Thursday
November 27, 2014

Posts by Confused


Total # Posts: 301

Act Question
all distances are in feet and all are right angles. a straight line drawn from point w to point z would be how long in feet?
January 7, 2012

business
For this question, use the information for Sports Baseballs, Inc. Sports Baseballs, Inc. is a corporation that manufacturers and sells baseballs across several states in the Southeast. It had sales of $2.7 million during the last year. Expenses were as follows: Cost of goods ...
January 7, 2012

Math
how can you break apart arrays when you multiply by 3?
January 5, 2012

chemistry
If you filled three balloons with eaqual volumes of hydrogen, argon, and carbon dioxide gas all at the same temperature and pressure, which ballon would weigh the most? The least?
December 13, 2011

chemistry
What mass of hydrogen peroxide should result when 1.50g of barium peroxide is reacted with 25.0mL of 0.50 M hydrochloric acid?
December 13, 2011

chemistry
a better understanding of how she got the answer
December 13, 2011

chemistry
Jenny please show me in better detail the set up of the answer.
December 13, 2011

chemistry
If you make a solution by dissolving 25.0g of sodium chloride in 100.0 mL of water. What is the boiling point of the solution?
December 13, 2011

math
A woman is sitting in a boat at anchor on a lake. Her boat bobs up and down once every 2.0·s. She notices that when the front of her 3.0·m long boat is at one wave crest, a second crest is at the middle of her boat, and a third is at the end. What is the ...
December 8, 2011

science
Observed under magenta colored lights, you see a crayon that appears red. What colors could the crayon be when observed under ordinary white lights? _____cyan ____magenta ____green ____yellow ____red ___black ___white ____blue
December 8, 2011

chemistry
A 30.0 mL sample of phosphoric acid is titrated with 18.0 mL of 3.0 M NaOH solution. What is the molarity of the phosphoric acid?
December 7, 2011

PHYSICS HELP MEEE SO CONFUSED
oops its 1 kg
December 5, 2011

PHYSICS HELP MEEE SO CONFUSED
Liam fires a bullet into a block suspended by two cables, embedding the bullet in the block. The mass of the bullet is 5g and the mass of the block is 1g. 1) If the maximum height of the block is ,h, is 35 cm, how fast was the bullet originally moving? (can you explain the ...
December 5, 2011

Calculus
I need help finding the derivative of this function: f(x)=(X^2+2)^4/5 Thanks in advance! Any help would be greatly appreciated!
November 20, 2011

Grade 12- Advanced Funtions
what about this question: Determine the roots algebraically by factoring. a) x^3-8x^2-3x+90=0
October 13, 2011

Grade 12 Advanced Functions
what about this question: Determine the roots algebraically by factoring. a) x^3-8x^2-3x+90=0
October 13, 2011

math
How to do polynaimals in 5th grade in the easyest form. How do you do problems like X+6=10 using all the steps instead of just Oh i now its 4
September 28, 2011

Math
I have posted the question again.. sorry it was "using L and w" A printed page is to have a total area of 100 square inches. The top and bottom margins are to be 1 inch and the side margins to be 1.5 inches. Let l represent the total length of the page and w ...
September 27, 2011

Math
A printed page is to have a total area of 100 square inches. The top and bottom margins are to be 1 inch and the side margins to be 1.5 inches. Let l represent the total length of the page and w represent the total width of the page. a) Write an equation, using and , to ...
September 27, 2011

Math
A printed page is to have a total area of 100 square inches. The top and bottom margins are to be 1 inch and the side margins to be 1.5 inches. Let l represent the total length of the page and w represent the total width of the page. a) Write an equation, using and , to ...
September 27, 2011

Calculus
How would you factor this? f(x)=x^3-2x^2-4x-4
September 6, 2011

Epidemiology
Identify the study design best described by the scenarios or research questions presented below. Provide a two-sentence rationale for your answer. Choose from: • Ecologic • Cross-sectional • Case-control • Retrospective (Historical) Cohort • ...
August 8, 2011

health
like u ate at 12 so when can you eat tuna next
June 20, 2011

health
when can you eat tuna after you ate egg?
June 20, 2011

physics
Thanks, my book provides the answer as 21.2 m/sec, I calculated the vertical component 28sin37=16.85 but since it did not match the correct answer I thought I needed another step. There has to be because your answer isn't even a choice.
June 11, 2011

physics
Determine the vertical component of a baseball's velocity if the ball is thrown at 28 m/sec at an angle of 37 degrees with the horizontal. The answer is 21.2 m/sec but I have no clue on how to solve this problem.
June 11, 2011

Statistics
please help
May 5, 2011

Statistics
jenny is 5'10" tall. the heights of the girls in the school are approximately normally distributed with a mean of 5'5" and a standard deviation of 2.6". What is the percentile of jenny's height?
May 5, 2011

calculus
The function f is twice differentiable, and the graph of f has no points of inflection. If f(6)+3, f'(6)=-1/2, and f"(6)=-2, which of th following could be the value of f(7). A.)2 B.)2.5 C.)2.9 D.)3 E.)4 the answer is A. but what are the steps to reach this answer?
April 26, 2011

calculus
The sides and diagonal of the rectangle above are strictly increasing with time. At the instant when x=4 and y=3, dx/dt=dz/dt and dy/dt=k(dz/dt). What is the value of k at that instant. solved for z with pythagorean theorem and stuck at that step. z=5
April 26, 2011

statistics
A professor knows that in her class 37% of the students have passed an Algebra course, 29% have passed an English course, and 21% have passed both courses. If one student is selected at random from this class, find the probability that: c) the student did not pass algebra.
April 24, 2011

math
A professor knows that in her class 37% of the students have passed an Algebra course, 29% have passed an English course, and 21% have passed both courses. If one student is selected at random from this class, find the probability that:
April 24, 2011

statistics
a) are the outcomes on the two cards independent? why? b) find P(3 on 1st card and 10 on 2nd) c) find P(10 on 1st card and 3 on 2nd) d) find the probability of drawing a 10 and a 3 in either order.
April 15, 2011

statistics
you draw two cards from a standard deck of 52 cards, but before you draw the second card, you put the first one back and reshuffle the deck.
April 15, 2011

vectors and physics
A 40 kg weight is suspended at P which is held up By the ropes PQ and PR the ropes make angles at 160 degrees and 130 degrees respectively with the vertical, find the tension in the ropes
April 13, 2011

algebra
How to solve for the unknown: 2/3/10 = 1.8/r
April 12, 2011

biology
if a man is a hetero zygote for a trait but the woman is homozygous recessive, what are the chances that their children will be homozygous dominant
April 11, 2011

algebra
(2x(tothe2ndpower)-3x+4)-(3x(tothe2ndpower)-x+2= ????
February 4, 2011

math (perimeter)
i need to find the perimeter of a triangle with the demensions : 2(q^2-3q) , q+10 , and q^2 .
January 23, 2011

physics
A particle travels horizontally between two parallel walls separated by 18.4m. It moves towards the opposing wall at a constant rate of 7.2m/s. Also, it has an acceleration in the direction parallel to the walls of 2 m/s^2. a) What will its speed be when it hits the wall? b) ...
December 29, 2010

physics
THANK YOU!!!
December 29, 2010

computers
What ideas can you propose for the future of processor design? What do you think the limit of clock speed for a processor will be? How could a CPU communicate more quickly with memory? What could future cache designs look like? I've been looking in Google search, Google ...
December 13, 2010

math(trig)
1) What's the linear velocity of a point on the tip of a 6-ft propeller turning at 1200 revolutions per min? 2) A gear is driven by a chain that travels 90m/min. Find the radius of the gear if it makes 50 revolutions per minute.
December 6, 2010

math(trig)
1) A 6-ft propeller turns at 1200 revolutions per minute. Compare the angular velocity of the tip with the angular velocity at a point 10 in. from its center. 2) What is the angular velocity of a point on the tread of a 15-in. diameter tire on a car traveling 55 mph?
December 6, 2010

Chemistry Cell notations
also shouldn't it be the coefficient of H^+ in the second equation be 14?
December 2, 2010

Chemistry Cell notations
Okay so the problem I had with this is like...I did't understand that when it was written say on the left of the double vertical line how you know H2O --> O2 + H+ will it always be written in the order of how you write the reaction? or like could you also right it like ...
December 2, 2010

Chemistry Cell notations
Enter the balanced chemical equation including states that describes the electrochemical cell that is represented by the cell notation as shown. Pt(s) l H2O(l) l O2(g) l H+(aq) ll H+(aq), Cr2O72-(aq), Cr3+(aq) l Pt(s)
December 2, 2010

math
The 2 pulleys in the figure have radii of 15 cm and 8 cm, respectively. The larger pulley rotates 25 times in 36 seconds find the angular velocity of each pulley in radians per second. Find angular velocity of each pulley in radians per second.
December 2, 2010

math
find v for the following question.. the tip of the airplane propeller 3m long, rotating 500 times per minute (hint r=1.5m)
December 2, 2010

chemistry half reactions
How do i solve this half reaction with Mg(OH)2(s) --> Mg(s)? Complete and balance the displayed half reaction in basic aqueous solution taking into account the electrons. Mg(OH)2(s) → Mg(s)
November 23, 2010

physics
Sprinting near the end of a race, a runner with a mass of 70 kg accelerates from a speed of 6 m/s to a speed of 9 m/s in 2 s. (a) What is the runner's average acceleration during this time? (b) To gain speed the runner produces a backward force on the ground, so that the ...
November 22, 2010

physics
1. How much acceleration does a 747 jumbo jet of mass 31600 kg experience in takeoff when the thrust for each of four engines is 30000 N? 2. Two boxes are seen to accelerate at the same rate when a force F is applied to the first and 5F is applied to second. What is the mass ...
November 22, 2010

Physics
A bullet of mass 5.15 g is fired horizontally into a 2.74 kg wooden block at rest on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.185. The bullet comes to rest in the block, which moves 1.84 m. (a) What is the speed of the block ...
November 21, 2010

physics
What is the acceleration of a 23 kg pail of cement that is pulled upward (not sideways!) with a force of 300 N?
November 21, 2010

chemistry
If 0.0490 mol of solid CaCO3 and 380 mL of 0.135 M aqueous H2SO4 are reacted, what volume (L) of gaseous CO2 measured at 1.1 atm pressure and 301 K is produced. H2SO4(aq) + CaCO3(s) → CO2(g) + CaSO4(s) + H2O(l)
November 21, 2010

Limiting reagent
If 270. mL of 0.08089 M aqueous Pb(NO3)2 and 710. mL of 0.05493 M aqueous Na+ are reacted stoichiometrically according to the equation, what mass (g) of Na+ remained? Pb(NO3)2(aq) + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq)
November 21, 2010

Reaction rates
oooh, righteous! Thanks so much I appreciate the time you take out to help!
November 20, 2010

Reaction rates
so... k=Ae^(Ea/RT) Do I set it up as ratios? I.e. 0.0000100s-1=Ae^(-Ea/R * 636) ____________________________ 0.000479s-1=Ae^(-Ea/R * 700) A cancels out ...and then solve from there?
November 20, 2010

Reaction rates
The reaction, C2H5Br --> C2H4 + HBr, has a rate constant k = 0.0000100 s-1 at 363 °C and k = 0.000479 s-1 at 427 °C. What is the rate constant for the reaction at 725 K? Round your answer to 3 significant figures.
November 20, 2010

Concentration and Reaction
The rate of the following reaction: Radioactive decay of 90Sr, is characterized by the rate constant k = 0.024 year-1. What is the half-life (in years) for this reaction at the same conditions when the initial concentrations are 0.0356 M? (Round your answer to 3 significant ...
November 20, 2010

chemistry
What is the rate of the following reaction (M/s) if the rate constant for the reaction is 0.500 L•mol-1•s-1 and the concentration of each reactant is 0.0628 M. (The units for the rate constant depend upon the rate law). CO + NO2 --> CO2 + NO
November 20, 2010

social studies
How do elections in a single-member district differ from elections in states that fill their seats at-large?
November 20, 2010

chemistry
If 380. mL of 0.4294 M aqueous CaBr2 and 250. mL of 0.5880 M aqueous SO42- are reacted stoichiometrically according to the equation, how many mol of CaBr2 remained? Al2(SO4)3(aq) + 3 CaBr2(aq) → 2 AlBr3(aq) + 3 CaSO4(s) ----------------------------------------- If 270. ...
November 17, 2010

BIOLOGY GR.12
What are the differnt conditions for yest fermentation. i have to make a hypothesis and experment based on yeast fermentation. I WANT TO KNOW WHAT EFFECTS THE FERMENTATION. for example using a higher temp to put my yeast in will make the fermentation faster. WHAT OTHER FACTORS...
October 20, 2010

chemistry
Also other information Answer they gave: 0.000148571182 Molsr Mass: PbSO4 303.26
October 16, 2010

chemistry
What about this question? Calculate the mass (g) of PbSO4 that will dissolve in 2000 mL of 0.0694 M K2SO4 solution. The equation represents the solubility process. PbSO4 (s) Pb2+ (aq) + SO42- (aq) Ksp = 1.7 x 10-8
October 16, 2010

chemistry
the standard state free energy of hydrolysis of acetyl phosphat is G= -42.3 kJ/mol. Calculate the free energy change for the acetyl phosphate hydrolysis in a solution of 2mM acetate, 2 mM phospate and 3 nM acetyl phospahte.
October 6, 2010

Chemistry
An enzymatic hydrolysis of fructose was allowed to proceed to equilibrium at 25 degrees C. The original concentration of fructose-1-p was .2 M, but when the system had reached equlibrium the concentration of fructose 1-p was only 6.52 * 10 -5 M. Calculate the equilibrium ...
October 6, 2010

physics
If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? answer in m/s.
October 6, 2010

physics
If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? Answer in m/s.
October 5, 2010

physics
I think it's the wrong answer because I plugged it in and it was still marked wrong.
October 5, 2010

physics
What is the acceleration of a vehicle that changes its velocity from 120 km/h to a dead stop in 7 s? Answer in km/h·s
October 5, 2010

Statistics
P(10 on 1st card and 3 on 2nd)
September 26, 2010

math
find the other endpoint (x,11) of a segment given the endpoint (5,-4) and a distance of 17.
September 21, 2010

math
find the domain & range of each relation & identify any relations that define functions y=3(x+1)^2-5
September 15, 2010

physics
Bertrand Russell wrote, "I think we must retain the belief that scientific knowledge is one of the glories of man. I will not maintain that knowledge can never do harm. I think such general propositions can almost always be refuted by well-chosen examples. What I will ...
September 12, 2010

physics
1. What is a typical drift speed of electrons that make up a current in a typical DC circuit? (zero, less than 1 cm/s, about 10 m/s, or the speed of light) 2. What is the typical drift speed in a typical AC circuit? (zero, less than 1 cm/s, about 10 m/s, or the speed of light)
July 16, 2010

physics
1. If the voltage impressed across a circuit is constant but the resistance increases by a factor of 15. By what factor does the current change? 2. If the resistance of a circuit remains constant while the voltage across the circuit decreases by a factor of 12, by what factor ...
July 16, 2010

physics
1. How much does it cost to operate a 75 W lamp continuously for 1 week if the power utility rate is 7/kWh?
July 16, 2010

physics
1. (a) How far below an initial straight-line path will a projectile fall in eight seconds? (b) Does your answer depend on the angle of launch or on the initial speed of the projectile? the answer is no. but defend it. 2. Why is it important that a satellite be above Earth'...
July 13, 2010

physics
1. What did Newton conclude about the force that pulls apples to the ground and the force that holds the moon in orbit? 2. What does the very small value of the gravitational constant G (in standard units) tell us about the strength of gravitational forces? 3. We can think of ...
July 13, 2010

physics
1. If our sun shrank in size to become a black hole, using the gravitational force equation, explain why the Earth's orbit would not be affected. 2. Strictly speaking, you weigh a tiny bit less when you are in the lobby of a massive skyscraper than you do at home. Why is ...
July 13, 2010

physics
1)A toy train is initially at rest on a track fastened to a bicycle wheel, which is free to rotate. How does the wheel respond when the train moves clockwise? When the train backs up? Does the angular momentum of the wheel-train system change during these maneuvers? How would ...
July 9, 2010

Finance
How long would it take to accumulate $2,000,000 at a rate of 5% with the starting amount of $1,150,
May 31, 2010

chemistry
What about this question? Calculate the mass (g) of PbSO4 that will dissolve in 2000 mL of 0.0694 M K2SO4 solution. The equation represents the solubility process. PbSO4 (s) Pb2+ (aq) + SO42- (aq) Ksp = 1.7 x 10-8
May 13, 2010

chemistry
i'm still lost can you show me step by step please
April 26, 2010

chemistry
a 10.0mL vinegar sample was completely neutralized by 22.5mL 0.2M NaOH solution. calculate molarity and % of acetic acid in vinegar. please help
April 26, 2010

chemistry
what does it mean when it says the percentage of the original N2O4 that is dissociated.
April 14, 2010

chemistry
Kc=5.85x10^-3 at 25 degrees C for the reaction N2O4(g)<-->2NO2(g) fifteen(15.0) grams of N2O4 is confined in a 5.00-L flask at 25 degrees C. Calculate(a) the number of moles of NO2 present at equilibrium and(b) the percentage of the original N2O4 that is dissociated.
April 14, 2010

help plz
c. progress....the other 3 are complete antonyms
April 14, 2010

math
In Quadratics Grade Ten:How do you find the coordinates of the vertex? What is the Optimum value mean? What are the zeros of the relation? How do you know if the parbola is Maximum or Minimum?
March 26, 2010

Chemistry
ok the answer i got now was 50 degrees celcius
March 2, 2010

Chemistry
i keep getting 32.3005 for T, if you have worked it out did you use 8.314472 for R, also is -126kj/mol -12600j/mol?
March 2, 2010

Chemistry
The aquation of tris(1, 10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)3^2+ + 3H3O + 3H2O==> (Fe(H2O)6^2+ + 3 phenH^+ If the activation energy is 126 kJ/mol and frequency factor is 8.62 x 1017 s-1, at what temperature is the rate ...
March 2, 2010

Chemistry
i dont understand where k1 k2 t1 t2 come from... :(
March 1, 2010

Physics
doesnt vq = - work ?...signs are important since work = -u, and u = vq
February 24, 2010

Math for teaching.
I need help finding examples of discrete models used in addition. Can you explain this to me or show me a cite that might help. Thanks
February 15, 2010

international business
Explain the relation between trade and world output. Describe the broad pattern of international trade. If the nations of the world were to suddenly cut off all trade with one another, what products might you no longer be able to obtain in your country? Choose one other ...
January 16, 2010

math
complete the table fraction decimal percent 95% .80 3/9 6/8 66 2/3%
December 15, 2009

New Prague
My son brought home this problem... Make a set of at least 12 numbers that have the following landmarks. minimum: 3 maximum: 9 median: 7 mode: 7 someone please help!
December 15, 2009

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