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December 20, 2014

Posts by Melissa


Total # Posts: 1,130

math
Matthew is riding a ferris wheel at a constant speed of 10km/h. The boarding height for the wheel is 1m, and the wheel has a radius of 7m. What is the equation for the function that describes Matthews height in the terms of time, assuming Matthew starts at the highest point on...
December 8, 2011

Math
The diameter of a car's tire is 60cm . While the car is being driven , the tire picks up a nail .How high above the ground is the nail after the car has travelled 1km
December 8, 2011

Biology
explain the process of adaptive radiation, and how are reproductive barriers important to speciation
December 8, 2011

World religions
For this project for school we have to represent the noble eightfold path ( right view) to canadian society , but i am so stuck , i dont really know anything that would make sense, any help would be great
December 3, 2011

chemistry
Calculate the pH of each of the following solutions. (a) 0.300 M propanoic acid (HC3H5O2, Ka = 1.3 10-5) (b) 0.300 M sodium propanoate (NaC3H5O2) (c) pure H2O (d) 0.300 M HC3H5O2 and 0.300 M NaC3H5O2
December 2, 2011

chemistry
The Ksp for silver sulfate (Ag2SO4) is 1.2 10-5. Calculate the solubility of silver sulfate in each of the following. A)water B)0.14 M AgNO3 C)0.33 M K2SO4 the answer in mol/L
December 2, 2011

math
how do u do lost digits?? my son has to do this for homework and we are both stuck on how to do this.
November 30, 2011

Statistics
The average hourly wage of employees in a large nationwide industry is $12.96. Assume the variable is normally distributed, with a standard deviation of $4.46. In a randomly selected sample of 10,000 such employees, how many of them (correct to the nearest hundred) would you ...
November 28, 2011

statistics
570 people were in a survey and 124 people said yes. What proportion of people said yes to 1 d.p
November 24, 2011

chemistry
Calculate the pH of a 0.063 M (C2H5)2NH solution (Kb = 1.3 10-3).
November 24, 2011

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

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