Saturday

October 25, 2014

October 25, 2014

Total # Posts: 1,120

**Chemistry**

Calculate the molar heat of neutralization in kJ/mol of the reaction between HA and BOH given the following information: The temperature change equals 8C, 50 mL of 1 M concentration of Acid 50 mL of 1 M concentration of Base Heat capacity of the calorimeter is 6.5 J/C. ...
*November 20, 2011*

**math**

prove these identies sin^2+tan^2=sec^2-cos^2 sin^2 sec^2 +sin^2=tan^2+sin^2
*November 18, 2011*

**math**

An urn contains 5 red marbles, 4 blue marbles, and 3 green marbles. A marble is selected at random and then, without replacing the first marble, a second marble is selected at random. What is the probability of selecting a green marble and then a red marble?
*November 16, 2011*

**English**

What are the differences between the characters Johnny and dally, in the story The Outsiders by S.E. Hinton?
*November 14, 2011*

**english**

what does this mean? how can i summarize it ?? "we acquire language not just because we are taught it, but because we are born with the principles of language. They're in our genes. We have language because of nature, not just nurture"
*November 14, 2011*

**math **

Let R be a commutative ring in with a^2=a for every element a. Show that a+a=0 for all a in R
*November 13, 2011*

**MATH--PLEASE HELP**

Let W be the set of all continuous fuctions from the set of real numbers R to R. For f, g in W define f+g by (f+g)(x)=f(x)+g(x) and (f*g)=f(x)g(x). Verify that W is a commutative ring. Does W have unity? Why or why not?
*November 13, 2011*

**algebra**

7 * sqrt 20 = 7 * sqrt 5 * sqrt 4 = 7* sqrt5 * 2 = 14sqrt5 so (14sqrt5) - (8sqrt5)= 6sqrt5
*November 13, 2011*

**Biology**

In guinea pigs, gene B is for black, b is for white the heterozygote is a mixture, called agouti. ( sex linked and non dominant) , a litter consists of 5 agouti females and 6 black males , if the parents of this litter had more offspring , what other phenotypes would you ...
*October 26, 2011*

**Biology**

In man, muscular dustrophy , is inherited as a sex linked recessive , a couple , both of whom are normal, have five children, three boys and two girls , the oldest boy is beginning to show symptoms of the disease, what could you tell them about the chances of their children ...
*October 26, 2011*

**Biology**

Suppose that a clolur blind man has parents with normal vision. Would all his sons be colour-blind ? Was his mother a carrier ? would all his daughters be carriers
*October 26, 2011*

**math**

determine the value of k such that g(x)=3x+k intersects the quadratic function f(x)=2x^2-5x+3 at exactly one point determine the value(s) of k such that the linear function g(x)=4x+k does not intersect the parabola f(x)=-3x^2-x+4
*October 24, 2011*

**math**

Determine the equation of the inverese of the quadratic function f(x)=x^2-4x+3
*October 22, 2011*

**math**

The sum of two numbers is 16 . What is the largest possible product between these numbers
*October 22, 2011*

**math**

Express each function in standard form f(x)=-3(x-2)^2+5 f(x)=2(x+4)(x-6)
*October 22, 2011*

**math**

For a fixed element 'a' of a ring R, prove that the set {x exists in R such that ax=0)is a subring of R.
*October 20, 2011*

**History**

Did the Elastic Clause justify acts such as Hamilton's excise tax and the Bank of the United States or Jefferson's Louisiana Purchase?
*October 19, 2011*

**Math( help please ! )**

The profit p(x) of a cosmetics company , in thousands of dollars,is given by p(x)=-5x^2+400x-2550, where x is the amount spent on advertising , in thousands of dollars a) determine the max profit the company can make b)Determine the amount spent on advertising that will result...
*October 17, 2011*

**Math( help please ! )**

thank you so much
*October 17, 2011*

**Math( help please ! )**

The height of a ball thrown vertically upward from a rooftop is modelled by y=-5t^2+20t+50 , where h(t) is the ball's height above the ground , in meters , at time t seconds after the throw a) Determine the max height of the ball b) how long does it take for the ball to ...
*October 17, 2011*

**Math( help please ! )**

Determine the maximum of or the minimum value of y=2x^2+12x
*October 17, 2011*

**Biology **

In drosophila , short wings , and black colour are reccessive traits.long wings and grey colour are dominant. show the cross results between a short winged , heterozygous grey fly and a heterzygous long winged grey fly
*October 17, 2011*

**Biology( HELP PLEASE)**

thank you so much
*October 14, 2011*

**precalcus**

a positive angle less than 2 pi their is a coterminal 17 pi/4
*October 13, 2011*

**Math**

the height of a rocket above the ground is modelled by the quadratic function h(t)=-4t^2+32t a) how long will the rocket be in the air ? how do you know? b) what is the maximum height that the rocket will reach ?
*October 13, 2011*

**physics**

According to the above reference the answer would be 45cm yes? - which doesn't make sense because there is only 20cm of board from the end of the table. And i'm not exactly sure where the 25cm came from? Can someone please expand on this answer?
*October 12, 2011*

**Math**

50x^2-72
*October 10, 2011*

**Mathh !!!!! Help please !!!**

i tried these quesions so many times , but i just cant get he right answer ! 1.) 4(2-a)^2-81 2.) -(x-y)^3 3.)3x^2-27(2-x)^2 4.) 9(y-1)^2-25
*October 2, 2011*

**Math help please**

i tried these quesions so manytimes , but i just cant get he rigt answer ! 1.) 4(2-a)^2-81 2.) -(x-y)^3 3.)3x^2-27(2-x)^2 4.) 9(y-1)^2-25
*October 2, 2011*

**Math**

Factor 1. a^4-16 2. (m-n)^2-(2m+3n)^2 3.2x^4y^4-6x^5y^3+8x^3y 4.12m^2n^3+18m^3n^2
*October 2, 2011*

**Math**

simplify 1. (2x^4-3x^2-6)+(6x^4-x^3+4x^2+5) 2. -7x(x^2+x-1)-3x(2x^2-5x+6) 3. -2x[ 5x-(2x-7)]+6x[3x-(1+2x)]
*October 2, 2011*

**Math**

expand and simplify 1. -(y^2-4y+7)(3y^2-5y-3) 2.2(a+b^3
*October 2, 2011*

**math**

expand and simplify 1.(x^2-3x+4)(-x^2+3x-4) 2.3(2x-5)-9(4x-5)
*October 2, 2011*

**Math**

Factor 1. 8a^2-2ab-21b^2 2. 6m^2-90m+324 3.5x(2-x)+4x(2x-5)-(3x-4) 4. 9(y-1)^2-25 5. 3x^2-27(2-x)^2
*October 2, 2011*

**Math**

Expand and simplify 1.(9a-3)^2 2.(x^2+2x-1)^2 3. 2(3a+4)(a-6)-(3-a)^2+4(5-a)
*October 2, 2011*

**math**

If f(x) = (x-4) (x+3) , determine the x-intercept of each function a)y=f(x) b) y=-2f(x) c) y=(-(x+1)) thanks for the help !!!!!!
*September 25, 2011*

**math**

a function f(x)has doamin {xeR/x>-4} and range {yeR/y<-1) . Determine the domain and range for each function. a) y=2f(x) b) y=f(-x) c) y=3f(x+1)+4 d) y=-2f(-x+5)+1 thanks for the help !!!
*September 25, 2011*

**Math !!!!!**

a function f(x)has doamin {xeR/x>-4} and range {yeR/y<-1) . Determine the domain and range for each function. a) y=2f(x) b) y=f(-x) c) y=3f(x+1)+4 d) y=-2f(-x+5)+1 thanks for the help !!!
*September 24, 2011*

**Math**

If f(x) = (x-4) (x+3) , determine the x-intercept of each function a)y=f(x) b) y=-2f(x) c) y=(-(x+1)) thanks for the help !!!!!!
*September 24, 2011*

**math **

for h(x)=5-4x, determine the input for x when the output of h(x) is -11 i have tried to answer this question so many times , but i cant figure it out
*September 22, 2011*

**math **

a teacher asked her students to think of a number, multiply by 5, and subtract the product from 20 , then she asked them to multiply the resulting difference by the number they first thougt of a) use function notation to express the final answer in terms of the orginal number ...
*September 22, 2011*

**Math**

for h(x)=5-4x, determine the input for x when the output of h(x) is -11
*September 22, 2011*

**Math**

a teacher asked her students to think of a number, multiply by 5, and subtract the product from 20 , then she asked them to multiply the resulting difference by the number they first thougt of a) use function notation to express the final answer in terms of the orginal number...
*September 22, 2011*

**math**

for h(x)=5-4x, determine the input for x when the output of h(x) is -11
*September 21, 2011*

**math **

a teacher asked her students to think of a number, multiply by 5, and subtract the product from 20 , then she asked them to multiply the resulting difference by the number they first thougt of a) use function notation to express the final answer in terms of the orginal number ...
*September 21, 2011*

**math**

sorry for the delay.. I don't understand. I do understand that a new 1000 is not needed because once added, it's still 1000 but as as far as the rest, I don't understand. Trying to help my daughter with her math homework!
*September 20, 2011*

**math**

sorry for the delay.. I don't understand. I do understand that a new 1000 is not needed because once added, it's still 1000 but as as far as the rest, I don't understand. Trying to help my daughter with her math homeworl!
*September 20, 2011*

**math**

write each addition vertically.decide which new groups you will make.then,add to see if you were correct. 256+1273___________ a new ten?____________ a new hundred?_________ a new thousand?____________ need answers and please explain
*September 20, 2011*

**visual basic 2010**

I am totally lost with arrays. I have a program that needs to store users entries(first & last name...etc) in 2 different arrays. The summary button then loops thru each array and outputs their contents to the immediate window. Then the exit button displays the number of items...
*September 18, 2011*

**language arts**

Some visitors to the park enjoy rock climbing others prefer kayaking.
*September 17, 2011*

**Physics**

You compress air saturated with water vapor at 24°C and atmospheric pressure (101.325 kPa) until the total pressure is doubled and the temperature is 36°C. What is the final pressure of the water vapor?
*September 13, 2011*

**Physics**

The V.A-3 had an average speed of 96 km/h. Its momentum at this speed was 4.8 x 10(4)kg x m/s. What was the mass of the V.A-3?
*September 12, 2011*

**algebra**

60 = (66+72+90+49+59+x)/6 Solve for x.
*September 5, 2011*

**Algebra**

60 = (66+72+90+49+59+x)/6 Solve for x.
*September 5, 2011*

**Algebra**

Thank you, I got that but I don't know how to solve for x
*September 5, 2011*

**Algebra**

To pass a course you need an average score of 60 or more. If your scores are 66, 72, 90, 49, and 59, find the minimum score that you can get on the 6th and last exam to pass the course.
*September 5, 2011*

**PHYSICS**

A piece of wood is floating at the surface of some water as illustrated (the diagram is not to scale). The wood has a circular cross section and a height h = 4.0 cm. The density of water is 1.00 g/cm3. The distance y from the surface of the water to the bottom of the wood is 3...
*August 9, 2011*

**PHYSICS**

A 50cm long hollow glass cylinder is open at both ends and is suspended in air. A source o sound that produces a pure frequency is placed close to one end of the tube. The frequency of the sound is slowly increased from a very low value. The tube is first observed to resonate ...
*August 9, 2011*

**PHYSICS HELP**

A solid cylinder has an area of 10cm2 and a height of 1.0 m. The cylinder is composed of two different materials with mass densities of 2000 kg/m3 and 1500 kg/m3. If each of the two materials occupies an equal volume, what is the mass of the cylinder? Question 3 options: A) 3....
*August 8, 2011*

**PHYSICS - HELP**

I NEED HELP ON C THROUGH F. THANK YOU A spring id vertically, as shown below, and a 500g mass is hung from its lower end. The EQUILIBRIUM extension of the spring is observed to be 10.0cm. (1) What is the spring constant of the spring? ANSWER: 49N/m (B) If the is pulled down by...
*August 7, 2011*

**PHYSICS - HELP**

Two ingenious 120 student students decide to use an oscillating mass on a spring to check the shutter (exposure) time of their camera. They set up vertically alongside the mass and spring. A pointer attached to the mass allows the scale on the meter stick to be read as ...
*August 7, 2011*

**PHYSICS - HELP**

Two ingenious 120 student students decide to use an oscillating mass on a spring to check the shutter (exposure) time of their camera. They set up vertically alongside the mass and spring. A pointer attached to the mass allows the scale on the meter stick to be read as ...
*August 5, 2011*

**PHYSICS - HELP**

A spring id vertically, as shown below, and a 500g mass is hung from its lower end. The EQUILIBRIUM extension of the spring is observed to be 10.0cm. (1) What is the spring constant of the spring? ANSWER: 49N/m (B) If the is pulled down by 5.00cm and released, what is the ...
*August 5, 2011*

**PHYSICS -HELP**

A traverse periodic wave described by the expression y=5sin (pi x/3 - 30pi t) (where y and x are in meters and t is in seconds) is established on a string. By reflecting this wave from a rigid support, standing transverse waves are set up on a stretched string. It is observed ...
*August 5, 2011*

**PHYSICS**

Two ingenious 120 student students decide to use an oscillating mass on a spring to check the shutter (exposure) time of their camera. They set up vertically alongside the mass and spring. A pointer attached to the mass allows the scale on the meter stick to be read as ...
*August 4, 2011*

**Physics**

A spring id vertically, as shown below, and a 500g mass is hung from its lower end. The EQUILIBRIUM extension of the spring is observed to be 10.0cm. (1) What is the spring constant of the spring? A: 49N/m (B) If the is pulled down by 5.00cm and released, what is the frequency...
*August 4, 2011*

**American history**

Nat Turner's Rebellion was a slave rebellion that took place in Southampton County, Virginia during August 1831. A: VIRGINIA
*August 4, 2011*

**Physics**

A spring id vertically, as shown below, and a 500g mass is hung from its lower end. The EQUILIBRIUM extension of the spring is observed to be 10.0cm. (I) What is the spring constant of the spring? (II) If the is pulled down by 5.00cm and released, what is the frequency of the ...
*August 3, 2011*

**Latin American History**

That is correct Government by "a few people" is called Oligarchy.
*August 3, 2011*

**Math**

In how many ways can 8 instructors be assigned to five sections of a course in mathematics?
*July 31, 2011*

**math**

A card is selected from a deck of 52 playing cards. Find the probability of selecting · a prime number under 10 given the card is a heart. (1 is not prime.) · a diamond or heart given the card is red. · a King, given that the card is not a spade. Show step...
*July 31, 2011*

**science**

how does social and cultural influences influence science education
*July 27, 2011*

**chemistry**

nonane has a density of 0.79 g/mL and boils at 151 celsius. will it float or sink in water (density of 1.00 g/mL)
*July 27, 2011*

**Math**

If the odds of winning a raffle are 12:258, what is the probability of winning? 12/270 12/258 258/270 258/12
*July 23, 2011*

**math**

Given p is true, q is false, and r is trus, find the truth value of the statement (~p^q)<->~r. Show step by step work.
*July 17, 2011*

**Truth tables**

How do I construct a truth table for (p v q)->~p
*July 16, 2011*

**economics**

company A plans to purchase a packaging machine worth 5 million to further fast and up the packaging of their product brand X. the purchase is intended to boost up the loosing sale of the said product which makes 10000 per year. the target of the company is to increase the ...
*July 8, 2011*

**algebra**

a ramp rises 2.3 ft vertically and 14.8 ft horizontally express the slope
*July 8, 2011*

**Earlychildhood education**

play interaction stratiges for Artist Apprentice,Peacemaker,Guardian of the gate,Parallel plsyer,spectator,Participant,matchmaker,Storyplayer,and play tutor.
*June 24, 2011*

**maths**

im writting a math examination tomorrow and i dont know anything im learning my heart out help!4xy-5+5x-4y
*June 20, 2011*

**Physics**

In one cycle a heat engine absorbs 450 J from a high-temperature reservoir and expels 290 J to a low-temperature reservoir. If the efficiency of this engine is 57% of the efficiency of a Carnot engine, what is the ratio of the low temperature to the high temperature in the ...
*June 19, 2011*

**Math**

rationalize the denominator 12 over 5 pie 90
*June 17, 2011*

**Math**

How do I graph .4x + y = 325,000
*June 16, 2011*

**ecology**

If you were trying to decide if an unknown organism is an archaebacterium or an eubactrium, you woul look at the ribosomes because?
*May 26, 2011*

**English**

Write the phonic concept which identifies the common sounds found in each group of words below. Do not identify each sound separately, merely indicate the single phonic concept presented in each closed sort. Consonants __________ 1. black, snake, small, test, steam __________ ...
*May 24, 2011*

**Algebra 1a**

What the answer for this? 3 more than the quotient of a number and 2
*May 18, 2011*

**Algebra 1a**

What the answer for this? 3 more than the quotient of a number and 2
*May 18, 2011*

**math help please !!!**

i really neeed help, i have no idea how to answer this question ! i tried everything i know! A stone is thrown off a cliff. it reaches a maximum height of 30m after 2 seconds, then falls into the water below. it hits the water after 5 seconds a) how high above the water is ...
*May 17, 2011*

**math**

really need help, i have no idea how to answer this question ! A stone is thrown off a cliff. it reaches a maximum height of 30m after 2 seconds, then falls into the water below. it hits the water after 5 seconds a) how high above the water is the cliff ( The maximum height ...
*May 16, 2011*

**math**

really need help, i have no idea how to answer this question ! A stone is thrown off a cliff. it reaches a maximum height of 30m after 2 seconds, then falls into the water below. it hits the water after 5 seconds a) how high above the water is the cliff ( The maximum height ...
*May 16, 2011*

**Math**

Given the following sets, select the statement below that is true A = {r,i,s,k,e,d}, B={r,i,s,e},C={s.i,
*May 16, 2011*

**math**

a farmer is building a fence around his yard. one side of the fence will be the side of his barn , the other three sides will be made of wood. He has enough materials for 120m of fence, what is the maximum area he can enclose ? what are the dimensions which give this area
*May 15, 2011*

**math**

i really need help, i have no idea how to answer this question ! A stone is thrown off a cliff. it reaches a maximum height of 30m after 2 seconds, then falls into the water below. it hits the water after 5 seconds a) how high above the water is the cliff ( The maximum height ...
*May 15, 2011*

**math**

a farmer is building a fence around his yard. one side of the fence will be the side of his barn , the other three sides will be made of wood. He has enough materials for 120m of fence, what is the maximum area he can enclose ? what are the dimensions which give this area
*May 14, 2011*

**Socials Studies**

In 1837, were the rebels justified in taking up arms against the official government?
*May 13, 2011*

**math**

Please complete each equation 1. 15k = (9 - _____)k 2. 3.6p - p = _____ - 0.4p 3. (8 + _____) * = 5m
*May 11, 2011*

**Calculus 3**

Find the average value of the squared distance between the origin and points in the solid paraboloid D={ (x,y,z): 0 ≤ z ≤ 4 - x^2 - y^2} I have no idea how to start this.
*May 6, 2011*

**psychology**

Thanks so much!!!! For being 100 % correct
*May 4, 2011*

**com155**

thank you. did i miss any adjectives?
*May 2, 2011*

**com155**

I recently decided to apply for a credit card. I have absolutly no credit. When I received my new credit card I was extremely excited. I thought I was going to be responsible with my new credit card but I was not. The first thing I did was go to the mall. Just two hours after ...
*May 2, 2011*

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