Sunday

December 4, 2016
Total # Posts: 831

**math**

1/2 is the same as .5 and 50% 2/5 is the same as .4 and 40% fractions, decimals and percentages are all interchangeable, however percentages are generally just used in charts for a marketing group to understand (they like percents better).

*December 19, 2011*

**chemistry**

metals have lots of free or lose electrons that allows the energy to move freely while insulators electrons are tightly bound and don't allow for lots of energy movement

*December 19, 2011*

**Ap calc**

A particle moves on the x axis so that it's position at any time t is greater than or equal to 0 is given by x(t)=2te^-t. A) find velocity for any t is greater or equal to 0

*December 19, 2011*

**Calculus**

If x^3 = 1 and x does not equal 1, x(x+1)= ?

*December 16, 2011*

**Statistics**

The lifetime of a certain smart phone battery has an unknown distribution with mean value of 8 hours and standard deviation of 2 hours. What is the approximate probability that the average battery lifetime of a sample of 36 batteries will exceed 8.1 hours?

*December 12, 2011*

**Statistics**

The lifetime of a certain smart phone battery has an unknown distribution with mean value of 8 hours and standard deviation of 2 hours. What is the approximate probability that the average battery lifetime of a sample of 36 batteries will exceed 8.1 hours?

*December 12, 2011*

**Physics**

0.014s

*December 9, 2011*

**precalculus**

State the parent function that must be transformed to create the graph of y=2/3x^3 - 2. Describe the transformation that must be applied to the parent function. Parent function= x^3 I don't know the transformation...

*December 8, 2011*

**Math**

Explain how you can determine if a linear factor of a function is squared or cubed by examining the graph of the function. Halp I don't know :|

*December 8, 2011*

**Math**

Can someone help me with these T.T 1.Which polynomial function would have the end behaviour of as x-> -∞, y= +inf and as x-> ∞, y-> -∞? a) f(x) = -6x^4 - x^5 + 5x^3 - x^2 - 4x + 9 b)f(x)= 6x^4 + x^5 - 5x^3 + x^2 + 4x - 9 c)f(x) = 3x^2 + x - 11 d)-2x^...

*December 8, 2011*

**social studies**

what was the boston massacre

*December 8, 2011*

**Math**

Some students might argue that if you know how to factor a sum of cubes, then you do not need to know how to factor a difference of cubes. Explain why you agree or disagree.

*December 7, 2011*

**Math**

A rectangle with vertices at (2,5), (7,5), (7,8) and (2,8) is revolved around the line y=5 to obtain a cylinder. What is the volume of the cylinder? Express your answer in terms of pi.

*December 6, 2011*

**Math**

Explain how to determine the value of x that gives a maximum for a transformed cosine function in the form y=acos(k(x-d)) + c, a>0, if the maximum for y=cosx occur at (0degrees, 1)

*December 5, 2011*

**Physics**

A ball of mass 5.3 kg and radius 8 cm rolls without slipping horizontally at 4.3 m/s and hits a spring attached to a wall. What is the maximum change in length of the spring if the spring constant k=41100N/m? (Assume the floor is frictionless)

*November 18, 2011*

**Physics**

A Ferris wheel with radius 11.0 m rotates at a constant rate, completing one revolution every 33.9 s. Suppose the Ferris wheel begins to decelerate at the rate of 0.227 rad/s2 when a passenger is at the top of the wheel. Find the magnitude and direction (in degrees below ...

*November 18, 2011*

**Pre Calc**

sec(cos-1 (4/5))=?

*November 15, 2011*

**Pre Calc**

tan(tan-1 7.4)=?

*November 15, 2011*

**Accounting**

Because DeVry is asking you this question in this week's discussion...seriously, do the research yourself...see you in the threads!

*November 6, 2011*

**derivatives**

How do I find the 2nd derivative of x^(-1/15)

*November 4, 2011*

**consumer mathB**

Your box of raisin bran cost $1.89 last year. This year it costs $2.25. What is the inflation rate?

*November 3, 2011*

**Chemistry**

Obtain the radius of a sphere of zinc if its mass is 0.23 mg. The density of zinc is 7.14 g/mL. The given formulas are: d=m/v v=(4/3)pi r^3

*November 3, 2011*

**chemastrey**

of exhow many grams of no2 can be produced by the reaction of excess o2 with 19.8 of no

*November 1, 2011*

**SCIENCE**

Last one. What is the first element on the periodic table? I already answered these questions but I'm making sure they are correct:D Thanks

*October 27, 2011*

**SCIENCE**

K is the chemical symbol for which element?

*October 27, 2011*

**SCIENCE**

What is the name of the 2nd biggest planet in our solar system?

*October 27, 2011*

**Science 6TH Grade**

ffefeffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff

*October 26, 2011*

**MATHES**

0.7M

*October 16, 2011*

**World History**

a.kush

*October 13, 2011*

**chemistry 12**

i got K= (HOBr2)(OH)/(HOBr) 2.0x10^-9 = (x)(x)/0.18M x= 11x10^-6 (OH-) =11x10^-6 (H3O)= 1.0x10^-14/11x10^-6 =9.0x10^-8

*October 5, 2011*

**chemistry 12**

Calculate [H3O+] and [OH-] in 0.18M hydrobromic acid, HOBr(aq), having a K of 2.0x10^-9? I got 9.0x10^-8

*October 5, 2011*

**chemistry 12**

What i got was : a) K = (3.0x10^-6)(0.12)/(0.12)(0.12)= 0.6 b) i got 1.90%

*October 5, 2011*

**chemistry 12**

A) Calculate [OH^-] in a o.12 M solution of hydrazine, H2NNH2(aq), having K of 3.0x10^-6. B) what is the percent ionization of the H2NNH2(aq) I can't get these for the life of mee!

*October 5, 2011*

**Math**

On Friday, Jan hiked in the woods. If she hiked a vertical distance of 60 meters relative to sea level and then down 86 meters, where would she be relative to sea level if she started at 0?

*October 5, 2011*

**Math**

On Friday, Jan hiked in the woods. If she hiked a vertical distance of 60 meters relative to sea level and then down 86 meters, where would she be relative to sea level if she started at 0?

*October 5, 2011*

**science**

why are minerals important and what are 2 examples

*September 27, 2011*

**ENG**

how to write a article review ?

*September 26, 2011*

**Math**

There are one thousdand students in Central High School. Three hundred twenty-eight of the students are seniors. Write the decimal that shows what part of the student body is in the senior class.

*September 23, 2011*

**math/geometry**

A football isnt a sphere

*September 21, 2011*

**algebra**

After m minutes an adult blikns about 10+3times.about how many times does an adult blink in three minutes? in two hours?

*September 15, 2011*

**math please help me**

18n-20 = 36-10n then what is n? please please help me

*September 7, 2011*

**5th Grade Math**

you want to estimate 5.25 - 3.3. why would using front-end estimation and adjusting tell you more about the answer than rounding?

*September 6, 2011*

**geometry**

Given that Vector BD Angle ABC, Measures Of Angle ABC =6x - 12, And Angle = 72 Degres, Which Equations Could Be Used To Find The Value Of X? A - 6x - 12 = 72 B - 1/2 (6x-12) = 72 C - 2(6x - 12 = 72 D 6x - 12= 2(72) Can Anyone Help Me How To Solve Or Help Me On Anything

*September 2, 2011*

**geometry**

Use formulas to find the lateral area and surface area of the given prism. The base of the prism is the rectangle with sides of length 13m and 5m. Show your answer to the nearest whole number.

*August 9, 2011*

**Math - Calculus**

I don't understand? Can you please explain?

*July 17, 2011*

**Math - Calculus**

Find the equation of the non-vertical asymptote. What is the smallest value of x at which f(x) intersects its? -6x^3 + 2x^2 - 9x +3 / -5x^2 +9x - 4 1)Find the equation of the non-vertical asymptote. 2)What is the smallest value of x at which f(x) intersects its non-vertical ...

*July 17, 2011*

**Chemistry**

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

*July 11, 2011*

**English**

im english

*June 23, 2011*

**Reading**

Which word from the choices below is described the poem that follows? We start escaping this when we Sing "A-B-C-D-E-F-G." That song is not enough, and yet The first step is the alphabet! a. aristocrat b. illiteracy c. aura d. essence Help if you can

*June 19, 2011*

**Reading **

Woops sorry and thanks lol

*June 16, 2011*

**Reading **

Poem "A Voice," By Pat Mora How do you interpret the speaker's statement that her mother's breath "moves through the family like the wind moves through the trees

*June 16, 2011*

**Social Studies**

What Indian tribe helped Lewis and Clark build a canoe?

*June 1, 2011*

**Statistics**

Use the multiple regression equation to predict a persons salary. Assume that the variable A is the number of years of college. Assume that the variable B is the number of years of experience. Suppose the person has 7 years of college and 3 years of experience. What should ...

*May 20, 2011*

**physics hw urgent please **

show how you would you arrange to find f in terms of v,m and r from four equations below. f=1/t, f=ma,v=2piR/T,a=v^2/R Thanks

*May 14, 2011*

**chemistry**

what are the acids, bases, conjugated nacids and conjugated bases of the equation H2O+H2O->OH-+H3O?

*May 5, 2011*

**MATHS**

i need majer help man

*May 4, 2011*

**math**

find the axis of symmetry f(x)=-2x2-12x+8find the axis of symmetry f(x)=-2x2-12x+8

*May 3, 2011*

**Algebra**

Pauline sells computers on commission. She spends 2 hours on selling a laptop and 1 hour on selling a desktop computer. She works no more than 40 hours per week and routinely sells at least 1 laptop and at least 4 desktops each week. To maximize her income, how many of each ...

*April 26, 2011*

**Math**

Math.. find limit help? Find the given limit. (x→ 1)lim: (square root x-1) + 1

*April 26, 2011*

**Math**

First find the general derivative of f (x) = (√x −1) . Then find the equation of the tangent line to the graph at x = 10.

*April 26, 2011*

**algebra**

Part $30000 is invested at 6% another part at 7% and the remainder at 8% yearly interest the total yearly income from the 3 investments is $2200

*April 24, 2011*

**algebra**

Melinda invested three times as much money at 9% yearly interest as she did at 7%. her total yearly interest from the two investments was 170$ How much did she invest at each rate Thanks !!

*April 24, 2011*

**Algebra**

X+y+z=2200

*April 24, 2011*

**Algebra**

Not really having trouble with this one for some reason

*April 24, 2011*

**Algebra**

Sam invested $1950 part of it at 6% and the rest at 8% yearly interest. The yearly income on the 8% invest was 6$ more then twice the income from the 6% investment. how much did he invest at each rate

*April 24, 2011*

**Math**

Of the first graders who were asked, 1/6 like math best, 2/3 liked reading best, and 12 liked science best. How many were asked their favorite subject?

*April 15, 2011*

**Math**

Of the first graders who were asked, 1/6 like math best, 2/3 liked reading best, and 12 liked science best. How many were asked their favorite subject?

*April 15, 2011*

**PHYSICS **

A space station consists of two donut-shaped living chambers, A and B, that have the radii shown in the drawing. As the station rotates, an astronaut in chamber A is moved 3.18 102 m along a circular arc. How far along a circular arc is an astronaut in chamber B moved during ...

*April 2, 2011*

**math**

what household items come in fourths or halves?

*March 31, 2011*

**Math**

second one

*March 30, 2011*

**Math**

how do you solve: m=a+b/2

*March 30, 2011*

**science**

A cylindrical bottle of oil-and-vinegar salad dressing whose volume is 1/3 vinegar (p=1.01 g/cm^3) and 2/3 oil (p=.910 g/cm^3) is at rest on a table. Initially the oil and the vinegar are separated, with the oil floating on top of the vinegar. The bottle is shaken so that the ...

*March 29, 2011*

**Physics**

two point masses are located in the same plane. the distance from mass 1 to the center of mass is 3.0m. The distance from mass 2 to the center of mass is 1.0m. What is m1/m2, the ratio of mass 1 to mass 2?

*March 29, 2011*

**Math**

how did you get 114???

*March 29, 2011*

**Math**

A circular garden has an area of 25π m2 If the . radius is increased by two meters, and fencing is sold only in one meter sections, how much fencing is needed to keep out the rabbits?

*March 29, 2011*

**Math**

man than i must such at math than...oh well sorry megan .

*March 29, 2011*

**Math**

the percent i think is because in the early days the price wasn't that high or expensive as today. my bad, heres my other, i think, ummm.... to start 10000 so if you add 10000 to 25000= 35000 then, 35000+89000=124000 nest, 124000+265000=389000 i'm guessing the total ...

*March 29, 2011*

**Math**

i'm guessing to Megan that it is 717.7%???

*March 29, 2011*

**Math**

just wondering...

*March 29, 2011*

**Math**

so than... 70's to 80's - 265000 increase 265000/124000=2.137= 213.7% Right?

*March 29, 2011*

**Math**

How do you know how many units are spread between the intervals? (For instance, 120-129, 130-139, units spread by 10) How would we answer this question? Thirty AA batteries were tested to determine how long they would last. The results, to the nearest minute, were recorded as ...

*March 27, 2011*

**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 ...

*March 23, 2011*

**Math**

What is the difference between a linear and a quadratic model? How do I know which one is good for the graph? :S I know it has to do with equations to find R2

*March 20, 2011*

**Algebra**

Factor completely and then place the factors in the proper location on the grid. 4y2 + 25y + 6

*March 17, 2011*

**Algebra**

Laura has a roll of ribbon. There are 20 yards of ribbon on the roll. What equation can Laura use to find the number of inches of ribbon on the roll

*March 10, 2011*

**Math**

Do you suggest any other topics that has a lot of information?

*March 8, 2011*

**Math**

I was assigned an ISU for Data management. In first part, it requires a thesis (Example: Why do teenagers pay so much for car insurance?), hypothesis and 3 main points to back up thesis. I told my teacher that I wanted to do about death rates, what factors cause death rates in...

*March 8, 2011*

**Math**

Consider every whole number area from 2 square units to 30 square units. For which of these areas is there only one rectangle with whole number side lengths?

*March 7, 2011*

**Math**

Consider every whole number area from 2 square units to 30 square units. For which of these areas is there only one rectangle with whole number side lengths?

*March 7, 2011*

**Math**

Consider every whole number area from 2 square units to 30 square units. For which of these areas is there only one rectangle with whole number side lengths?

*March 7, 2011*

**accounting**

purchases from xavier corporation were incorrectly recorded at 41,000 instead of 14,000. Should we adjust purchases and accounts payable?

*March 6, 2011*

**Math**

Ah, ok thank you!

*March 6, 2011*

**Math**

Thank you! I think I did this before but I forgot... How do you know whether or not to use those formulas in these kind of questions? rearrange formulas? P(A U B) = P(A) + P(B) - P(A and B) and P(A U B) = P(A) + P(B)

*March 6, 2011*

**Math**

Thanks! T___T another question (Last one I promise, lol) The probability of a household subscribing to The Economist is 0.4 while the probability of subscribing to National Geographic is 0.6, and the probability of subscribing to NEITHER magazine is 0.2. What is the ...

*March 6, 2011*

**Math**

If possible, can you help me with this question also? From a group of 10 girls and 10 boys, 10 will be chosen to form a committee. Find the probability that atleast ONE GIRL is chosen. I did it like this At least 1 girl so therefore I separated more than 1...

*March 6, 2011*

**Math**

So, for b it is (4,3)(4,4) + (4,2)(4,1)/(8,5)= 28/56= 1/2?

*March 6, 2011*

**Math**

2a) (4,1)x(4,4)/ (8,5)=4/56 For 2a, why is student 4,4? I don't understand that. I know that for 1 teacher, there is 4 student because there is 5-person committee. I don't know question b.

*March 6, 2011*

**Math**

Find the probability of: a) Rolling a three OR a six with a single die Answer: P(3 U 6)= n(3U6)/n(S) = 3+6/6 = 9/6 reduced: 3/ b) Dealing an ACE OR a FACE CARD from a standard deck Answer: P(A U F)= 4/52 + 12/52 = 4/13 2. A 5-committee is to be chosen from 4 teachers and 4 ...

*March 6, 2011*

**Math**

How many distinct permutations of the letters of the word OTTAWA being and end with the letter T? I did 6!/2! :S but i get 360. I tried 6P2=30 I am getting it wrong... help please.

*March 3, 2011*

**physics**

You push a 1.9 kg block against a horizontal spring, compressing the spring by 13 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 60 cm from where you released it. The spring constant is 200 N/m. What is the block-table coefficient ...

*February 14, 2011*