Wednesday
June 1, 2016

Posts by david

Total # Posts: 2,029

algebra 1
NEED HELP!!Hi, I have been trying to figure this one math problem for awhile and I am stuck. I believe the answer is between A or B. Skip is practicing tennis serves against a wall. The distance between Skip and the tennis ball, in feet, at any time T, measured in seconds, is ...
May 30, 2016

Algebra
The Connecticut River flows at a rate of 3 km / hour for the length of a popular scenic route. If a cruiser to travels 3 hours with the current to reach a drop-off point, but the return trip against the same current took 7 hours. Find the speed of the boat without a current?
May 24, 2016

math
-5 + (x/-3) = 28
May 20, 2016

Math
Find the limit if it exists. lim 1/(x-2) = infinity x→2+ lim 1/(x-2) = negative infinity x→2- lim 1/(x-2) = Does not exist x→2 lim (3x+2) = infinity x→∞ lim 999/(x^3) = 0 x→-∞ Can someone check to make sure that I am correct?
May 19, 2016

Math
Find the limit if it exists. lim 1/(x-2) x→2+ lim 1/(x-2) x→2- lim 1/(x-2) x→2 lim (3x+2) x→∞ lim 999/(x^3) x→-∞
May 19, 2016

Math
Find the limit if it exists. lim 1/(x-2) x→2+ lim 1/(x-2) x→2- lim 1/(x-2) x→2 lim (3x+2) x→∞ lim 999/(x^3) x→-∞
May 19, 2016

Math
Ellie has 200 dollars in her wallet at 10:00 AM when she goes to the mall. Afterwards, at 4 PM she has only 5 dollars left. Is it possible that Ellie had exactly 100 dollars at one point? Explain. My guess to this question would be yes and I would use the Intermediate Value ...
May 19, 2016

Math
f(x) = 2x^2 x<2 4x x≥2 1. Find the slope of the tangent curve of 2x^2 at x=2. a. -1/2 b. 1/2 c. 4 d. 8 e. Does not exist 2. Find the slope of the tangent curve of 4x at x=2. a. -1/2 b. 1/2 c. 4 d. 8 e. Does not exist 3. Find the slope of the tangent curve of f(x) at x...
May 19, 2016

Math
5x - 3 = 7x + 11 x=-4 3w -4 = w+8 w =6 Please check. Thanks
May 15, 2016

philosophy
Why are philosophical questions not answered with facts?
May 13, 2016

english
a letter to your uncle in american asking him to help you pay your school fees for this term.
May 9, 2016

Chemistry
The reaction of methyl-benzene with HNO3 in the presence of catalyst will provide what main compound?
May 9, 2016

math
The radius of a circle in increasing at the rate of 0.5cm/s. Find the rate at which the circumference increases if the radius in 5cm.
May 8, 2016

Calculus
A bucket begins weighing 30 pounds, including the sand it holds. The bucket is to be lifted to the top of a 25 foot tall building by a rope of negligible weight. However, the bucket has a hole in it, and leaks 0.1 pounds of sand each foot it is lifted. Find the work done ...
May 6, 2016

chemistry
1 mole ----> 24 g ? mole -----> 0.12 moles ( Mg ) = 0.12 / 24 = 0.005 moles of Mg
May 5, 2016

Chemistry
DrBobb22 Calcule the concentrations of Cd^+2 , [Cd(CN)4^-2] and CN^- at equilibrium, when 0.42 moles of Cd(NO3)2 dissolves in 1 L of 2.50 M NaCN Kf for Cd(CN)4^-2 is 7.1x10^16
May 5, 2016

Chemistry
I will post again ok?
May 5, 2016

Chemistry
Kf is 7.1 x 10^16
May 5, 2016

Chemistry
DrBobb22 Calcule the concentrations of Cd^+2 , [Cd(CN)4^-2] and CN^- at equilibrium, when 0.42 moles of Cd(NO3)2 dissolves in 1 L of 2.50 M NaCN Kf for Cd(CN)4^-2 Help!
May 5, 2016

Chemistry
Calculate the concentrations of Cd+2 , Cd(CN)4^-2 and CN at equilibrium when dissolvs 0.42 moles of Cd(NO3)2 (2.50 mol/L) Kf for Cd(NO3)2 = 7,1x10^16.
May 5, 2016

Chemistry
What volume in ml of 0.500 M silver nitrate is required to completely react with 25.0 ml of 1.5 M calcium chloride?
May 5, 2016

Math
f(x) = cos (1/x) Find the limit as x approaches infinity and find the limit as x approaches negative infinity. Identify all horizontal asymptotes.
May 4, 2016

Math
f(x) = cos (1/x) Find the limit as x approaches infinity and find the limit as x approaches negative infinity. Identify all horizontal asymptotes.
May 4, 2016

mathematics for accounting
the question is the formula use in calculating depreciation that is reducing balance method which is (1-n√s/c)×100/1 now we were asked to now make each of n,s,and c in the formula the subject of the formula
May 4, 2016

math
make each of the following the subject of the formula n,s,c in (1-n√s/c)*100/1
May 4, 2016

Math
f(x) = tan x / sin x Find the vertical asymptote. Describe its behavior to the left and right of the vertical asymptote.
May 3, 2016

Chemistry
This is the correct one because you simply just have to do a double replacement reaction. H3PO4 + 3KOH -> K3PO4 + 3 H2O
May 3, 2016

Chemistry
This is the correct one because you simply just have to do a double replacement reaction. H3PO4 + 3KOH -> K3PO4 + 3 H2O
May 3, 2016

Quantitative Chemistry
(H: +1, Cl: -1) (Mn: +4, O: -2) --> (Mn: +2, Cl: -1) (H: +1, O: -2) (Cl: 0) So, as you can see the Manganese atoms are clearly being reduced which means that it is gaining electrons, so the charge goes down. You can now eliminate choice A. Next, we can see that the charge ...
May 3, 2016

Math
Thanks sir
April 30, 2016

Math
A bucket begins weighing 15 pounds, including the sand it holds. The bucket is to be lifted to the top of a 50 foot tall building by a rope of negligible weight. However, the bucket has a hole in it, and leaks 0.1 pounds of sand each foot it is lifted. Find the work done ...
April 30, 2016

Math
Thanks Damon!
April 30, 2016

Math
kinematics look easier i can do both ways but will they have different values
April 30, 2016

Math
its calculus but will kinetatic equations work as well?
April 30, 2016

Chemistry
Consider the reaction: K2S(aq)+Co(NO3)2(aq)=2KNO3(aq)+CoS(s) what volume of 0.255 M K2S solution is required to completely react with 160 mL of 0.130 M Co(NO3)2?
April 29, 2016

Chemistry
Thanks!!!
April 29, 2016

Calculus 2
Suppose that a spring has a natural length of 25 ​cm, and that 8 J of work is needed to stretch from a length of 50 cm to 80 cm. How far beyond its natural length will a force of 32 N keep the spring​ stretched? **I've tried calculating the spring constant ...
April 25, 2016

Government
Why people who represents special interest group received the name lobbyist ?
April 25, 2016

Programming
I am having a problem with something. i nead to assing values to parameters from input.dat file without using fscanf. i need to use the terminal like a.out<input.dat>output.out i have a file like this GEN 0.0 2.1351 0.00001 500 o PEND 0.12 0.1 0.15 0.5 0 0.16 0.11 0.8 -0...
April 24, 2016

algebra 2
Write (21 − 4i) − (16 + 7i) + 28i as a complex number in standard form.
April 21, 2016

Chemistry
[2.0 mol (-285.91 kJ/mol)] + [1.0 mole (0 kJ/mol)] - [1.0 mole (50.61 kJ/mol)] = ??? I came up with the awnser of -622.43 but im not sure what the correct amount of significant figures would be and why? would 0 kj/mol be considered significant making the answer -600? what ...
April 17, 2016

have got a question@sir-damon
so how can i get the total
April 17, 2016

maths help plz
A certain number of children are arranged in a circular form,if they are evenly spaced,the 7th child is directly opposite to the 8th child.... how many children are their altogether? thanks
April 17, 2016

History
Why is the Franco-Prussian War considered an important development in the history of Europe? It was at this time that France reclaimed its military dominance in Europe. It was because of this war that Germany began its military dominance in Europe. The war allowed Prussia to ...
April 16, 2016

History
Use the following statement by Robert Owen to answer the question below: "...but I know that society may be formed so as to exist without crime, without poverty, with health greatly improved, with little if any misery, and with intelligence and happiness increased a ...
April 16, 2016

Chemistry
Thank you @DrBob222
April 15, 2016

Chemistry
Which is more soluble in water, Cl2 or I2?
April 15, 2016

Chemisty
Well I asked about using phenolphthalein and my teacher said that it was not a good idea. But when I was looking online, I saw some experiments using the amount of gas produced to find the amount of acetic acid in a 20Ml of vinegar in g/ml If you could tell me how this this ...
April 7, 2016

Chemisty
I was told to find the concentration of acetic acid in vinegar when only using baking soda and common lab equipment. Can someone tell me how Thanks
April 7, 2016

maths help me urgently!!!!!!
rationalise [1-(2i^2)]/i Plz help show we working so that i can learn
April 7, 2016

Physics 1
A textbook of mass 1.95 kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.100 m , to a hanging book with mass 3.08 kg . The system is released from rest, and the books are observed to move a distance 1.27 m ...
April 6, 2016

maths polynomial help!!!!
x^2+2x+1 is a factor of ax^3+ax^2+bx+c then find a b c help!!
April 6, 2016

physics
Use conservation of energy to determine the angular speed of the spool shown in the figure below after the 3.00 kg bucket has fallen 4.05 m, starting from rest. The light string attached to the bucket is wrapped around the spool and does not slip as it unwinds. the spool, ...
April 6, 2016

physics
A ball bounces to 34 percent of its original height. *1) What fraction of its mechanical energy is lost each time it bounces? *2) What is the coefficient of restitution of the ball-floor system? - I was able to solve part one and get an answer of .66, but part two I don't ...
April 5, 2016

physics
i've tried that and it was incorrect. thanks for trying
April 5, 2016

physics
A ball bounces to 34 percent of its original height. *1) What fraction of its mechanical energy is lost each time it bounces? *2) What is the coefficient of restitution of the ball-floor system? - I was able to solve part one and get an answer of .66, but part two I don't ...
April 5, 2016

trigonomentry out of ideal help ah!crying
compute.. Cos(1degree)+cos(3degree)+cos(5degree)+...+Cos(179degree) plz show working even an hint can,t help me.Have been do maths alday my brain is fried..Ah thanks
April 1, 2016

MAth
Lily and rose are playing a game, in the game,each player starts with 0 points and the player with the most points at the end win. Lily gains 5 points two times loses 12 points ,and then gains 3 points. Rose loses 3 points two times,loses 1point,gains6 points another gains7 ...
March 31, 2016

math
I got it now. 13 combination 1. Thanks
March 31, 2016

math
@steve, Please I'm not clear with what you mean by 13C1. Thanks
March 31, 2016

math
Assuming you are listening to your favorite playlist that has 83 country songs, but your mom also added 9 pop. Suppose that shuffle mode is on - a song played is being selected at random (with replacement) from the playlist. Find the probability that, out of the next 13 songs...
March 31, 2016

physics steve or damon help!!!!
A stone is thrown horizontally from the top of a vertical wall with a velocity of 15m/s hit the horizontal ground at a point 45m from the base of the wall.calculate the height of the wall g=10
March 28, 2016

physics
Two equally long 12-cm diameter pipelines have the same pressure difference between ends. One carries a ‘Type A’ oil (𝜂 = 0.091 Pa s) and the other a ‘Type B’ oil (𝜂 = 0.064 Pa s). If ‘Type A’ oil flows at 0.14 m3/s, at which rate ...
March 26, 2016

Physics
A material is formed into a long rod with a square cross section 0.31 cm on each side. When a 100 V voltage is applied across a 16 m length of the rod, a 4.6 A current is carried. What is the resistivity of the material? This is a rectangular wire rather than a cylindrical. I ...
March 24, 2016

maths geomentry help!!!
the area of a sector PQR is a @rad.and the radius of the of the circle is rcm,the area of the sector is 20cm^2 and the perimeter is 26cm.find r?
March 22, 2016

integration!!help urgently
what the meaning of that box
March 21, 2016

integration!!help urgently
integrate:dz/(z^2+1) where z is a complex number.....plz working
March 21, 2016

Discrete Math Help
1) How would I prove that (n - 1 + 2 C 2) = n + (n C 2) 2) A cafeteria offers 17 types of pizza and 5 types of soda. Bob goes there everyday for lunch, always buying two slices of pizza and one soda. However, he never gets exactly the same thing on two consecutive days (that ...
March 20, 2016

Math
Determine the (binomial) coefficient. (x^2+3)^12; ax^8 I got 12C8 * (x^2)^4 * (3)^4 which is 40,095*x^16 but my teacher said it was incorrect. A similar problem to it was (x+3)^12; ax^5 where I determined the answer to be 1,732,105*x^5 which was correct.
March 17, 2016

phi 103
Identify the form of the following argument. Either the Pacers or the Kings will win tonight. The Pacers will win. Therefore, the Kings will not win. a. not a valid form b. disjunctive syllogism c. modus ponens d. hypothetical syllogism e. modus tollens
March 12, 2016

Physics 1
A 50 kg cannonball hits a war tank vehicle of 12,000 kg that is initially at rest. The cannonball embeds in the tank and both move at the same velocity for 50 cm until they both come to a rest. What is the initial velocity of the cannonball if the coefficient of friction ...
March 8, 2016

Physics 1
A golf ball of mass 125 g hits a billiards ball of mass 172.5 g that is initially at rest. After the collision, the golf ball moves to the right at a speed of 10 cm/s. The billiards ball moves to the left with a speed of 58 cm/s. (a) What was the velocity of the golf ball ...
March 8, 2016

Physics 2
Two boxes are connected by a light string that passes over a light, frictionless pulley. One box rests on a frictionless ramp that rises at 30° above the horizontal (see the Figure below), and the system is released from rest. (a) Which way will the 50kg box move, up the ...
March 4, 2016

Physics
Two boxes are connected by a light string that passes over a light, frictionless pulley. One box rests on a frictionless ramp that rises at 30° above the horizontal (see the Figure below), and the system is released from rest. (a) Which way will the 50kg box move, up the ...
March 4, 2016

Algebra
A car traveled 60% of the way from town A to town B at an average speed of 50 mph. The car travels at an average speed of "S" mph for the remaining part of the trip. The average speed for the entire trip was 45 mph. What is "S"?
March 1, 2016

MATH
A PLOT OF RECTANGULAR LAND HAS A WIDTH OF 20 FEET.THE TOTAL SQUARE YARDS ARE 396.WHAT IS THE LENGTH OF THE PLOT
February 27, 2016

science
a bike weighs 200 n. if it starts from rest and travels 100 m in 5 s undergoing constant acceleration, what net force is causing the acceleration
February 26, 2016

Math
A sidewalk is 40 m long. each section of the sidewalk is 8 dm long. how many sections of sidewalk are there?
February 24, 2016

engineering science
A solid cylinder rolls from rest down an incline 6m high without slipping. calculate the linear velocity at the foot of the plane
February 22, 2016

general physics
A string going over a massless frictionless pulley connects two blocks of masses 5.9 kg and 9.5 kg. the 5.9 kg block lies on a 31 ◦ incline; the coefficient of kinetic friction between the block and the incline is µ = 0.22. The 9.5 kg block is hanging in the air. ...
February 20, 2016

Physics
Thank You this is what i needed
February 16, 2016

Physics
A hoop starts from rest at a height 1.8 m above the base of an inclined plane and rolls down under the influence of gravity. What is the linear speed of the hoop's center of mass just as the hoop leaves the incline and rolls onto a horizontal surface? (Neglect friction.) I...
February 16, 2016

life orientation
Yes
February 13, 2016

General physics
A 4.6 kg object is subjected to two forces, F~1 = (2.8 N)iˆ+(−3.5 N)jˆ and F~2 = (4 N)iˆ+(−11.5 N)jˆ. The object is at rest at the origin at time t = 0.What is the magnitude of the objects acceleration? -i've tried using the equation ...
February 10, 2016

Algebra
Lily sold 18 items at the street fair. She sold bracelets for $6 each and necklaces for $5 each for a total of $101. Which system of equations can be used to find b, the number of bracelets she sold, and n, the number of necklaces she sold?
February 9, 2016

Calculus (double integral) PLEASE HELP!
Evaluate double integral ln((x-y)/(x+y)) dy dx where the double integral region is the triangle with vertices (1,0),(4,3), (4,1). Hint: use a transformation with the Jacobian.
February 8, 2016

Calculus (Jacobian question)
Evaluate double integral ln((x-y)/(x+y)) dy dx where the double integral region is the triangle with vertices (1,0),(4,3), (4,1). Hint: use a transformation with the Jacobian.
February 7, 2016

Calculus
Evaluate double integral ln((x-y)/(x+y)) dy dx where the double integral region is the triangle with vertices (1,0),(4,3), (4,1). Hint: use a transformation with the Jacobian.
February 7, 2016

Math
Thank you! I finally understand!
February 6, 2016

Math
Given the equations y=16 and y=3. Determine the slope and y-intercept if any exist. I have determined that the slope is 0 for both equations because it is a horizontal line, but I don't know what the y-intercepts are?
February 6, 2016

Algebra
Given the equations y=16 and y=3. Determine the slope and y-intercept if any exist. I have determined that the slope is 0 for both equations because it is a horizontal line, but I don't know what the y-intercepts are?
February 6, 2016

Economics
The correct answer should be C. Remember, command economies are related to communism where the government controls everything. So, the government controls the economy, all the land, and they decide what job people get.
February 2, 2016

Math
In Super Bowl I, the Green Bay Packers defeated the Kansas City chiefs by a score of 35 to 10. The total points came from 13 different scoring plays, which were a combination of touchdowns, extra point kicks, and field goals, worth 6, 1, and 3 points respectively.The same ...
February 2, 2016

Math
In Super Bowl I, the Green Bay Packers defeated the Kansas City chiefs by a score of 35 to 10. The total points came from 13 different scoring plays, which were a combination of touchdowns, extra point kicks, and field goals, worth 6, 1, and 3 points respectively.The same ...
February 1, 2016

physics2048
A ball is thrown straight up from the ground with an initial velocity of 43.5 m/s; at the same instant, a ball is dropped from the roof of a building 15.4 m high. After how long will the balls be at the same height? The acceleration of gravity is 10 m/s^2 Answer in units of s...
January 30, 2016

math
Alex scores 1\5 of the teams goals in the playoffs. Of those goals, 1/3 of them were scored during a power play. What fraction of the teams playoff goals were scored by Alex on the power play?
January 22, 2016

Math
Suppose you rent apartments in a large apartment complex. Currently there are 90 apartments being rented at a rent of $1300 per month. Evidence shows that for every increase of $25 per month in rent, there will be 1 additional unit unrented. (a) U is the number of units rented...
January 19, 2016

Science(physics)
1.25N
January 19, 2016

math
a jucket cost £45 in the "15℅ off "sale. how much did it cost before the sale?
January 17, 2016

Math
3/11 eleven up on three.
January 17, 2016

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