Thursday

September 3, 2015
Total # Posts: 83,820

**physics**

B = 10 log (1)
*September 3, 2015*

**physics**

5 = 10 log (y/100)
*September 2, 2015*

**Math**

A mechanic can do a job in 2hr. It takes his assistant 3hr to do the same job how long would it take them to complet the job if they worked together?
*September 2, 2015*

**Math (functions)**

Sorry the condition that must be satisfied is f(f(x)) = x for all x
*September 2, 2015*

**Math (functions)**

If we have the function f(x) = (ax + b) / (cx + d) with a,b,c,d real numbers for which values of a,b,c,d is the following true f(f(x)) for all x I do a whole lot of algebra and get that that a,b,c,d must satisfy some conditions : c*(a+d) = 0 (d^2) - (a^2) = 0 -b *(a+b) = 0 ...
*September 2, 2015*

**ms sue math help please or anyone**

Which sum will be irrational? (1 point) a.3 + 2 b.start root 19 end root plus start fraction 7 over 2 end fraction c Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. d. –6 + (–3.251) Which product will be rational? (1 point...
*September 2, 2015*

**Chemistry**

A store owner would like to install a red illuminated sign. However, when she goes to purchase the sign, the list only includes the types of gases used, rather than the colors they produce. Which gas (H, Kr, He, Ne, Xe, or Ar) would you suggest she buy? In lay terms, explain ...
*September 2, 2015*

**Chemistry**

Write a brief discussion of the relationship between the atomic spectrum (number and position of the lines) and the electronic structure (shell model) of the gases. I know that the bigger the atom, less energy and so does that have something to do with this question?
*September 2, 2015*

**French**

Are these sentences correct? J’aime jouer au basket le dimanche à deux heures de l’après-midi. J’aime courir le mardi à six heures du soir. J’aime écrire le mercredi à dix heures du matin. J’aime jouer au tennis le ...
*September 2, 2015*

**Chemistry **

Classify each of the following as a heterogeneous mixture (M) or homogeneous mixture (S)or compound (C) or element (E). oxygen dissolved in water - S carbon mixed with sand - M apple juice - S vegetable soup -M sour, curdled milk -M steel -S hydrogen -E salt -E distilled water...
*September 2, 2015*

**help please with math thanks**

Which sum will be irrational? (1 point) a.3 + 2 b.start root 19 end root plus start fraction 7 over 2 end fraction c Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. d. –6 + (–3.251) Which product will be rational? (1 point...
*September 2, 2015*

**Algebraic word problem damon or steve plz interven it urgent**

i wil do dat,here is anoda.john is twice as old as his friend peter.peter is 5year older than alice.in 5years.john wil be three times as old as alice,how old is peter nw
*September 2, 2015*

**math help ms sue please**

2nd A 17 point Modifying Above 12 with bar times 33 B start root 3 end root times start root 9 end root C 4 times pi D negative start root 20 end root times 15
*September 2, 2015*

**math help ms sue please**

ima get to the others one min
*September 2, 2015*

**math help ms sue please**

1st a 3 + 2 b start root 19 end root plus start fraction 7 over 2 end fraction c Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. d –6 + (–3.251)
*September 2, 2015*

**math help ms sue please**

k will soon srry thankjs though
*September 2, 2015*

**can anyone help me**

can anyone help me
*September 2, 2015*

**math help ms sue please**

Which sum will be irrational? (1 point) 3 + 2 start root 19 end root plus start fraction 7 over 2 end fraction Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. –6 + (–3.251) Which product will be rational? (1 point) 17 ...
*September 2, 2015*

**Math**

I assume that since you put 680 m there, the bike must have traveled 680 meters in 50.4 seconds. However, it is supposed to be 680/50.4, so 680/50.4 is approximately 13.49 mps. Your answer is correct, but change your work.
*September 2, 2015*

**Math**

Post the entire question. The question isn't complete; we don't know all the measurements(numbers) that way.
*September 2, 2015*

**math help please**

Which sum will be irrational? (1 point) 3 + 2 start root 19 end root plus start fraction 7 over 2 end fraction Start Fraction 18 over 3 End Fraction plus Start Fraction 11 over ten thousand End Fraction. –6 + (–3.251) Which product will be rational? (1 point) 17 ...
*September 2, 2015*

**Pre-Calc**

Find the degree measures of the radians given. 1. pi/15 rad = 12 degs 2. -9pi/2 = -810 degs 3. 5pi/3 = 300 degs 4. -3pi/4 = -135 degs 5. pi/10 = 18 degs 6. -11pi/15 = -132 degs 7. In which quadrant is -11pi/9? = quadrant 2 8. Find one positive and one negative coterminal angle...
*September 2, 2015*

**Math**

Its B)112
*September 2, 2015*

**Math**

Which one do you think it is?
*September 2, 2015*

**Pre-Calc**

Is 300 an angle between 0 and 360 degrees that is coterminal with -780 degrees?
*September 2, 2015*

**Social Studies**

Ok, Thank You so much!!!!
*September 2, 2015*

**Social Studies**

The Dutch ??
*September 2, 2015*

**Social Studies**

Use the quote to answer the question: "The natives are too happy to share…… for a copper kettle and a few toys, as beads and hatchets, they will sell you a whole Country…." Which European power was able to purchase a valuable island with "a few ...
*September 2, 2015*

**science**

when kcn reacts with nh4cl to give
*September 2, 2015*

**Reading**

In which sentence is the word periscope used correctly? A. Excited about her finding, the scientist used a periscope to view the organisms in the water sample.**** B. On the night of the full moon, we used the periscope to look at the sky. C. Sitting behind the tall stone ...
*September 2, 2015*

**life orientation grade 11**

social and environmental responsibility (environmental issues that cause ill - health
*September 1, 2015*

**math **

For positive integers x and y, x+y=21. What is the smallest possible value of xy? a.10 b.20 c.38 d.54 e.110
*September 1, 2015*

**MAT 221**

If 6 pens cost d dollars, how much, in dollars does each cost.
*September 1, 2015*

**Math**

Would two coterminal angles for -13pi/6 be -25pi/6 and 11pi/6?
*September 1, 2015*

**math**

Three hundred ten million,seven hundred sixty three thousand one hundred thirty six. And the other is 20,000,000 + 400,000 + 80,000 + 4,000 + 100 + 60 + 3
*September 1, 2015*

**algebra**

How do you calculate the rate of 40 cars parked in 6 rows in a parking lot
*September 1, 2015*

**Chemistry**

Thank you for your help
*September 1, 2015*

**Chemistry**

ok so for wavelength I get 6.058x10^-7 then I divide: 2.998x10^8 / 6.058x10^-7 and get 4.949x10^14 Hz Is this correct?
*September 1, 2015*

**Chemistry**

Oh is it 1.816x10^2? I divide the speed of light by the wavelength: 2.998x10^8 / 1,650,763.73 I did the reverse the first time. Is this correct now?
*September 1, 2015*

**Chemistry (Please check my answer)**

I got 5.506x10^-3 when I divide the wavelength by the speed of light but I don't think that's right because Kr is an isotope. Could you please explain how this works too?
*September 1, 2015*

**Chemistry**

The meter has been defined as 1,650,763.73 wavelengths of the orange-red line of the emission spectrum of ^86Kr. Calculate the frequency of this radiation. In what proportion of the electromagnetic spectrum does the radiation fall?
*September 1, 2015*

**Pre-Calculus**

???
*September 1, 2015*

**Pre-Calculus **

focus at (-2,0) directrix the line x=2
*September 1, 2015*

**Science**

look, i just need one example you don't have to like that, and second this is on a test and just like you i don't have much time to be here all day
*September 1, 2015*

**Science**

Using an example, explain how being able to understand scientific principles and think scientifically can help you solve problems and answer questions in your everyday life.
*September 1, 2015*

**Science**

Using an example, explain how being able to understand scientific principles and think scientifically can help you solve problems and answer questions in your everyday life.
*September 1, 2015*

**math**

5,10,20,40,__,___,___,___
*September 1, 2015*

**Algebra**

Write a algebraic equation Ron is 10 years younger than maria. If maria is 'n' years old, how old is Ron
*August 31, 2015*

**Chemistry**

Suppose that 2.091x10^-18 J is absorbed by the electron of a hydrogen atom in the n=1 energy state. Describe the final energy state of the atom.
*August 31, 2015*

**math**

660/60 = ft/s
*August 31, 2015*

**Chemistry**

How much energy in joules is required to change the energy state of the H-atom electron from n=2 to n=3? from n=2 to n=4? from n=2 to infinity? Kind of confused on this concept. Could you please explain for me? Thanks
*August 31, 2015*

**math**

Cherish planted 12 flowers. She put the same number of flowers in each row. Draw a picture to show how she planted her flowers. Write an addition sentence to match your problem
*August 31, 2015*

**Math**

100 milk cartons were put out for breakfast. At the end of breakfast ony 27 remained what is the ratio of milk cartons taken to total milk cartons
*August 31, 2015*

**Science**

i did and there was no help from it
*August 31, 2015*

**Science**

1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly.*** Scientists use models of natural systems because they like to use art in science. ...
*August 31, 2015*

**science**

1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
*August 31, 2015*

**science**

1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
*August 31, 2015*

**chem**

12.16 mL of 0.205 M thiosulfate are required to reach the endpoint in the titration of 2.26 g of bleach sample
*August 31, 2015*

**math accounts economics**

what job can I get with these subjects
*August 31, 2015*

**physic**

A 1.2-kilogram basketball travelling at 7.5 meters per second hits the back of a 12-kilogram wagon and bounces off a 3.8 meters per second, sending wagon off in the original direction of travel of the ball. How fast is the wagon going?
*August 31, 2015*

**Chemistry**

If the H-atom electron in the n=1 state absorbs energy equivalent to 2.178x10^-18 J, what energy state will it occupy?
*August 30, 2015*

**physics **

A system does 137 J of work on its environment and gains 95.3 J of heat in the process. Find the change in the internal energy of (a) the system and (b) the environment
*August 30, 2015*

**Plus**

569 times 12
*August 30, 2015*

**physics**

Water at 29.0 °C is sprayed onto 0.188 kg of molten gold at 1063 °C (its melting point). The water boils away, forming steam at 100.0 °C and leaving solid gold at 1063 °C. What is the minimum mass of water that must be used?
*August 30, 2015*

**Calculus**

Differentiate y=[(8x-x^6)/(x^3)]^(-4/5) My answer: [4x^3(16+3x^5)]/5 • fifth root of [(8x-x^6)/(x^3)] ^9
*August 30, 2015*

**Calculus**

Differentiate e^cos (x^2+1). My answer: -2xe^cos(x^2 +1) • sin(x^2+1)
*August 30, 2015*

**geometry**

ugh.. it didnt turn out to be boxes..
*August 30, 2015*

**geometry **

So On the first day of school I went to geometry and we did a review. My teacher had us work out this problem and I've never seen it before. Other kids were doing the problem and I was just there confused. I was embarrassed and didn't want to ask for help. Do any of ...
*August 30, 2015*

**world history **

why might a person say aristotle is the most modern of the ancient greek philosophers?
*August 30, 2015*

**Calculus**

Find the equation of the tangent line to f(x)=sec x - 2 cos x at (pi/3, 1).
*August 30, 2015*

**Calculus**

Differentiate. f(x)=(cos x)/x I got to here: (-x sin x - cos x)/x^2
*August 30, 2015*

**intro to digital tech**

. Come up with an Invention that may impact/change the world 50 years from today. Get creative and think outside the box. Do your research to think of an idea that would really help change/impact the world positively. 2. Write about the following in detail: a. What is the ...
*August 30, 2015*

**Math**

On Saturady, Emily made 10 times as much as on Monday. How much money did Emily Collect on Monday?
*August 30, 2015*

**physics**

a men in circus shows jump from a height of 10m &caught by net spread below the net sag 2m due to its impact.find avgforce exerted by net on man to stop hiss fall .takeamassofman60kg and acceleration10m/s2
*August 29, 2015*

**physics**

a men in circus shows jump from a height of 10m &caught by net spread below the net sag 2m due to its impact.find avgforce exerted by net on man to stop hiss fall .takeamassofman60kg and acceleration10m/s2
*August 29, 2015*

**Chemistry**

Use v0= vmax*[S]/(km+[S]) where v0= 1/10*vmax km= 1/2vmax plug and chug, solve for vmax and plug into km=1/2vmax equation to get km
*August 29, 2015*

**Calculus**

Differentiate. f(x)=(cos x)/x I got to here: (-x sin x - cos x)/x^2 Find the equation of the tangent line to f(x)=sec x - 2 cos x at (pi/3, 1). Is the slope 3 times sqrt of 3? Equation is y=3 times sqrt of 3x - pi times sqrt of 3 +1??
*August 29, 2015*

**Calculus**

Find the equation of the tangent line to f(x)=x sec x at (pi/4, pi •sqrt of 2 all over 4). I got to here, but did not know what to do next: slope: (pi/4)(sqrt of 2 over 2) + (sqrt of 2 over 2) everything over 1/2=.......
*August 29, 2015*

**world history **

why might a person say aristotle is the most modern of the ancient greek philosophers?
*August 29, 2015*

**Calculus**

Find the derivative. d/dx[sqrt of x (x^3 +1)] My answer in its most simplified form: (7x^3 + 1)/ 2 • sqrt of x
*August 29, 2015*

**Math**

Problem 3) Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their ...
*August 29, 2015*

**calculus**

R is the first quadrant region enclosed by the x-axis, the curve y = 2x + b, and the line x = b, where b > 0. Find the value of b so that the area of the region R is 288 square units.
*August 29, 2015*

**Algebra**

Write each expression in radical form. 1. (10n)^3/2 My answer: sqrt of 10n to the power of 3 Could it be simplified further to 10n times sqrt of 10n? 2. a^6/5 My answer: the fifth root of a to the power of 6 Could it be simplified further to "a" times the fifth root ...
*August 29, 2015*

**english**

ok thx
*August 29, 2015*

**english**

so B
*August 29, 2015*

**english**

Which is a complete sentence? a. Jordan Pond House was destroyed by fire in 1979. b. Seal Harbor for popovers and fruit ice cream. c. Two campgrounds inside the park, Blackwoods and Seawall. d. For the future of the site, restoration of the Rambling Inn. need help please
*August 29, 2015*

**calculus**

The base of a solid is bounded by the curve y= sort (x+2) ,the x-axis and the line x = 1. The cross sections, taken perpendicular to the x-axis, are squares. Find the volume of the solid.
*August 29, 2015*

**calculus**

Find the domain for the particular solution to the differential equation dx/dy=1/2x, with initial condition y(1) = 1.
*August 29, 2015*

**P.E.**

Ohhhh.. sorry i was wrong, oppps..... Anyway i think it is Jogging regular with friends
*August 29, 2015*

**P.E.**

Which of the following habits will help you stay on the "wellness end" of the health continuum? Staying up to late and not getting enough rest*** Going on a calorie-limiting diet Jogging regular with friends Going to the movies
*August 29, 2015*

**P.E.**

I googled it and i think i'm right. Thanks soo much:)
*August 29, 2015*

**P.E.**

Which side of the health triangle corresponds to having loving relationships with other and giving and accepting help? Physical health Mental and emotional health***??? Social health none of the above
*August 29, 2015*

**Science**

Thanks I'm done
*August 29, 2015*

**Science**

1)A scientist at a chemical company designs and conducts an experiment to determine if a chemical made by the company is harmful to crops. To do this, he sprays the chemical on three plants he has in the laboratory. None of the plants survive. The scientist reports that the ...
*August 29, 2015*

**physics**

A stone is dropped into a well and the sound of the splash is heard after 3.91 seconds. If the depth of the well is 67.7 meter, find the velocity of sound???
*August 29, 2015*

**Calculus**

Let f be a function defined for all real numbers. Which of the following statements must be true about f? Which might be true? Which must be false? Justify your answers. (a) lim of f(x) as x approaches a = f(a) (b) If the lim of f(x)/x as x approaches 0 = 2, then f(0)=0. (c) ...
*August 28, 2015*

**Math **

Simplify by writing each fraction in lowest terms: X^2-y^2/(x-y)^2 My work: X^2-y^2/(x-y)^2 =X^2-y^2/(x-y)(x-y) =X^2-y^2/x^2-2x2y-y^2 I don't know what to do next.
*August 28, 2015*

**English**

I have to write a thematic essay and a characteristic essay. I have a few questions in the writing. I am in grade 11 right now. 1) what should I include in the introduction? Whenever I write anything about the story, my tutor says that is summarizing and I should not do that ...
*August 28, 2015*