Friday

August 29, 2014

August 29, 2014

Total # Posts: 3,938

**Trigonometry - Proofs**

Prove that the average of the numbers n sin (n degrees) (n = 2, 4, 6, ... 180) is cot (1 degree) Hint: Express everything in terms of sin and cos. Can you rearrange the result into a form that allows you to use some of the identities you've learned? How to start? I know I ...
*November 12, 2013*

**supply chain**

Suppose that a manufacturer of men's shirts can produce a dress shirt in its Houston, Texas, plant for $8 per shirt (including the cost of raw materials). Chicago is a major market for 100,000 shirts per year. The shirt is priced at $15 at Houston. TransportaÂ¬...
*November 8, 2013*

**Physics Classical Mechanics**

Please don't spam post all your questions: we probably won't answer you. Also, could you tell us how much you have worked on these problems?
*November 7, 2013*

**Math**

2/3 = 12/x corss multiply we get 2x = 36 x = 18 6/11 = 84/x cross multiply we get 6x = 11 * 84 x = 154 same thing for 3, 22h = 55*12 2 h = 5*12 h = 30
*November 7, 2013*

**Math-Trigonometry**

THAT HELPED ALOT THANKS
*November 7, 2013*

**Math-Trigonometry**

Show that if x, y, and z are consecutive terms of an arithmetic sequence, and tan y is defined, then (sin x + sin y + sin z) / (cos x + cos y + cos z) = tan y. So I tried letting x = y-k (since x,y,z are consecutive terms of an arithmetic sequence), then z= y+k So we get (sin(...
*November 7, 2013*

**BUSINESS MATH**

9.8 * 40 + 9.8*1.5*4
*November 7, 2013*

**Math**

a. 1 - (1/2 * 1/2 *1/2 + 1/2*1/2 + 1/2) b. 1/2 * 1/2 * 1/2 + 1/2 * 1/2) c. 1/2 + 1/2*1/2 d. 1/2*1/2*1/2*1/2*1/2 It should be that, I might be wrong though
*November 7, 2013*

**Math**

6 51 not that hard think hte highest number of 0,1,2,3,4,5 - its 5, then the highest numebr in the row, its 1 So, 5 1 = 51 smallest number = smallest number of 0,1,2,3,4,5 - its 0, then the smallest nuber, its 6 0 6 = 6
*November 7, 2013*

**Calculus I**

How did you get 16t^2?
*November 6, 2013*

**Calculus I**

A zombie steps off a 35-foot wall by mistake, landing in the river below. How long will it take the zombie to fall?
*November 6, 2013*

**Science**

Check the site that Elena gave the lenntech one -it gives chemical properties. Pretty detailed, too.
*November 6, 2013*

**Science**

Go to Google --> Periodic table ---> properties. Not that hard -.-
*November 6, 2013*

**Math-Trigonometry**

Thanks a ton!
*November 6, 2013*

**Math-Trigonometry**

Show that if A, B, and C are the angles of an acute triangle, then tan A + tan B + tan C = tan A tan B tan C. I tried drawing perpendiculars and stuff but it doesn't seem to work? For me, the trig identities don't seem to plug in as well. Help is appreciated, thanks.
*November 6, 2013*

**algebra**

a*z^2 + b*z^2 + a*z^3 + b*z^3 reorder: a*z^3 + b*z^3 + a*z^2 + b*z^2
*November 6, 2013*

**math**

the pattern is 2, 4, 6, 8, ..... 2+4+6+8+10+12+14+16+18 = 90 Thus for the next, there will be 10 red and 10 green. So, there will be 10 more red than green: x+y = 100 x=y+10 y = 45 x = 55 So, x, or the number of red beads is 55
*November 6, 2013*

**internet**

If I don't misunderstand, it means "What does the news say about the subject/topic?"
*November 6, 2013*

**Math - Trigonometry**

Yay thanks man for the help
*November 6, 2013*

**Math - Trigonometry **

Let f(x) be a polynomial such that f(cos theta) = cos(4 theta) for all \theta. Find f(x). (This is essentially the same as finding cos(4 theta) in terms of cos theta; we structure the problem this way so that you can answer as a polynomial. Be sure to write your polynomial ...
*November 6, 2013*

**Chemistry**

List the following compounds in order of increasing electrical conductivity: 0.1 M formic acid (HCOOH), 0.1 M (NH4)3PO4, 0.1 KCl, and 0.1 M glucose solution (C6H12O6). Why are they in that order?
*November 6, 2013*

**Math**

THANK YOU SO MUCH!
*November 5, 2013*

**Math**

An equation of the tangent line to the curve y=f(x)=x(4cosx−6sinx) at the point (3f(3)) is y =? Note: Please follow these instructions carefully: (a) Express f(3) and f(3) in terms of . Simplify those expressions by evaluating the exact values of sin(3) and cos(3). (b) ...
*November 5, 2013*

**Math - Trigonometry**

Thanks a lot :)
*November 5, 2013*

**Math - Trigonometry**

If sin theta +cos theta =1.2, then what is sin^3 theta + cos^3 theta? Hmm...I don't understand how to proceed. I know I must apply a trig Identity, but which one? Thanks in advance
*November 5, 2013*

**Math**

in a relationship between variable called that changes in response to another variable? function input function independent variable dependent variable (my choice)
*November 1, 2013*

**Science**

lungs -_-
*October 31, 2013*

**Physics**

A flowerpot falls from a window sill 28.6 m above the sidewalk. What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s
*October 31, 2013*

**English **

which of the following statements about american romantic poetry is not true? A)it followed a fixed rhyme scheme B)its themes originated in British literature C)it was influenced by Gothic literature D)it was filled with emotion
*October 31, 2013*

**Trigonometry**

Thanks a lot man ^_^ Much appreciated :)
*October 31, 2013*

**Trigonometry **

A calculator is broken so that the only keys that still work are the sin, cos, tan, cot, sin^-1, cos^-1, and tan^-1 buttons. The display initially shows 0. In this problem, we will prove that given any positive rational number q, show that pressing some finite sequence of ...
*October 31, 2013*

**Science**

More or less a fruit. But because of the taste, people say it's a vegetable. (It's still a fruit though ;) )
*October 31, 2013*

**Substution Soluton MATH**

1. subtituting we get -5x + 2 = 3x-14 so we get 8x = 16 and x=2, then plugging back in we get y = 2*-5 + 2 = -8 2. subtracting first from second equation gives us 4x = 4 so x = 1, and y = -1 3. 4x + 2 = 8 so 4x = 6, and x = 3/2 also thus 3/2*6 + 2y = 4 2y= -5 y = -5/2 maybe ...
*October 31, 2013*

**help...**

Hi writeacher how do you post urls?
*October 30, 2013*

**Trigonometry - Checking my work**

Oh thanks that helped a lot :)
*October 30, 2013*

**Trigonometry - Checking my work**

Find the sum of the three smallest positive values of theta such that 4 cos^2(2theta-pi) =3. (Give your answer in radians.) Hi guys, I've been struggling with this problem. Here's my thinking about the problem: we can rewrite the equation as cos^2(2theta-pi) = 3/4 Then...
*October 30, 2013*

**Graphing - Trigonometry**

thanks a lot steve you're awesome and helping me a lot on these problems I've tried working on them and when I couldn't you helped me so thanks
*October 29, 2013*

**Graphing - Trigonometry**

thanks a lot man :)
*October 29, 2013*

**Graphing - Trigonometry**

Below is the graph of y = a cos(bx+c)+d, where a, b, and c are positive, and c is as small as possible. Find a + b + c + d. prntscr. com/20mkyo The link is to a screenshot of the graph. (without spaces) I'm unsure of how to solve - I tried it and got y = 2 cos (2/3x + 5pi/...
*October 29, 2013*

**Math**

3*(-3)^3 *(2)^2 + (-3)(6)^2 = -27*3 * 4 + -108 = -324 + -108 = -432 :D
*October 29, 2013*

**math**

Multiplicative Property of Equality The formal name for the property of equality that allows one to multiply the same quantity by both sides of an equation. This, along with the additive property of equality, is one of the most commonly used properties for solving equations. ...
*October 29, 2013*

**Math**

3 yards = 9 feet because 1 yard = 3 feet 9 feet / 18.75 in = 9*12 / 18.75 = 108/18.75 = 5.76 She can make 5 frames with some wood left over. This makes sense because 18 3/8 in is about 1 foot and 1/2 so thus 9 / 1.5 = 18/3 = 6 about. Since it is a bit over thus it is 5.
*October 29, 2013*

**Trigonometry**

Thanks man
*October 27, 2013*

**Trigonometry **

For 0<x<pi/2, sin x and cos x are both less than 1 and greater than 0 (easy to see). We are also given that sin^2x+cos^2x=1. Use this to show that sin^7x+cos^7x<1 for 0<x<pi/2. Unsure on how to proceed?
*October 27, 2013*

**Math/Probability**

The random variable X has a log-normal distribution, when the mean of ln(X) = 5.45 and variance of ln(X) = 0.334, what is the probability that X >139.76?
*October 27, 2013*

**chemistry**

Why do acids and bases conduct electricity?
*October 26, 2013*

**physics**

The coefficient of restitution for a particular ball is 0.45. If he ball hits a surface traveling at 100 m/s its rebound speed will be
*October 25, 2013*

**science**

same here. please!
*October 25, 2013*

**math**

Using These Numerals 1,9,9,6 in the same order how can you make the numbers 73 76 77
*October 23, 2013*

**math**

add 7 to both sides : 21E + 7 -7 = 0+7 21E = 7 divide both sides by 21 21E / 21 = 7/21 E = 1/3 :D
*October 23, 2013*

**English ---- check grammar---**

Um That is a long paragraph... Later, when I was old enough to understand, I was lectured on how to cook stew. But I never learned how to cook the dish correctly, as done by my grandmother. needs a "However," instead of "But" I don’t remember exactly ...
*October 23, 2013*

**Chemistry**

List a series of test that would determine the order of activity (least active to most active) for the following metals: Zn, Mn, and Ag.
*October 22, 2013*

**writing**

URGENT Please remove thread as previously requested asap. Thank you. Writing Sam, Monday, October 21, 2013 at 5:46pm
*October 22, 2013*

**English**

Urgent. Please remove thread asap. English Sam, Monday, October 21, 2013 at 5:50pm Thank you
*October 22, 2013*

**math 9**

Thank you Kimmy!!
*October 20, 2013*

**math 9**

Identify the solution(s) of the system of equations, if any. 3x-2y=6 5x=5-25y A) (28/13, 3/13) B) (-3/17, 32/17) C) (32/17, -3/17) D) (32/9, 7/3) I think the answer is D but i did my check and still comes out incorrect
*October 20, 2013*

**Chemistry **

When CuCl2 and NH4OH are combined what is the product formed?
*October 20, 2013*

**Chemistry **

When CuCl2 and NH4OH are combined what is the product formed?
*October 20, 2013*

**Chemistry **

When CuCl2 and NH4OH are combined what is the product formed?
*October 20, 2013*

**math 8**

Actually it is C not B
*October 20, 2013*

**math 8**

thank you!
*October 20, 2013*

**math 8**

Identify the solution(s) of the system of equations, if any. 5x + 2y = 2 4x - 2y = 8 A) (9/10, -5/4 ) B) (–6, 16) C) (10/9, -16/9 ) D) (10, –24)
*October 20, 2013*

**math 5**

Identify the solution(s) of the system of equations, if any. 3x+2y=4 5x-4y=3 A) (1, 0.5) B) (0.5,1) C) (5, 5.5) D) 5/11, -2/11)
*October 20, 2013*

**Math 6**

Identify the solution(s) of the system of equations, if any. -3x-4y=2 8y=-6x-4 A) infinitely many solutions B) (-16/9, 5/6) C) (-2/3, 0) D) no solution
*October 20, 2013*

**math 4**

Identify the solution(s) of the system of equations, if any. 6x + 2y = 0 y = 1 - 5x A) (–1.5, –0.5) B) (–1.5, 0.5) C) (–0.5, –1.5) D) (0.5, –1.5)
*October 20, 2013*

**Math 3**

Identify the solution(s) of the system of equations, if any. x + 2y = 6 3x - 6y = 0 A) (3, 2/3) B) (3,3/2 ) C) (2/3, 3) D) (3/2, 3)
*October 20, 2013*

**Math 1**

Consider the following system of equations. y = 4x - 4 y - 4x = 3 What can you conclude about the system of equations? A) The system of equations is inconsistent. B) The system of equations is dependent. C) The system of equations is independent. D) none of these
*October 20, 2013*

**math**

Identify the solution(s) of the system of equations, if any. -4x - 4y = 4 4y = -4x - 4 A) no solution B) (0, -1) C) (-1, 0) D) infinitely many solutions
*October 20, 2013*

**chemistry thermodynamics**

a sample of methane gas of mass 25g at 250k and 18.8atm expands isothermally until its pressure is 2.5atm. calculate the change in entropy.
*October 19, 2013*

**Chemistry**

how do I do this problem 0.700 mol of Na2S in 1.55 of solution?
*October 17, 2013*

**Trigonometry - Proof**

Thanks a lot!!!
*October 16, 2013*

**Math - Trigonometry**

Wait, is cos x the y coordinate or the x coordinate?
*October 15, 2013*

**Math - Trigonometry**

Thank you sir, I will take your advice. However, this problem is for an online class, and 2 does not seem to be the answer. Hmm...why?
*October 15, 2013*

**Math - Trigonometry **

For how many values of theta such that 0<theta<360 do we have cos theta = 0.1? (Note that theta is a measure in radians, not degrees!) I'm kinda confused with the problem? Could someone help me? I'm thinking unit circle, so cos is the x coordinate. It would be ...
*October 15, 2013*

**mathematics**

1. We need to find the greatest common divisor. IT might be 36. We check : 36/36 =1 , 72/36 = 2, 144/36 = 4 So the greatest number of students who can receive fruit is 36 (each student gets 1,2,4 fruits respectively) 2. Hmm...I'm sorta confused about this question...are ...
*October 15, 2013*

**ccbc**

A 12.3 vessel was found to contain N2, Ar He, and He. The total pressure in the vessel was 987 torr and the partial pressures of nitrogen, argon, and helium were 44 torr, 486 torr, and 218 torr, respectively. What was the pressure of neon in the vessel?
*October 14, 2013*

**math**

i'm still a bit confused
*October 13, 2013*

**biology help plz?????????????????**

Please tell me which one is TRUE or FALSE for the statements below: 1. During the cardiac cycle the pressure in the left ventricle and right ventricle are approximately equal. 2. During isovolumetric contraction the left ventricular pressure continues to increase and ...
*October 10, 2013*

**biology help?**

Please tell me which one is TRUE or FALSE for the statements below: 1. During the cardiac cycle the pressure in the left ventricle and right ventricle are approximately equal. 2. During isovolumetric contraction the left ventricular pressure continues to increase and ...
*October 10, 2013*

**Science**

When the number of gas particles in a container with constant volume decreases, does the pressure of the gas increases? If the number of gas particles at constant pressure increases, will the volume of the gas decrease? What is the relationship between gas particles and volume...
*October 9, 2013*

**math**

An internet company charges $30 a month. There is also a $30 installation fee. Is the number of months you can have internet proportional to the total cost?
*October 6, 2013*

**Math**

A paddle on an antique windmill needs to be visually inspected by a repairmen while the windmill is operating. The paddle can be seen by the repairman when it is at a height of 1.9m on its downward path. If the height of the paddle can be represented by the function, y=1.2764 ...
*October 4, 2013*

**math**

Rob has a balance of 1695$ in his bank account The account pays 2.9% interest per year, compounded annually. The compound interest formula is A=P(1+i)^n A=future value\P=principal/i+interest rate/n=number of payments rods balance will reach 3000$ after how many years?
*October 3, 2013*

**physics**

A football is thrown toward a receiver with an initial speed of 15.4 m/s at an angle of 38.7 ◦ above the horizontal. At that instant, the receiver is 17.7 m from the quarterback. The acceleration of gravity is 9.81 m/s 2 . With what constant speed should the receiver run...
*October 3, 2013*

**physics**

A football is thrown toward a receiver with an initial speed of 15.4 m/s at an angle of 38.7 ◦ above the horizontal. At that instant, the receiver is 17.7 m from the quarterback. The acceleration of gravity is 9.81 m/s 2 . With what constant speed should the receiver run...
*October 3, 2013*

**math**

The path of a cliff diver can be modeled by a parabolic curve. The regression equation matching one particular dive is h(t)= -4.9^2+4.6x+24.8 h is height t is time in seconds at what point in meters did the diver reach maximum height?
*October 2, 2013*

**math**

Please Help! The perimeter (distance around) of a triangle is 7/x+1, The sum of two sides of the triangle is 3/x, the distance of the remaining side follows he format ax+b/x^2+x. what is the vale of a?
*October 2, 2013*

**math**

The probability of rolling an even number of a die and drawing a red marble from a bag containing 3 red marble and 5 green marbles must be expressed as a reduced fraction of the form a/b what is the value of a and b?
*October 1, 2013*

**math**

Given the set (1,2,3,4,5) how many 3-digit numbers can be formed if the first digit is 5 and no digit is repeated?
*October 1, 2013*

**math**

In how many ways can 5 books be arranged on a shelf If 2 of the books are identical?
*October 1, 2013*

**math**

n!/n(n-1) is equivalent to? a) (n-2)! b) n-1 c) 1 d) 1/n-1
*October 1, 2013*

**math**

thank you. dont know how i missed 17.3
*September 30, 2013*

**math**

Never did prime numbers before today. 51times 1 is the only 2 numbers. confused
*September 30, 2013*

**math**

The LCM of two numbers is 51. Both numbers are greater than 1 and both numbers are prime. What are the two numbers?
*September 30, 2013*

**math**

Thanks, but i am still not sure of how you got it. Is there another way ?
*September 30, 2013*

**math **

The GCF of two numbers is 850. Neither number is divisible by the other. What are the least two numbers these could be.
*September 30, 2013*

**physics**

3. A box is given an initial speed of 3.0 m/s up an incline where the angle θ =22o. Use the diagram below to define the x-y axes. Assume the original position is on the ground (xo and yo = 0). Ignore friction. a. How far up the plane (in meters) will the box go? b. How ...
*September 30, 2013*

**math**

1,1/3,1/5,1/7, meaning the next number is 1/9 right?
*September 29, 2013*

**math**

1,0,1,1,01,1,1,0,1,1,1,101, meaning the next numbers are 1,01, right?
*September 29, 2013*

**Math**

How would you solve these compound inequalities? 1. -5k<-10 OR 3k>-9 2. 1/2z+3<-4 OR 2/3z-1>=1/5 3. -2<=n+2 divided by 3 <=4 4.p+4>6 AND 3p<=-18
*September 29, 2013*

Pages: <<Prev | 1 | 2 | 3 | 4 | **5** | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>