Thursday
April 17, 2014

Posts by Sam


Total # Posts: 3,849

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(...

BUSINESS MATH
9.8 * 40 + 9.8*1.5*4

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

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

Calculus I
How did you get 16t^2?

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?

Science
Check the site that Elena gave the lenntech one -it gives chemical properties. Pretty detailed, too.

Science
Go to Google --> Periodic table ---> properties. Not that hard -.-

Math-Trigonometry
Thanks a ton!

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.

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

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

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

Math - Trigonometry
Yay thanks man for the help

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 wit...

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?

Math
THANK YOU SO MUCH!

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) Y...

Math - Trigonometry
Thanks a lot :)

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

Math
in a relationship between variable called that changes in response to another variable? function input function independent variable dependent variable (my choice)

Science
lungs -_-

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

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

Trigonometry
Thanks a lot man ^_^ Much appreciated :)

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 butt...

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

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 yo...

help...
Hi writeacher how do you post urls?

Trigonometry - Checking my work
Oh thanks that helped a lot :)

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...

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

Graphing - Trigonometry
thanks a lot man :)

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/...

Math
3*(-3)^3 *(2)^2 + (-3)(6)^2 = -27*3 * 4 + -108 = -324 + -108 = -432 :D

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. P...

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.

Trigonometry
Thanks man

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?

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?

chemistry
Why do acids and bases conduct electricity?

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

science
same here. please!

math
Using These Numerals 1,9,9,6 in the same order how can you make the numbers 73 76 77

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

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 w...

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.

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

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

math 9
Thank you Kimmy!!

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

Chemistry
When CuCl2 and NH4OH are combined what is the product formed?

Chemistry
When CuCl2 and NH4OH are combined what is the product formed?

Chemistry
When CuCl2 and NH4OH are combined what is the product formed?

math 8
Actually it is C not B

math 8
thank you!

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)

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)

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

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)

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)

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

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

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.

Chemistry
how do I do this problem 0.700 mol of Na2S in 1.55 of solution?

Trigonometry - Proof
Thanks a lot!!!

Math - Trigonometry
Wait, is cos x the y coordinate or the x coordinate?

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?

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 ea...

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 th...

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?

math
i'm still a bit confused

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 eventuall...

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 eventuall...

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...

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?

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 ...

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?

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...

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...

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?

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?

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?

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?

math
In how many ways can 5 books be arranged on a shelf If 2 of the books are identical?

math
n!/n(n-1) is equivalent to? a) (n-2)! b) n-1 c) 1 d) 1/n-1

math
thank you. dont know how i missed 17.3

math
Never did prime numbers before today. 51times 1 is the only 2 numbers. confused

math
The LCM of two numbers is 51. Both numbers are greater than 1 and both numbers are prime. What are the two numbers?

math
Thanks, but i am still not sure of how you got it. Is there another way ?

math
The GCF of two numbers is 850. Neither number is divisible by the other. What are the least two numbers these could be.

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 mu...

math
1,1/3,1/5,1/7, meaning the next number is 1/9 right?

math
1,0,1,1,01,1,1,0,1,1,1,101, meaning the next numbers are 1,01, right?

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

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...

Algebra
Factor completely Y^3+y^2-4y-4

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?

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 i...

math
Thank you for all your help.

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