Friday

March 27, 2015

March 27, 2015

Total # Posts: 4,319

**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*

**6th Grade Math**

4 exponent 3 x 5 exponent 2
*October 24, 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*

**World History**

When might Sieyes claim that women would be eligible for the equal rights that Etta Palm d'Aelders states that they rightfully deserve?
*October 21, 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*

**Math**

Tom took 4 secs to run 6 yards, Diane ran 5 yards in 3 secs. Who would get to 30 yards first?
*October 18, 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*

**statistics**

.28
*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*

**Main Ideas**

Both Seagulls and wild geese are large birds. They're also similar in that both kinds of birds can fly over great distances. On the other hand, seagulls are scavengers, while wild geese aren't. Seagulls, for example, are often found around garbage dumps. Geese, however...
*September 27, 2013*

**Algebra**

Factor completely Y^3+y^2-4y-4
*September 26, 2013*

**Math**

How do you write an equation to solve for x when you have a rectangle that is 7 for height and 3x - 2 on length and how do you solve for x?
*September 26, 2013*

**physics**

A soccer ball is kicked from the ground with an initial speed of 20.0 m/s at an upward angle of 43.7˚. A player 50.3 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before ...
*September 25, 2013*

**math**

Thank you for all your help.
*September 25, 2013*

**math**

Need help . A board is 24 inches long. Find all the whole- number lengths into which it can be evenly divided
*September 25, 2013*

**English**

What literary device would pertain to these sentences? 1. He leaned hard against the wall. (Upright structure which encloses something or serves as a boundary) 2. "It was not the buildings or arch that made the children gasp. It was how the buildings were shaped-- ...
*September 23, 2013*

**Math**

The x is a variable put into the equation so it would be -6x + (plus) (1 - 3x) * 8
*September 23, 2013*

**Math**

umm.. it is -6x + (1 - 3x) * 8
*September 23, 2013*

**Math**

Multiplication signs. Sorry :(
*September 23, 2013*

**Math**

Can I get help on just 3 questions? -6x + (1 - 3x) x 8 (r-1) x -3 - 3 (n-4) x -7 +7 Thanks
*September 23, 2013*

**Math**

Please help! 1) -6 + 5(-5 - 3m) 2) -3 + 4(x + 2) 3) 3(1 + 5n) - 6n 4) -6b - 6(3 -4b) 5) -6x + (1-3x) x 8 6) (r - 1) x -3 - 3 7) (n - 4) x -7 + 7 8) -4(6 + 4v) + 7 Thanks.
*September 23, 2013*

**math**

thank you
*September 23, 2013*

**math **

P lease need help with the following 4,830.5 divided by 5 round to the nearest hundredth. and 68.1 divided by 13 also rounded to nearest hundredth
*September 23, 2013*

**physics **

An electron at ground state in the atom (-10.38eV)is struck by a passing electron with 7.00eV of energy. What is the velocity of the passing electron afrer the collision?
*September 23, 2013*

**physics **

An electron at ground state in the atom (-10.38eV)is struck by a passing electron with 7.00eV of energy. What is the velocity of the passing electron afrer the collision?
*September 23, 2013*

**physics**

Neon-20 has a nuclear mass of 19.992439 amu. the total nuclear binding energy for Ne-20 is? (Mprotons=1.6726x10^-27 kg) (Mneutron=1.6749x10^-27kg)
*September 23, 2013*

**AP Physics**

A pail of water is rotated in a vertical circle of radius r = 1.49 m. The acceleration of gravity is 9.8 m/s 2. What is the minimum speed of the pail at the top of the circle if no water is to spill out? Answer in units of m/s
*September 23, 2013*

**Physiology**

How does semiconservative relates to DNA replication?
*September 22, 2013*

**math**

thank you very much
*September 22, 2013*

**math**

Please help. round to the nearest penny [ hundredth] $10.13 x4.5
*September 22, 2013*

**chemistry**

A particle with the mass of a proton is trapped in a box. The particle falls from the n=3 state to the n=2 state and emits 0.16 meV of energy. What is the size of the box? Please report your answer in nm.
*September 21, 2013*

**physics**

An observer uses a 10 sided mirror to measure the speed of light. A clear image occurs every one-tenth of a rotation when the mirror is rotating at 4.31x10^2 rev/s. The total path of the light pulse is 60 km, measured from the light source to the mirrors and reflected back to ...
*September 20, 2013*

**Math, Trigonometry**

The height of a person on a ferris wheel is measured by function h(t)=38 sin 3.5 (t-4.0)+41.? h= height of person in feet t=represents the time in minutes. a) At what height, to the nearest tenth, are passengers loaded onto the Ferris wheel ? what characteristics of the graph ...
*September 19, 2013*

**Physics**

What net external force is required to give a 30 kg suitcase an acceleration of 2.5 m/s2 to the right? Answer in units of N
*September 18, 2013*

**Math**

Estimate the total weight of two boxes that weigh 9.4 lb and 62.6 lb using rounding and compatible numbers. Which estimate is closer to the actual weight?Why?
*September 17, 2013*

**College Algebre**

f(x)= -3x^2+5x-2 Find f(x+h)/h
*September 16, 2013*

**Maths**

Nth terms I have to find the first 5 terms in the nth sequence. please could someone show me how to work this out, using the example below so I can do the next set of questions. 10-2n
*September 16, 2013*

**Physics**

When nitrogen(atomic mass=14,atomic number=7) is bombarded with neutrons, the collision resulted in disintegrations in which alpha particles are produced. Represent this transmutation in symbolic equation .
*September 15, 2013*

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