity to the ground? b)if bob swims downstream, what is his relative velocity to the ground? c) Someone decides to help Bob out of the water...
March 19, 2012

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