Monday

January 26, 2015

January 26, 2015

Total # Posts: 4,203

**Science**

When using the method to calculate the distance to stars, astronomers measure the parallax angels exactly 6 months apart. Why? Please help!
*November 25, 2013*

**Physics**

James joule measures temperature of the water at the top and bottom of the waterfalls. If one of these waterfalls is 55m high, and all gravitation energy of the water is at the top of the falls. What temperature difference would be between the water at the top and bottom? (...
*November 25, 2013*

**Physics**

James joule measures temperature of the water at the top and bottom of the waterfalls. If one of these waterfalls is 55m high, and all gravitation energy of the water is at the top of the falls. What temperature difference would be between the water at the top and bottom? (...
*November 25, 2013*

**Math-Algebra**

What have you done so far?
*November 24, 2013*

**Trig-Geometry - Law of sines and cosines**

Hello everyone, I've been struggling on this problem for quite some time. It would be appreciated if you could help. Thanks. (The website is the diagram, it is a screenshot) In the diagram below, triangle ABC has been reflected over its median AM to produce triangle AB'...
*November 24, 2013*

**math**

13/43 * 30/43* 30/43 Unless I am wrong. This may be more complicated than I think.
*November 24, 2013*

**biology**

D acetyl coa or coenzyme A
*November 24, 2013*

**biology**

At the end of the electron transport chain when electrons & H+ & O2 combine. Oxygen is the final electron acceptor.
*November 24, 2013*

**Admin?**

Hi do you know who the admins are or the moderators? thanks
*November 21, 2013*

**Law**

You probably want a new Vehicle identification number to prevent authorities from trakcing you down, so probably A, or maybe B. definitely not C or D ;)
*November 21, 2013*

**Math**

23/100 23% 0.03 3% 0.325 32.5% 1/4 25% 0.6 60% 0.75 3/4 12.5% 0.125 100% 1.00 1/1
*November 21, 2013*

**Math**

Sorta confused about the question, what do you mean?
*November 21, 2013*

**math**

1, 1, 5, 5 2, 2, 4, 4 3, 3, 3, 3
*November 21, 2013*

**maths**

What do you mean by the underscore?
*November 21, 2013*

**Trigonometry/Geometry - Law of sines and cosines**

In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, there are a few special ...
*November 21, 2013*

**math**

Nice, good job.
*November 21, 2013*

**maths**

underscore = ?
*November 21, 2013*

**Math**

0.721 x 100 means move decimal point to the right 2 spaces, so it should be 0.721 --> 7.21 ---> 72.1 72.1
*November 21, 2013*

**Trig-Medians and law of cosines and sines**

thanks a lot man!
*November 20, 2013*

**Trig-Medians and law of cosines and sines**

In triangle ABC, we have AB=3 and AC=4. Side BC and the median from A to BC have the same length. What is BC? Not making sense to me, I think the answer must be simple, but I don't know how to solve I applied the law of sines but to no avail. Help is appreciated, thanks.
*November 20, 2013*

**math**

use a calculator.... 25/41 is more than 1/2 13/30 is less thus 25/41 is greater
*November 19, 2013*

**Maths**

Uh......what...?
*November 19, 2013*

**literature**

the answer is definitely not c thats for sure I'd agree with you on the answer A since Franklin is sorta mocking the idea of witchcraft etc.
*November 19, 2013*

**Advanced Functions**

I guess so
*November 19, 2013*

**Advanced Functions**

Oh wow, we got teh same answer reiny cool
*November 19, 2013*

**Advanced Functions**

sin 60 cos 30 sin 120 (all degrees, not radians)
*November 19, 2013*

**algebra**

if you meant 499.79 - 15099000000 then the answer is -1509899500 please specify exatly what you mean it's not clear.
*November 19, 2013*

**Chemistry**

2.
*November 19, 2013*

**English**

what do you do in church, you meditate. so I'd say rink because what do you do in a rink, you skate.
*November 19, 2013*

**6th grade math**

yup you're right,
*November 19, 2013*

**Trig - Law of sines and cosines**

Thanks a lot
*November 19, 2013*

**Trig - Law of sines and cosines**

ABC is an equilateral triangle with side length 4. M is the midpoint of BC, and AM is a diagonal of square ALMN. Find the area of the region common to both ABC and ALMN. I drew the diagram but I don't know how to find the answer? I think it has something to do with the law...
*November 19, 2013*

**English**

C thermometer measures heat seismograph measures tremors (record and measure earthquakes)
*November 19, 2013*

**English**

which analogy
*November 19, 2013*

**English**

remember, a toe is part of the foot(there are 5 toes on a foot) which of the answers is part of another thing(there are 5 of the first on the second)
*November 19, 2013*

**Math**

(1.035)^years * 1500
*November 19, 2013*

**Science please**

google it Thermal, or heat energy Chemical Energy Electrical Energy w w w . nmsea . o r g /Curriculum/ Primer/ forms _ of _ energy . htm
*November 19, 2013*

**Trigonometry/Geometry**

In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, there are a few special ...
*November 19, 2013*

**Math (ALGEBRA)**

–2x(–3x 2y)(2y) = ? A. 12x3y2 B. –3xy2 C. 3xy2 D. –12x3y2
*November 15, 2013*

**Math**

y = 9 x = 12
*November 14, 2013*

**Math**

x+y = 21 x = y + 2 2y + 2 = 21 y = 19/2 x = 23/2
*November 14, 2013*

**Trigonometry - Identities**

Thanksa lot
*November 14, 2013*

**Trigonometry - Identities**

If tan 2x = - 24/7, where 90 degrees < x < 180 degrees, then find the value of sin x+ cos x. I applied various identities and tried manipulating the problem to get sin x + cos x = sin(arctan(-24/7)/2) + cos(arctan(-24/7)/2) I also played around with the half-angle ...
*November 14, 2013*

**math**

D yup xD
*November 14, 2013*

**Math**

500% roughly
*November 14, 2013*

**chemistry**

that was from y ahoo answers by the way
*November 13, 2013*

**chemistry**

Um...kinda hard to draw but from google you get: hydrogen gas and a nickel catalyst is the conditions for hydrogenation and/or carbonyl reduction. Since you have an alcohol, we can assume that there was a carbonyl reduction. To draw the starting material, start by drawing the ...
*November 13, 2013*

**Trigonometry - Identities and proof**

Show that cot((x+y)/2) = - (sin x - sin y)/(cos x - cos y) for all values of x and y for which both sides are defined. I tried manipulating both sides in terms of trig identities but I don't really have a solution....help would be appreciated, thanks.
*November 13, 2013*

**math**

0.5 + 2 = 2.5 2.5 / (1/4) = 2.5 / 0.5 = 5
*November 13, 2013*

**ELA? Check answers!!**

Was there some text? That might have been helpful when posted. Anyways, Your first answer was right, and the 2nd answer depedns on the text. The third answer, I would say it is interrogative because you need to ask a question to monitor a person's comprehension So the ...
*November 13, 2013*

**math**

7 * 3 * 2 = 42
*November 13, 2013*

**Algebra, URGENT!!!**

1) Mio can build a large shed in 15 days less than Yuuko can. If they build it together, it would take them 18 days. How long would it take each of them working alone? 2) If Kamina can do a job in 29 hours and Simon and Kamina working together can do the same job in 10 hours, ...
*November 13, 2013*

**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*

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