Thursday
July 28, 2016

Posts by DAVID

Total # Posts: 2,056

maths
The function f is such that f(x)= (2 - x)^2, x belongs to real number. Find g and h as functions of x such that gh(x)=f(x)
July 27, 2016

computer ( theory )
A designer wishes to include some multimedia components on a web page. a) If the designer has some images stored in files, there are two possible formats for the files.. i) Describe the approach used if a graphic is stored in a vector graphic file ii) Describe the approach ...
July 16, 2016

CHEMISTRY
I didn't understand the mass M2CO3 titrated = 7.46 x (25/1000) step. please, could you explain
July 9, 2016

CHEMISTRY
A solution of a metal carbonate M2CO3, was prepared by dissolving 7.46 g of the anhydrous solid in water to give 1000cm^3 of solution. 25.0cm^3 of this solution reacted with 27.0cm^3 of 0.100 mol/dm^3 hydrochloric acid. Calculate the relative formula mass of M2CO3 and hence ...
July 9, 2016

Organic Chemistry
Suppose 5.00 gram of a mixture of aspirin, caffeine, and acetanilide was dissolved in enough solvent (methylene chloride) to make a total of 100.00 mL volume. You took 10.00 mL from it and isolated its components using the same protocol you did in the lab. You obtained: ...
June 27, 2016

Geometry
If the width and height of a rectangular prism are each shrunk to one seventh of the original size but the length remains the same, what is the formula to find the modified surface area?
June 20, 2016

math
Find the smallest positive integer not relatively prime to 2015 that has the same number of positive divisors as 2015.
June 19, 2016

math
If I am traveling at 60mph and you are traveling at 30mph how many minutes until we meet?
June 10, 2016

math
Marta’s math textbook weighs mc017-1.jpg of a pound less than 4 times the weight of the book she is reading for her language arts class. If the weight of the math textbook is mc017-2.jpg pounds, which shows the correct equation and value of x, the weight of Marta’s ...
June 10, 2016

Parametric Equations
For the set of parametric equations x = 2t+1 and y = t^2-5, name the initial point on the graph on the interval -5<t<5. a. (-9, -30) b. ( -5, 5) c. (11, 20) d. (-9, 20) (I chose this one)
June 9, 2016

Math
What must be true about the solution to this system of equations? x+4y+9z = -96 -2y+9z = -47 z = -7 a) The solution will describe the intersection point(s) of the 3 graphs. b) The value of z must be -7. c) The solutions will have values for x, y, and z. d) All of the above ...
June 9, 2016

math
A rectangle has a width of 15 inches and a diagonal of 17 inches. Find the length of the rectangle in inches. 15^2 + b^2 = 17^2 225 = b^2 = 289 0 + b^2 = 289 – 225 B^2 = 64 B = SQRT of 64 = 8 The length of the rectangle in inches equals 8 inches.
June 8, 2016

math
A suitcase measures 22 inches long and 16 inches high. What is the diagonal length of the suitcase to the nearest foot. 16^2 + 22^2 = C^2 256 + 484 = C^2 740 = C^2 SQRT of 740 = 27.20 in. The diagonal length to the nearest foot equals 2.26ft.
June 8, 2016

math
A suitcase measures 22 inches long and 16 inches high. What is the diagonal length of the suitcase to the nearest foot. 16^2 + 22^2 = C^2 256 + 484 = C^2 740 = C^2 SQRT of 740 = 27.20 in. The diagonal length to the nearest foot equals 2.26ft.
June 8, 2016

Math
A hat contains 3 ​marbles; one green​, one blue​, and one orange. Two marbles are selected at random without replacement from the hat. ​a) Determine the number of points in the sample space. ​b) Determine the probability of selecting exactly 1 ...
June 5, 2016

My brain is hurting please help?
At a​ homeowners' association​ meeting, a board member can vote yes or on a motion. There are three motions on which each board member must vote. Complete parts ​(​a) through ​(c) below. ​(a) Determine the number of points in the sample ...
June 5, 2016

Math
Find the indicated probability. If​ P(A or ​B)equals=0.7 ​P(A)equals=0.3 and​ P(A and ​B)equals=0.15 find​ P(B). ​P(B)equals=
June 5, 2016

Science
Why are boats more efficient than airplanes? They use less fossil fuels to move
June 4, 2016

Math
One thousand raffle tickets are sold for 1 dollar each, one prize of 800.00 dollars is to be awarded. Rene Condos purchases one ticket a) Determine her expected value? b) Determine the fair price of a ticket?
June 3, 2016

Prosbility
One thousand raffle tickets are sold for 1 dollar each. One price of 800.is to be awarded. Rena Condos purchases one ticket? Determine her expected value Determine the fair price of the ticket 1/800 1 dollar
June 2, 2016

Physics
8kg mass moving with a speed of 30 of 30ms-1 is brought to rest in 2.5sec, calculate the magnitude of the constant retarding force
June 1, 2016

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

Geometry
Find the volume of the large solid without the smaller solid. The solid is a right solid and is not drawn to scale. Round answers to the tenths place.
May 2, 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

History
The answer is dessert
April 26, 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

History
Thx MS. SUE
March 16, 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

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