Friday

November 27, 2015
Total # Posts: 878

**Chemistry**

Is this answer correct? Calculate the molar concentration of sodium hydroxide solution if 36.00mL of this solution were required to neutralize 25.00 mL of a 0.2000 M solution of hydrochloric acid. .0288M??????
*May 25, 2011*

**algebra**

Find the value of f(0) if f(x) = x2 - 3x + 2 / x + 1
*May 25, 2011*

**algebra**

Simplify the expression: 3x^2 − 3y + 8x − 5x^2 + 12y
*May 25, 2011*

**science**

what variables can affect the number of eggs laid by a chicken?
*May 9, 2011*

**science**

ok thanks
*May 9, 2011*

**science**

what variable can affect the attendance at a football game?
*May 9, 2011*

**chemistry**

How many grams of magnesium oxide are produced when 40 grams of oxygen react with magnesium
*May 8, 2011*

**Physics**

1. A certain playground merry-go-round is essentially an 90-kg iron disk 2.0 m in radius. Two children, each with a mass of 46 kg, are originally standing on opposite sides of the disk near its outer edge. The merry-go-round is turning essentially without friction about a ...
*May 6, 2011*

**geometry**

oh okay thanks
*May 6, 2011*

**geometry**

Which of the following are measurements of the sides of a right triangle? Select one of the options below as your answer: A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above
*May 6, 2011*

**geometry**

what is the area of a regular polygon with 13.8 area and 6 sides
*May 6, 2011*

**calculus**

When doing a question such as: What is the area of the region enclosed by the graphs of f(x) = x - 2x^2 and g(x)= -5x? what is an easy way to tell if a function is above or under the other, so I can tell which function to put first in the integral. MUCH APPRECIATED!
*May 2, 2011*

**math**

Ben has 15 puzzles and 27cds. When he takes a trip, he likes to bring one puzzle and one cd . How many trips can he take with a different puzzle and cd pair
*April 18, 2011*

**MATH**

A bike club wants to make license plates for bikes. Each license plate has a letter followed by a digit. How many different license plates can be made?
*April 18, 2011*

**math**

Lets try this one last time What is the value for the numerals with letters: 245,189 2=a 5=b 8=c
*April 10, 2011*

**Math**

i will retype this question. What is the value for the numerals with letters. 2 4 5, 1 8 9 a.......b........9.....
*April 10, 2011*

**MATH**

WHAT IS THE VALUE FOR THE NUMERALS WITH LETTERS 2 4 5, 1 8 9 a b c
*April 10, 2011*

**math**

What is the value for the numerals with letters. 245,189 a b c
*April 10, 2011*

**MATH**

One side of a rectangle is 53cm another, another side is 29 cm. What is the perimeter of the rectangle
*April 10, 2011*

**Chemistry**

An atom it ground state contains 18 electrons. How many of these electrons are in orbitals with l=0? a.4 b.2 c.8 d.6
*April 4, 2011*

**Math**

How much did you invest each month at 6.60% compounded monthly if 25 years later the investment is worth 228190.50?
*March 28, 2011*

**language**

From a story,how do you draw a conclusion
*March 23, 2011*

**Physics**

b.) work=Force x Distance x Cos(angle) Work = (3.4kg)(9.8m/s^2)x Cos(90) Work = 0J
*March 15, 2011*

**math**

In the square if part A is 1/4 of the square and part C is 1/10 of the square, what percent of the square is part B?
*March 9, 2011*

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4
*March 7, 2011*

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4
*March 7, 2011*

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4
*March 7, 2011*

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4
*March 7, 2011*

**Math**

Write an equation for the table: x: 8,16,24,32 y: 1,2,3,4
*March 7, 2011*

**Chemistry**

The amount of energy released by burning a fuel source, measured in energy per mass, is called fuel value. If all the energy obtained from burning 1.3 pounds of butane (fuel value 10.85 kcal/g) is used to heat 122 kg of water at an initial temperature of 20.9 degC, what is the...
*February 28, 2011*

**General Chemistry (College LvL)**

When a 4.00g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 2.908 kJ x K^-1, the temperature decreases by .230 K. Calculate the molar heat of KBR
*February 28, 2011*

**Physics**

A 6-kg bowling ball with a radius of 14 cm is spinning about a vertical axis (with its center of mass motionless) at an initial rate of 3 turns per second. Friction with the floor, however, causes the bowling ball to rotate more and more slowly until it stops after about 22s. ...
*February 22, 2011*

**Physics**

Displacement vector [3, 0 , -2] and [-1,5,2]displacement vector , both measured in meters. Find the components of the cross product of these vectors.
*February 22, 2011*

**physics**

At a certain time, a 55-kg person is 25 m due north of you and is walking at a speed of 1.2 m/s exactly southwest. What are the magnitude and direction of this person’s angular momentum about you?
*February 22, 2011*

**physics**

travelling at 90km/hr except for a 30 minute rest stop. Average speed for the trip is 78km/hr. what is the total travelling time and what is the total distance travelled?? thanks
*February 7, 2011*

**Basic Math**

The link you posted made it clear! Thank you Thank you!
*February 6, 2011*

**Basic Math**

A student claims that 2/3 = 6/7 because if you add 4 to both the top and the bottom of a fraction, the fraction does not change. How do you respond? I am a bit confused. Don't you need to have a common denominator?
*February 6, 2011*

**Science**

When u kick a stone your foot exerts force on the stone and the stone exerts a force ? in size and ? in direction on your foot
*February 5, 2011*

**Chemistry**

The following information is given for ethanol, C2H5OH, at 1atm: boiling point = 78.4oC Hvap(78.4oC) = 38.6 kJ/mol melting point = -115oC Hfus(-115oC) = 5.02 kJ/mol specific heat liquid = 2.46 J/goC At a pressure of 1 atm, what is H in kJ for the process of condensing a 40.8 g...
*January 24, 2011*

**math 10 **

how do i work out the answer to: "how many integer values are there for k for which 4x^2 + kxy - 9y^2 is factorable?"
*January 24, 2011*

**math**

each box has 10 pencils . how many pencils do 3 boxes have ?
*January 21, 2011*

**math**

how to isolate a variable with a component. 60+80x1 over 2 to the exponent of "T" over 30+20 solve for T
*January 19, 2011*

**math**

how to isolate a variable with a component. 60+80x1 over 2 to the exponent of "T" over 30+20
*January 19, 2011*

**8th grade Math**

You divide by -1
*January 13, 2011*

**Math**

A set of data has a mean of 35 and an outlier of 100. You find the mean without the outlier. Which of the following best describes your new mean?
*January 11, 2011*

**english**

help me please!!!!! The manner in which action is presented indicates verb: mood. tense. voice.
*January 11, 2011*

**calculus**

How do you find the derivative of (-2(x^2+1))/((x^2-1)^2) ? I have the answer which is: (4x(3+x^2))/(x^2-1)^3) I can't figure out my mistake when I'm doing it though. Could you solve it step by step?
*January 6, 2011*

**Social Studies**

How have the uses of Bamboo changed since 1980 until now?
*January 5, 2011*

**MATH**

how do i solve this into a proportion, 3oz for $1.65; 5oz for x dollors
*December 18, 2010*

**Physics**

Consider two vectors where F1 = 40 N, F2 = 57 N, and \theta _{1} = 240o and \theta _{2} = 25o, measured from the positive x-axis with counter-clockwise being positive. What is the magnitude of the equilibriant?
*December 14, 2010*

**8th grade math**

i need help
*December 13, 2010*

**math**

what fraction strips would you use yto find the sum of 3/8 and 4/8? explain
*December 9, 2010*

**cal 1**

Find the dimensions of the rectangle of largest area that has its base on the x-axis and its other two vertices above the x-axis and lying on the parabola. (Round your answers to the nearest hundredth.) y = 7 - x^2
*December 8, 2010*

**Cal**

Find the slope of the tangent line to the curve at (2,1) x/y + x^2y^2 = 6
*December 8, 2010*

**physics**

A boy pulls his little brother in a little red wagon. He keeps the handle horizontal to the ground. His little brother and the wagon weigh 40 kg. How much tension will the boy have to place on the wagon's handle to get it moving from a standstill?
*December 6, 2010*

**English**

In Invisible Man, the main character disproved of Tod Clifton and didn't like that he was selling sambo dolls. Why would he then make Clifton seem like a hero, and give a grand speech about him at his funeral? Was it because he wanted to impress others with his oratorical ...
*November 27, 2010*

**Physics**

2.23
*November 18, 2010*

**History**

When was the evolution of the socio- political milieu during the colonial period including Protestant Christianity's impact on colonial social life
*November 15, 2010*

**Cal**

A plane flying horizontally at an altitude of 3 mi and a speed of 480 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest whole number.)
*November 11, 2010*

**math**

a deposit of $2500 grew to $3325 after six years. what is the final value of a deposit of $7500 at the same interest rate for the same period of time?.
*November 9, 2010*

**Chemistry**

Use a combustion reaction of liquid ethanol in air as a source of work, assuming temperature is 25 deg C, air pressure is 1atm and all products are gases with partial pressures of 10atm each. How high can one lift a 1000kg weight by burning 100g of ethanol? *oxygen is 21% (by ...
*November 7, 2010*

**Physics**

A baseball is popped straight up into the air and has a hang-time of 6.25 s. Determine the height to which the ball rises before it reaches its peak.
*November 1, 2010*

**Chemistry**

you have them in order already, from weakest to strongest.
*October 31, 2010*

**Physics-Kinetic energy**

the only formula you will need for both of these questions is : E = 0.5mv^2 E = kinetic energy (J) m = mass of object (kg) v = velocity of object (m/s) you should be able to go from here, just sub in the values.
*October 30, 2010*

**physics**

use the formula F=ma remember m has to be in kg
*October 30, 2010*

**Earth Science**

the tilt of the earth and the rotation of the earth around the sun. try to picture the scenario, as the earth revolves around the sun with the tilt that it has, half of the year the northern hemisphere will be closer to the sun and the other half of the year the southern ...
*October 30, 2010*

**Physics kinetic energy**

because v is the only thing changing the value of m is not relevant. to find out what would happen to the energy we compare the differences in v ie 10^2 = 100 5^2 = 25 since the new v value is a quarter of the previous value the answer is (d) alternatively, your reasoning ...
*October 30, 2010*

**Physics acceleration**

a = (v-u)/t v = final velocity (m/s) u = initial velocity (m/s) t = time taken for change in velocity (s) a = acceleration (m/s^2)
*October 30, 2010*

**maath**

draw the graph of y = 3^x then look to see where y = 9, this is where 3^x = 9
*October 29, 2010*

**Physics**

On an open-reel tape deck, the tape is being pulled past the playback head at a constant linear speed of 0.372 m/s. (a) If the radius of the film taken up so far (as shown in the upper part of the drawing) is 0.0576 m, find the angular speed of the take-up reel. ____ rad/s (b...
*October 25, 2010*

**geometry**

How would you figure this question out? :The measures of two sides of a triangle are 8 and 11. Use an inequality to express the range of the third side, m.
*October 24, 2010*

**physics**

An electric drill starts from rest and rotates with a constant angular acceleration. After the drill has rotated through a certain angle, the magnitude of the centripetal acceleration of a point on the drill is twice the magnitude of the tangential acceleration. What is the ...
*October 24, 2010*

**Chemistry 1**

What is the minimum amount of a 6.0 M solution of sulfuric acid necessary to produce 25 grams of hydrogen gas if the molar ratio in the chemical reaction is a 1:1
*October 21, 2010*

**Physics**

A force of 165 N is needed to keep a small boat moving at 2.57 m/s. What is the power required to keep the boat moving at the steady speed? >> I understand that P=Fv but I don't understand the second question. If the resistive force of the water increases with the ...
*October 20, 2010*

**Physics**

A force of 165 N is needed to keep a small boat moving at 2.57 m/s. What is the power required to keep the boat moving at the steady speed? >> I understand that P=Fv but I don't understand the second question. If the resistive force of the water increases with the ...
*October 20, 2010*

**MATH**

SHOW IN A SKETCH 3/5 OF AN HOUR
*October 18, 2010*

**Physics**

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
*October 15, 2010*

**Advanced Algebra 1**

A polygon has a perimeter of 24mm. Find the new perimeter after a scale factor of 1/4 is applied?
*October 14, 2010*

**College Physics**

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 96.5 kg. The mass of the rock is 0.250 kg. Initially the wagon is rolling forward at a speed of 0.460 m/s. ...
*October 14, 2010*

**science**

how many hm are in 726.5 dm ?
*October 8, 2010*

**physics**

The drawing shows a version of the loop-the-loop trick for a small car. If the car is given an initial speed of 4.5 m/s, what is the largest value that the radius r can have if the car is to remain in contact with the circular track at all times?
*October 8, 2010*

**CALC**

Ok, I was half right. The formula works for cubes and squares if you think of the area of a square being 4r^2, and the volume of cube being 8r^3, where r is the radius and x=2r
*October 7, 2010*

**CALC**

Nevermind, I lied.
*October 7, 2010*

**CALC**

You have to start from the origin. Try calculating it in terms of r, where x=2r. You will get the right answer
*October 7, 2010*

**Intermediate Algebra**

Determine whether the point (1, 8) is a solution of the system 2x + 6y = 50 10x + 0y = 10 by substituting the point into each equation. So far I have: 2x=6y=50 y=50-2x 10x+10y=10 10x+0(50-2x)=10 10x+0=10 x=10 y=50-2x y=50-2(1) y=50-2 y=48 PLEASE HELP! I'm lost. I've ...
*October 7, 2010*

**Physics**

A) Calculate the mass of the sun from the radius of the earth's orbit (1.50×1011 m), the earth's period in its orbit, and the gravitational constant G. B) What is the density of the sun ? (The sun's radius is 6.96×108 m). Notice how it compares with the...
*October 6, 2010*

**math**

I neeeed help on this problem 3x-5y=7 5x-2y=-1 It's addition method and I can't figure it out plleeaaaassse help me
*October 4, 2010*

**math**

did you hear about...
*October 4, 2010*

**statistics**

Event Probability Too much enamel 0.25 Too little enamel 0.2 Uneven application 0.35 No defects noted 0.42 (1) What is the probability of a paint defect? What is the probability of a paint defect which includes an improper amount of paint?
*September 29, 2010*

**math**

Event Probability Too much enamel 0.25 Too little enamel 0.2 Uneven application 0.35 No defects noted 0.42 (1) What is the probability of a paint defect? What is the probability of a paint defect which includes an improper amount of paint?
*September 29, 2010*

**AP U.S. history**

what additional safeguards were proposed by thomas jefferson and james madison in the virgina and kentucky resolutions, and what werethe implications of these resolutions with regard to the growth of the centeral government?
*September 26, 2010*

**trig**

Let µ be an angle in standard position that contains the point with co- ordinates (-5;-12) on its terminal side. Determine the values of the six trigono- metric functions of angle µ.
*September 23, 2010*

**math**

Assume that there are 13 frozen dinners: 5 pasta, 4 chicken, and 4 seafood dinners. The student selects 5 of them. What is the probability that at least 2 of the dinners selected are pasta dinners?
*September 20, 2010*

**physics**

d=vot+1/2at^2 vf=vo+at V=d/t Use these equations to solve the problem.
*September 19, 2010*

**11th grade**

Angle QRS is a straight angle. If a=2c, c=2b, and b=d/3, what are the values of a,b,c,and d? a+b+c+d = 180
*September 13, 2010*

**space**

How could measuring the orbit of a comet help scientists understand when it will next be visible from Earth?
*September 9, 2010*

**Math**

Draw a number line make sure the following numbers are on your number line 1,472: 1,560: 1,481
*September 9, 2010*

**Math/College Algebra**

1.)Complete the square to find all real solutions of equation 3 x^2 + 4 x - 1 = 0. X1= X2= 2.)\sqrt{7 x - 9} + 6 = 3x there are two solutions 3.)4 <= 5 x - 4 <10 4.)(x/4x-16)-7 = (1/x-4) 5.) (1/R) = (1/R1)+ (1/R2) for R1
*August 29, 2010*

**math**

It's from a website called WebWork where we do the homework on.
*August 22, 2010*

**math**

wow thank you so much! i spent hours on that problem. thanks again for the help.
*August 22, 2010*