# Posts by Melissa

Total # Posts: 1,305

**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*

**Math !!!!! 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*

**statistics**

5.00

*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 through each array and outputs their contents to the immediate window. Then the exit button displays the number of ...

*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 don't 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*

**Chemistry**

How many grams of copper are produced when excess aluminum reacts with 11.6g of copper oxide?

*April 26, 2011*

**Spanish**

Question answers: 15. A 16. D 18. D 19. B 21. B

*April 26, 2011*

**bowie**

answer to 5(2x-3) 8=9 in a fraction

*April 25, 2011*

**Statistics**

Outliers are often easy to spot in histograms...my question is can a historgram have more than one outlier.

*April 19, 2011*

**English**

thank u guys

*April 19, 2011*

**English**

Which of the following should NOT be capitalized? A. Europe B. the Earth C. Far East D. the South Atlantic I think it's B?

*April 19, 2011*

**english**

thank u

*April 19, 2011*

**english**

1. An analogy helps clarify a complex idea by: A. presenting several definitions of the idea. B. comparing the idea with a simpler one C. breaking down the idea into smaller pieces D. pointing our a single common trait between two topics. I think it's B? 2. Which of the ...

*April 19, 2011*

**English**

thank u

*April 19, 2011*

**English**

Your conclusions are faulty in a cause-and-effect essay if: A. you include secondary effects B. you include only short-term effects C. you distinguish between long-term effects and short-term effects D. you include primary effects I believe it's B?

*April 19, 2011*

**geometry**

A polygon has d diagonals. If the polygon had one more side, it would d + 10 diagonals. How many sides does the polygon have?

*April 13, 2011*

**Math**

How much surface area would 1 fluid oz. of gold cover? Thickness .0002 (two Tenths)

*April 12, 2011*

**Spanish 8th grade-Please check answer**

Thank you

*April 12, 2011*

**Spanish 8th grade-Please check answer**

Is this correct the way I answered this-I don't like onion cake so I'm telling them Sorry,but I don't like it. ¿Quieres comer pastel de cebollas conmigo? Lo siento pero no, no me gusta pastel de cebollas. Thank you

*April 12, 2011*

**Spanish 8-Please check**

Thank you

*April 11, 2011*

**Spanish 8-Please check**

1.Which one is correct? Tocamos el piano. Jugamos el piano. Tocamos al piano. I think it is the Tocamos el piano because if it was jugamos then it would have to have "al" in front of piano. Piano is masculine so it couldn't be Tocamos al piano. 2. Which is ...

*April 11, 2011*

**Spanish -8th grade- Please check**

Which of the following is correct? Mis hermanos tocan a la guitarra. Mis hermanos tocan la guitarra. Mis hermanos juegan la guitarra. I think it is "Mis hermanos tocan la guitarra."

*April 11, 2011*

**Physics-Please check**

We're just learning this and I think I mixed up G=6.673E-11 from another problem and what my brother was telling me to simply do mass of electron * 9.8N/kg. I was accidentally combining two differnet things and not doing it correctly sorry for not understanding it right ...

*April 10, 2011*

**Physics-Please check**

I'm trying to find the gravitational force of an electron at earth's surface. I know I say Fg = mass electron * gravity Gravity in this case is 6.673*10-11 m^2/kg^2 correct, not 8.93 * 10^-30N that we used for force of acceleration, right. I use the universal constant ...

*April 10, 2011*

**Statistics**

What score in a distribution that has a mean of 500 and a standard deviation of 100, would identify the top 60% of scores?

*April 9, 2011*

**math**

If there are only two cards left it would be a 50% chance of picking the Queen of Hearts.....

*April 8, 2011*

**Geometry**

a(-2,-3)

*April 7, 2011*

**calculus**

f(x)= x^3/(2x-5)^4

*April 6, 2011*