Monday

October 24, 2016
Total # Posts: 2,087

**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*

**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*