Friday
December 9, 2016

Posts by David

Total # Posts: 2,182

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

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
1+1= 001+001=010 =010
January 28, 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

Chemistry 101
13
January 19, 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

chemistry
1 gm of magnesium is burnt in a closed container which contains 2 l of air at ntp containing 21 percent oxygen by volume find limiting reagent, mass of excess reagent left over, mass of mgo produced, number of mg and oh ion formed by dissolving it with water
January 14, 2016

Math
Thank you so much Reiny! I finally understand it!
January 13, 2016

Math
(2+3i)^6 Using Demoirves Theorem. I tried solving it out, but somehow it didn't work for me. (2+3i)^6 r=|z|=square root of 2^2 + 3^2 = square root of 13 z = square root of 13 * (cos____ + isin_______ ) At this point I am stuck, so can someone help me?
January 13, 2016

physicss
Pls be mathematical
January 10, 2016

physicss
Two point charges experience an attractive force of 5N when they are separated by 1m.what force do they experience when their separation is 2m? What is the value of the charges Using coluomb's law F=KQ1Q2/r^2 5=8.99*10^9*Q1*Q2/1
January 10, 2016

university
As=total distance covered/time taken
January 10, 2016

Physics
A long thin rod lies along the x-axis from the origin to x=L, with L= 0.750 m. The mass per unit length, λ (in kg/m) varies according to the equation λ = λ0 (1+1.410x3). The value of λ0 is 0.600 kg/m and x is in meters. 1) Calculate the total mass of the ...
January 9, 2016

Science
Ice at 0 degree celcuis is added to 200g of water initially at 70 degree celcuis in a vacuum flask.When 50g of ice has been added and has all melted the temperature of the flask and contents is 40 degree celcuis.When a further 80g of ice has been added and has all melted the ...
January 8, 2016

Math
Wrong, the answer is C.
January 5, 2016

Math
answer is A
January 5, 2016

Math
2x+1=4x-5 2x=6 x=3 y=2x+1 7=2(3)+1 7=7 The answer would be D.
January 5, 2016

MATH help ty
2x+1=4x-5 2x=6 x=3 y=2x+1 7=2(3)+1 7=7 The answer would be D.
January 5, 2016

Math (Help) thx!
D. No Solution Through the use of elimination the positive and negative 7x would cancel each other out and the positive and negative 15y would also cancel out. You are then left with 0 value so there would be no solution.
January 5, 2016

Trigonomentry help plz thanks
Really, that is inappropriate. I am sorry Collins that I can't help you with this question. I am currently in Pre-Calc so I haven't learned this topic in great detail yet.
January 4, 2016

science
Thank you!
January 4, 2016

science
I am wondering why H2S has only London Dispersion forces and not Hydrogen Bonding?
January 4, 2016

grammar
The sentence structure seems to be a bit weird. The part "also fattens" makes no sense and it doesn't seem like it would belong in this particular sentence. Could you rephrase it? Is this a homework problem?
January 4, 2016

grammar
Is that another question or is it a statement?
January 4, 2016

grammar
I think the correct option would be number 4. "Finishing quickly is not as important as answering all question correctly". Using this word in the sentence would make the most sense. I also recognized an error: the word question should be plural. So, "Finishing ...
January 4, 2016

chemistry
I am wondering why H2S has only London Dispersion forces and not Hydrogen Bonding?
January 4, 2016

Math -Algebra
Is it one unit down or 5 units down?
January 4, 2016

math
Thank you so much! I get it now!!!
January 4, 2016

math
Evaluate tan (inverse cosine of 2/3). a. square root of 5 divided by 2 b. square root of 5 divided by 3 c. square root of 5 divided by 5 I have a feeling that the answer would be a but what i am confused about is how do we figure out what the value is for inverse cosine of 2/3.
January 4, 2016

Math
Solve the system using substitution: x = y - 6 y = 6 - 3x Answer choices: (0,6) (6,0) (0,-6) (-6,0) (
January 3, 2016

Math
How many triangles exist when the measure of angle B is 100 degrees, a =10 and b=5? a. none b. 1 triangle c. 2 triangles I have already solved this and I have found that there will be no triangle because by using the law of sines I found that the value is bigger than 1. So, I ...
December 27, 2015

sri sri ravishankar
What is the ratio of cups of cereal to cups of chocolate chips? What type of ratio is this?
December 18, 2015

Math Help!
The radius of this circle is one unit. Find the exact lengths of the legs in the right triangle if: Sides a is twice as long as side b. And Sides b is twice as long as side a. Basically the hypotenuse of this triangle is 1 and we are trying to use the pythagorean theorem to ...
December 12, 2015

algedra
y=6x+5 and y=6x-7 These to lines are parallel because they have the same slope. y=6 and y=-8 doesn't even have a slope so they are not related. If it was y=6x+5 and y=-1/6x-7, then the two equations would be perpendicular because they are opposite reciprocals.
December 12, 2015

chemistry
I forgot to tell you that this answer is true. Trust me, I'm in AP chemistry right now.
December 12, 2015

chemistry
this is simple. do 12.04 * 10^23 molecules of oxygen multiplied by 1 mole divided by 6.02 * 10^23 molecules of oxygen 12.04 * 10^23 molec. of Oxygen * (1 mol / 6.02 * 10^23 molec. ) = 2 moles of oxygen
December 12, 2015

Math Help Please
The radius of this circle is one unit. Find the exact lengths of the legs in the right triangle if: Sides a is twice as long as side b. And Sides b is twice as long as side a. Basically the hypotenuse of this triangle is 1 and we are trying to use the pythagorean theorem to ...
December 12, 2015

Math Help
you can make a right triangle with the radius. Basically the hypotenuse of this triangle is 1 and we are trying to use the pythagorean theorem to find the lengths of side a and b according to the terms described above.
December 12, 2015

Math Help
The radius of this circle is one unit. Find the exact lengths of the legs in the right triangle if: Sides a is twice as long as side b. And Sides b is twice as long as side a.
December 12, 2015

Math
The radius of this circle is one unit. Find the exact lengths of the legs in the right triangle if: Sides a is twice as long as side b. And Sides b is twice as long as side a.
December 12, 2015

Math
Michael has $50 to spend at the fair .the admission is $10 and each ride is $3.00 ,write an inequality that expresses the number of rides that Michael can ride
December 12, 2015

Math
Diego's deposit $100 and saves $10 per month .write an equation that represent the total amount in his account for x months
December 12, 2015

PHYSICS
I get V'2 = 1.09 m/s and V'1 = 1.99 m/s Does anyone else concur?
December 11, 2015

PHYSICS
A marble with a mass of 0.5 kg is moving to the right at 1.25 m/s and a second marble with a mass of 0.35 kg is moving to the left at 2.15 m/s. If they collide head on and the collision is elastic find the final velocities of the two marbles
December 11, 2015

pharmacy procedures
how many grams of hydrocortisone are present in 40g of a 2.5 percent hydrocortisone ointment
December 10, 2015

Opinion Question
Give me some ideas please. How technology reveals something deeper and essential about human nature: either our strengths or limitations, or both.
December 4, 2015

math
What will be the height of the house if the tower and the house are 50m apart.
November 24, 2015

Genetics/Bio
D, B
November 18, 2015

chem
How many grams of Na2SO4 are present in 500. mL of a 0.750 M aqueous solution? a.70.9 g b.53.3 g c.0.284 g d.106 g e.2.63 g A serum concentration of Mg2+ of 1.75 mmol/L is equivalent to: a.3.50 mEq/L b.1.75 mEq/L c.17.5 mEq/L d.0.875 mEq/L
November 17, 2015

chem
7.76 g of KBr was dissolved in water. The solution was diluted to a volume of exactly 250 mL. What is the molarity of the solution? 32.2 M a.0.476 M b.0.0652 M c.0.0310 M d.0.261 M
November 17, 2015

chem
A solution is prepared by adding 25.0 g of methanol to water to make a total volume of solution of 95.4 mL. What is the weight/volume percent of this solution? a.26.2% b.3.81% c.20.8% d.25.0%
November 17, 2015

chem
At STP a sample of methane gas occupies a volume of 1250 mL. What is the volume of the methane at 100.°C and 760. torr? a.1710 mL b.1250 mL c.915 mL d.1420 mL
November 17, 2015

chem
I am filing out a study guide and needed coaching on some question. thank you 0.765 g of He is placed in a balloon at 1.15 atm. The balloon expands to volume of 5.00 L. What is the temperature of the balloon? a,3.45 K b,91.6 K c,93.4 K d,366 K
November 17, 2015

Calc
A manufacture has been selling 1150 television sets a week at $510 each. A market survey indicates that for each $13 rebate offered to a buyer, the number of sets sold will increase by 130 per week. a) Find the function representing the demand p(x), where x is the number of ...
November 16, 2015

Calc
An open box is to be made out of a 10-inch by 16-inch piece of cardboard by cutting out squares of equal size from the four corners and bending up the sides. Find the dimensions of the resulting box that has the largest volume. Dimensions of the bottom of the box:
November 16, 2015

Calc
Thank you
November 16, 2015

Calc
A stone dropped into a still pond sends out a circular ripple whose radius increases at a constant rate of 2.6 ft/s. (a) How rapidly is the area enclosed by the ripple increasing when the radius is 4 feet? The area is increasing at
November 16, 2015

Math
The top and bottom margins of a poster are 6 cm and the side margins are each 7 cm. If the area of printed material on the poster is fixed at 384 square centimeters, find the dimensions of the poster with the smallest area.
November 16, 2015

Math
A set costs half as much as a book.A book costs 600$ more than a pen.If the total cost of the three items is 6900$,find the cost of a set.
November 16, 2015

maths
there were 32 boys and 13 girls in a school football team they wanted to play 5 a-side football how many teams can they make?
November 11, 2015

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