Friday

October 24, 2014

October 24, 2014

Total # Posts: 871

**math**

Tony and Tom are brothers.This year both of their ages are prime numbers. Last year both of their ages were composite numbers. Both of their ages will be composite numbers again over the next three years. If Tony and Tom are both teenagers, how old are they now?
*September 29, 2011*

**math/science**

this is the only information we have been given. hope someone can help.
*September 29, 2011*

**math/science**

Please can you explain how to do the following: a) a non-smoker with low blood pressure has a plasma chloesterol concentration of 5mmol per litre. Over a period of time this concentration increases to 8mmol per litre. By how many times has this risk of heart disease increased...
*September 29, 2011*

**biology**

Please can you explain how to do the following: a) a non-smoker with low blood pressure has a plasma chloesterol concentration of 5mmol per litre. Over a period of time this concentration increases to 8mmol per litre. By how many times has this risk of heart disease increased...
*September 28, 2011*

**physics**

A diver leaves the board traveling at 3.5 m/s at an angle of 75º with respect to the horizontal. What is her speed when she hits the water, 3 meters below?
*September 27, 2011*

**math**

A cube measures 2 meters on each side. What is the volume of the cube?
*September 25, 2011*

**Math**

simplify (8 – i) – (4 – i) using Complex Numbers
*September 7, 2011*

**algerbra**

if 16-b<7 then, a) b < or equal to 8 b) b > 9 c) b < or equal to 7 d) b > or equal to 7
*September 4, 2011*

**chemistry**

Q(H20)=100g x 4.18 JK-1g-1 x 30K =100 x 4.18J x 30 (Since the rest cancel each other out) Wallah
*September 3, 2011*

**Algebra II**

"The smallest integer divisible by 10 and 32 is 160, and the smallest integer divisible by 6 and 20 is 60. The difference between them is 100." - Princeton Review
*July 26, 2011*

**Algebra II**

I think it's C.
*July 26, 2011*

**Pre-Calc**

Let cis Θ = cos Θ + i sin Θ. Let z1 = 3 cis 25 and let z2 = 4 cis 115 Find z2^6
*July 25, 2011*

**Occ**

(x^2 +4)y = 2x
*July 25, 2011*

**Math**

Let cis Θ = cos Θ + i sin Θ. Let z1 = 3 cis 25 and let z2 = 4 cis 115 Find z2^6
*July 25, 2011*

**geometry**

You can't find out the scale factor if you aren't given any numbers for the sides of the triangles.
*July 21, 2011*

**Algebra**

If A + B = 12, and B + C = 16, What is the value of A + C? A. -4 B. -28 C. 4 D. 28 E. The answer cannot be determined from the given information.
*July 13, 2011*

**math**

each side of a square painting id 5 ft long.what is the painting area.what is the painting perimter?
*June 20, 2011*

**algebra**

use 2 as the base!, 2 raise to the power of n, where n is the number of elements in a set.
*June 11, 2011*

**algebra**

whats the fastest and most easiest way to find all the subsets in a given set?
*June 11, 2011*

**Chemistry**

How do you balance the equation when citric acid is added to NaOH?
*June 8, 2011*

**Geometry**

A solid is composed of a cube with side length 6 meters and a hemisphere with diameter 6 meters. Find the volume of the solid.
*June 1, 2011*

**Geometry**

A rectangular prism with 2 little square bases of a radius of 1m. It's height or rectangular length is 5m. Please help me find the surface area. The answer should be less than 50m².
*June 1, 2011*

**Mathematics**

Plug in d. D = the number of minutes the practice drills last "30 minutes are spent on practice drills." 20 + 30 + 10 = 60 minutes.
*June 1, 2011*

**Trigonometry**

Solve SSA: B= 12.1 degrees b= 16 a= 23.9
*May 30, 2011*

**Trigonometry**

Use Heron's formula: a=46 b= 52 c= 67
*May 30, 2011*

**Trigonometry**

verify the identity: 1-cos^2x/1-sinx= -sinx
*May 30, 2011*

**U.S. History**

True or False? "The rebels are our country men again." Is a quote that is referring to the Emancipation Proclamation.
*May 25, 2011*

**U.S. History**

True or False? General Sherman's 60 miles path of destruction was from Atlanta, Georgia to Savannah, Georgia?
*May 25, 2011*

**U.S. History**

True or False? If a soldier had a wounded arm, it would most likely be amputated during the Civil War.
*May 25, 2011*

**U.S. History**

Life for African Americans in the South changed after the Civil War because many Africans Americans...?
*May 25, 2011*

**MATH ~~**

HELP Please!! Sample autocorrelations at lag1, lag2, and lag3 denoted by r1, r2, and r3 of weekly sales of shampoo bottles was found 0.4551, 0.3376, and 0.2514. Using the criteria of your text, the maximum number (‘n’) of weeks for shampoo bottles sales to be ...
*May 25, 2011*

**physical science**

true/false All units of energy are vectors.
*May 23, 2011*

**physical science**

true /false for every action, there is an equal and opposite reaction is best defined as Newton's Third Law
*May 23, 2011*

**physical science**

true/false A lens that converges light is concave
*May 23, 2011*

**physical science**

true/false the force of friction always opposes motion.
*May 23, 2011*

**Geometry**

A square is circumscribed about a circle. What is the ratio of the area of the circle to the area of the square? A. 1/4 B. 1/2 C. 2/π D. π/4
*May 18, 2011*

**math**

Basically 41 and 17/12 minus 27 and 7/12. So it's 14 5/6
*May 18, 2011*

**math**

Basically 41 and 17/12 minus 27 and 7/12. So it's 14 5/6
*May 18, 2011*

**physics ( need answer very very soon pleaseeeee)**

how do we find out the electron charge and mass if we dont know what type it is?
*May 13, 2011*

**physics ( need answer very very soon pleaseeeee)**

a. Acceleration is a = e*E/m e is the electron charge and m is the electron mass b. Solve the equation Since the electron's velocity component parallel to the plates remains the same as when it entered, t = 0.10 m/(3*10^6 m/s)
*May 13, 2011*

**Astronomy**

In what ways do Earth and the moon move through space? How do these motions produce such phenomena as day and night, the seasons, phases of the moon, and eclipse?
*May 12, 2011*

**Astronomy**

You are correct.
*May 12, 2011*

**Physics**

Explain why objects experience a buoyant force when immersed in a fluid. How can you find the value of the buoyant force?
*May 12, 2011*

**calculus**

The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken to run 1000 metres for a sample of 30 ...
*May 12, 2011*

**Chemistry**

Explain why carbohydrates, lipids, and proteins are important parts of a well-balanced diet.
*May 10, 2011*

**Chemistry**

so 3 to 6...
*May 10, 2011*

**Chemistry**

What is the ratio of carbon atoms to hydrogen atoms in the compound 2CH2 = C2H4? A. 1 to 9 B. 9 to 1 C. 3 to 6 F. 6 to 3
*May 10, 2011*

**Chemistry**

What is an unsaturated hydrocarbon?
*May 10, 2011*

**Chemistry**

Material X is an organic compound that mixes poorly with water and is highly flammable. Of the following choices, material X is most likely a(n): A. Carbohydrate B. Ester C. Alcohol D. Hydrocarbon
*May 10, 2011*

**Chemistry**

C5H11Oh represent... A. Amino Acid B. Organic Acid C. Alcohol D. Ester
*May 10, 2011*

**Math**

It would be mostly addition or subtraction...
*May 9, 2011*

**pre algebra**

If you wanted factored its 2(5x+37). If wanted it simplified its 10x+74. If you wanted to combine the expressions its 10x+74. If you wanted it evaluated plug in x.
*May 9, 2011*

**physics**

A block of mass M connected to an untstretched horizontal spring of spring constant k is hit by a bullet of mass m which has a velocity V just before the collision. The bullet stays in the block. The coefficient of friction between the block and surface is b. Explain how do ...
*April 21, 2011*

**Pre-Calculus Vectors**

nvm got it
*April 18, 2011*

**Pre-Calculus Vectors**

Let u = 2i − j, v = −i + j. Find 2u - 3v.
*April 18, 2011*

**Pre-Calculus**

My "diagram" messed up. The y axis is broken its supposed to look like a Cartesian plane.
*April 18, 2011*

**Pre-Calculus**

Let F1 = 219.5, F2 = 447.3, θ1 = 52.79◦, θ2 = 7.831◦. Find the magnitude of the resultant F1 _\|_ θ1 (in quadrant 3 positive) | F2 _|/_ θ2 (in quadrant 1 positive) | I know this is probably hard to understand but I cannot draw diagrams on here
*April 18, 2011*

**algebra 1**

given;n+8(n+20)=110 1;n+8n+20=110 2;9n+20=110 3;9n=110-20 49n=90
*April 11, 2011*

**Physics 20**

DYNAMICS: A 54kg fireman slides down a pole of a distance of 3m. if the man hits the groung at 4.4m/s than what will the force of friction acting on the man due to the pole?
*April 6, 2011*

**Physics 20**

dynamics A curling stone has a mass of 20kg. a curler pushed the stone across the ice to launch it down the rink. a)if the curler starts to move the stone by pushing it with 15N, what is the stones initial acceleration? b)once moving, how much force is required to keep the ...
*April 6, 2011*

**physics**

DYNAMICS: A 54kg fireman slides down a pole of a distance of 3m. if the man hits the groung at 4.4m/s than what will the force of friction acting on the man due to the pole?
*April 6, 2011*

**physics 20**

DYNAMICS: a skier starts at the top of a 30m hill ta an anle of 20 degrees. the skier goes straight down the firctionless slope. How long will it take the skier to get to the bottom?
*April 6, 2011*

**Physics 20**

Dymamics unit A car standing still is struck by 2 other cars simultaneously. a beetle applies a force of 2350N [N60degreesE] and a truck applies a force of 4150N [SW]. What is the net force acting on the stationary car?
*April 6, 2011*

**physics 20**

DYNAMICS: A 54kg fireman slides down a pole of a distance of 3m. if the man hits the groung at 4.4m/s than what will the force of friction acting on the man due to the pole?
*April 6, 2011*

**Physics 20**

Dymamics unit A car standing still is struck by 2 other cars simultaneously. a beetle applies a force of 2350N [N60degreesE] and a truck applies a force of 4150N [SW]. What is the net force acting on the stationary car?
*April 6, 2011*

**English**

what is art online? ( online art galeries, virtual art, nowadays art or something different?)
*April 6, 2011*

**English**

What is the role of art in people’s life?
*April 5, 2011*

**Physics 1301**

ac = (omega^2)*(radius) = (31.2^2)*(0.12 m) = 116.8
*April 4, 2011*

**english**

Section I: Make all necessary corrections to the following sentences. If a sentence has no errors, mark it correct as written: I did it but need reassurance. first sentence is teachers the second one is mine. 1. I’ve always wanted to go to college, it is something my ...
*April 1, 2011*

**world geography**

Start locally and then work your way up is basically very common if you start with little.
*March 31, 2011*

**Pre-calc**

for some reason i am gettin 23pi/24
*March 29, 2011*

**Pre-calc**

how many radians are displaced by the minute hand of a clock between 1:00 pm and 6:45 pm of teh same day
*March 29, 2011*

**equal to greater than and less than**

bryce and jewel were playing with kick balls in gym class. Bryce kicked seven tenths of the kick balls into the net. Jewel kicked twenty three thirtieths of the balls into the net. Which athlete scored more goals?
*March 29, 2011*

**geometry**

I got this problem wrong on a test and i want to know how to fix it. In triangle ABC, angle A is 20 degrees and side AC is 7.89 units, find the other sides and angles
*March 29, 2011*

**physics**

A certain roller coaster has a circular, vertical loop of radius 10 meters, such that at its top the riders are upside down. How fast does the roller coaster move at this point if the riders feel perfectly weightless when passing the top of the loop?
*March 23, 2011*

**chemistry**

how would you say in words LiMnO2 ? would lithium manganese oxide be correct?
*March 21, 2011*

**physics**

magine a straight line connecting the centers of the earth and the moon. At some point along this line the gravitational forces pulling a spacecraft towards the moon and towards the earth exactly balance each other, and the craft could just sit there in (an unstable) ...
*March 20, 2011*

**chemistry**

what effect would each of the errors decribed below have on the concentration of potassium hydrogen phthalate... 1) so of the solids potassium hydrogen phthalate will spilled when transfering into the beaker... 2) not enough water was added to bring the volume up to the mark
*March 13, 2011*

**Chemisrty**

What is the pH of a 0.20 M solution of NH4Cl? [Kb(NH3) = 1.8 × 10−5]
*February 22, 2011*

**math**

The Wildlife Federation surveyed 170 San Diego residents. The results are as follows: 26 had a membership to the Birch Aquarium 44 had a membership to the San Diego Zoo 17 had both construct a venn diagram answering the foloowing questions i. How many had only a zoo membership...
*February 20, 2011*

**Physics**

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s2 . What is the mass of the car?
*February 1, 2011*

**physic**

examples of mechanicals waves
*January 31, 2011*

**Chemistry**

moles of NaOH = .100 x 35.46 / 1000 = 0.003546 2NaOH + H2A = Na2A + 2H2O so moles of H2A = 0.001773 these are in .43 g so mass of 1 mole = .43 /0.001773 = 242.53 g / mole .. molar mass of the acid
*January 24, 2011*

**hum**

Explain the basis of judgement you believe should be used for addressing the moral questions oe delimmas surroundingclimate change
*January 19, 2011*

**Math**

What is the circumference of a circle with a diameter of 10 m.
*January 17, 2011*

**Math**

If a right triangle has legs of 9in. and 12in. What is the length of the hypotenuse?
*January 11, 2011*

**Alg II**

I have a rectangle whose sides are in the proportion b:a, where b is the longer side. I draw a line parallel to a inside the rectangle in order to break it up into a square with sides of length a and a second rectangle. Amazingly, the sides of the new smaller rectangle are in ...
*January 11, 2011*

**9th grade alegbra**

IDK
*January 11, 2011*

**geometry**

I've got it! Thank you very much for your help!
*January 9, 2011*

**geometry**

The real problem is that I do not comprehend the question. The part I'm really stumbling over is the "rotated about the side AB". I have no idea what that means.. I have another question that is quite similar...so if anyone can explain, it would be greatly ...
*January 9, 2011*

**geometry**

The rectangle ABCD is rotated about the side AB. Find the volume of the solid defined by this rotation. AB = DC = 4cm AD = CB = 2cm
*January 9, 2011*

**Math **

to identical jars are filled with equal amount of marbles. the marbles are coloured red or white. the ratio of red to white marblesis 7:1 in jar 1 and 9:1 in jar 2. if there are 90 white marbles altogether, determine the number of red marbles in jar 2.
*December 18, 2010*

**physics**

10cm * 10 cm *10 cm
*December 17, 2010*

**french**

How would you say it would be necessary using the verb falloir?
*December 15, 2010*

**physics cant firgure this out**

would it be 310/(298-310) im just makeing sure let me know please thank you
*December 10, 2010*

**physics cant firgure this out**

A Carnot air conditioner maintains the temperature in a house at 298 K on a day when the temperature outside is 310 K. What is the coefficient of performance of the air conditioner?
*December 10, 2010*

**physics**

why does the voltage across the thermistor and resistor add up to the voltage of the battery? thanks :)
*December 8, 2010*

**physics**

why is the current the same in the resistor and the thermistor in a series circuit? thanks :)
*December 8, 2010*

**integration**

Find the area of the region under the graph of the function f on the interval [-1, 2]. f(x) = 6x + 1 bound by the x axis
*December 8, 2010*

**physics**

Battery supplies a potential difference of 6v At a certain temperature the current in the 45ohms resistor is 0.08A How would you calculate the potential difference across the thermistor? thanks :)
*December 8, 2010*

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