Sunday

February 26, 2017
Total # Posts: 2,660

**Trig identies, Calculus**

Use the identities cos^2 x + sin^2 x =1 and cos2x=cos^2 x -sin^2 x to show that cos^4 x -sin^4 x = cos2x Im not sure how, I can solve my problem with half angle identities but im not sure where to start with this.

*February 25, 2017*

**matrix, linear transformations**

To add this is the matrix multiplication im doing to get the answer: {{4,0},{0,6}}*{{0,1},{1,0}}*{{1,2},{0,1}

*February 25, 2017*

**matrix, linear transformations**

Morning, Bit confused: I have been given the following: g(x,y)=(4x,6y) h(x,y)=(x+2y,y) k(x,y)=(y,x) and ive got the following matrix for each of them: g={{4,0},{0,6}} h={{1,2},{0,1}} k={{0,1},{1,0}} So ive been asked to prove the linear transformation f=k.h.g has the matrix: A...

*February 25, 2017*

**Math Derivatives**

Find f''(2) of function f(x)=xsin(pi/x)

*February 22, 2017*

**math help asap**

For the data in the table does y vary directly with x? if it does write an equation for the dorect variation. x;y 10,15 16,24 20,30 a:yes; y=1.5x b:yes;y=2x c:yes;y=x+5 d: y does not vary directly with x if you are from connections and know any other answers/know to help with ...

*February 22, 2017*

**Differential equations,Calculus**

Thanks Steve.

*February 22, 2017*

**Differential equations,Calculus**

Just to add, by doing what I described above my answer for c would be the same value as for k (i.e 3.9 or 5/4pi) so my particular solution would be. t=k(-1/r)+5/4pi

*February 22, 2017*

**Differential equations,Calculus**

So I have the following differential equation. The general solution I have is: t=k(-1/r)+c I now need to find the particular solution when t=0 and the radius (r) = 1cm. So k is a constant which is approx 3.9 (5/4pi) So for the particular solution im really just plugging in the...

*February 22, 2017*

**Algebra**

1. The perimeter of a rectangle is 78 cm. The length is 3 greater than twice its width. Find the dimensions.

*February 21, 2017*

**chemistry**

Confused on how to find the reactants in these two compounds Ba(OH)2 (aq) + I2Zn (aq) -> ?? Additionally, I am not really sure how to find the ionic equation for this.

*February 21, 2017*

**Differential equation, calculus**

Thanks, just testing out methods and got carried away!

*February 21, 2017*

**Differential equation, calculus **

Hiya, Dt/dr =k/r^2 Is this directly solvable or do I need to separate variables. I've got t=-k/r+c from the former and something along the lines of r^3=kt+c from the latter. Think I'm doing it all wrong. Thanks

*February 21, 2017*

**Biology**

What is the path that electrons take in C3 photosynthesis?

*February 20, 2017*

**chemistry**

Balance the following chemical reaction and determine the number of moles of HI produced when 2.33 moles of H2(g) are consumed in the following chemical reaction: ___H2(g) + __I2(g) -> ___HI (g)

*February 19, 2017*

**Chemistry**

Hello, I was hoping that I could get some help with calculating the mass needed to completely react with this question. In the following chemical reaction between H2 and N2 to produce NH3, what is the mass of N2 needed to completely react with 0.65 g H2 to produce 3.68 g of ...

*February 19, 2017*

**Differential equation **

A spherical balloon remains spherical as it is slowly inflated. The radius of the balloon r (in cm) at time t (in seconds) satisfies the differential equation. Dr/dt = k/r^2 where k is a positive constant. When the radius is 3 cm, the radius is increasing at the rate of 5/36pi...

*February 19, 2017*

**Social Studies---Please Help!**

The answer is D

*February 8, 2017*

**Accounting**

Cupid Co. has total assets of $600,000 and its liabilities are equal to two-thirds of its total assets. What is the amount of Cupid Co.'s Owner's Equity? Please explain how you got this answer.

*February 7, 2017*

**Math - limits**

Let f(t)=sint where t is the measure of the angle in degrees. Thus f is the sin function on your calculator if you select degree mode. Then: lim(t->0)(f(t)/t)= (Your answer will be a real number.)

*February 7, 2017*

**History**

How did the issue of states' rights influence South Carolina's decision to secede? this is a short answer, so there are no options. please help. thanks in advance :)

*February 7, 2017*

**History**

How did the results of the presidential election in 1860 influence South Carolina's decision to secede? there are no choices, it is a short answer. please help :)

*February 7, 2017*

**Math**

Which ordered pair would be plotted by starting from the origin and moving 0.25 units left and then 3 units up? A) (3, -0.25) B) (0.25, -3) C) (-0.25,-3) D) (-0.25, 3)

*February 7, 2017*

**Math help PLEASE!!!!**

C

*February 3, 2017*

**Math**

How do I shift f(x)=x^2+sinx 3 to the right and 7 up?

*January 31, 2017*

**Algebra**

Name a pair of complementary angles A- anglesign 1 and anglesign 4 B- anglesign 1 and anglesign 6 C- anglesign 3 and anglesign 4 D- anglesign 4 and anglesign 5 I think it's D

*January 30, 2017*

**american goverment check answers**

yup the answer is D. 2 is B and C and 3 is D btw :)

*January 27, 2017*

**Math**

Ah okay. Thanks!

*January 26, 2017*

**Math**

5!=120 1/120= 0.0083 but the options are 0.1 0.054 0.0167 Impossible to determine Am I missing something?

*January 26, 2017*

**Math**

5 students are randomly seated along the side of a table. What is the probability that they are seated in order of age?

*January 26, 2017*

**Math**

Ms. Sue read the question wrong. Set a variable for floor value. x*1.95=184.49 x=184.49/1.95

*January 26, 2017*

**Physics**

You drop a rock into a deep well. You can't see the bottom of the well but you can hear the impact after T seconds. Suppose the speed of sound is c feet per second and the depth of the falling rock at time t is gt^2/2 feet. Compute the depth d of the well. Your answer will...

*January 26, 2017*

**SS**

The correct answer was D from monarchy to democracy. I took the same quiz, the answers are: 1. A 2. C 3. A 4. D 5. D

*January 24, 2017*

**american goverment check answers**

1. A 2. C 3. C and D 4. C just took the quick check 100% :)

*January 23, 2017*

**math adv funcrions**

2sin5xcos4x-sinx=sin9x Can u do this without triple angle formula and how

*January 23, 2017*

**Social Studies**

You work for President Lula's government. You are most likely to support A) tax cuts for corporations.**** B) privatization of industry C) redirection of oil wealth to provide social services. D) budget cuts to education and health care

*January 22, 2017*

**Social Studies**

My textbook? My textbook is online and it didn't say anything about Roman Catholicism.

*January 22, 2017*

**Social Studies**

Brazil's culture reflects what unique aspect of its colonial history? A) its Roman Catholic missionary roots B) its ties to the West African slave trade C) its rule and settlement by the Portuguese D) its peaceful blending of native and European peoples

*January 22, 2017*

**Social Studies**

Okay thank you!

*January 21, 2017*

**Social Studies**

Wealth disparity in Brazil results mostly from? A)unequal land distribution.**** B)insufficient arable land. C)lack of oil and mineral resources. D)emphasis on cash crop exports.

*January 21, 2017*

**Physics**

A very long uniform line of charge has charge per unit length 3.70 µC/m and lies along the x-axis. A second long uniform line of charge has charge -2.20 µC/m per unit length and is parallel to the x-axis at y = 0.400 m. What is the net electric field (magnitude and...

*January 19, 2017*

**English**

i also just took it and "whatever"'s answers are correct.

*January 18, 2017*

**English**

can confirm these are 100%

*January 18, 2017*

**English**

Those answers above are right

*January 18, 2017*

**Geometry**

The base of a right triangular prism is a right isosceles triangle whose equal sides measure 25 cm each. The volume of the prism is 0.075 cubic meters. Find the height of the prism

*January 10, 2017*

**Social studies**

Nope Unknown is 100% correct Mrs.Sue looks like the prankster XD

*January 10, 2017*

**language arts**

@Cam'Ron KILL YOURSELF

*January 6, 2017*

**am I right ? or no?**

Which equations represent exponential growth? Which equations represent exponential decay? Drag the choices into the boxes to complete the table. Exponential Growth: y=4000(1.0825)^t ,y=12,000(0.72)^t , y=8000(0.97)^t , Exponential Decay: y=1700(1.25)^t , y=240(1/2)^t , y=1.5(...

*January 4, 2017*

**Algebra 1- Urgent**

The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time. The price f(x), in dollars, of product A after x years is represented by the function below: f(x) = 0.69(1.03)x ...

*December 17, 2016*

**Algebra 1- Help please**

Belinda wants to invest $1000. The table below shows the value of her investment under two different options for three different years: Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part A: What type of function, ...

*December 17, 2016*

**Algebra 1 Please help**

f(n) = 8(1.05)^n, sorry

*December 17, 2016*

**Algebra 1 Please help**

A scientist is studying the growth of a particular species of plant. He writes the following equation to show the height of the plant f(n), in cm, after n days: f(n) = 8(1.05)n Part A: When the scientist concluded his study, the height of the plant was approximately 11.26 cm. ...

*December 17, 2016*

**calculus!**

use the definition of derivative to find d/dx(1/(3-x))

*December 16, 2016*

**Science**

Completely right, thanks man!

*December 16, 2016*

**Math**

Statistical questions will have. A)Only one correct answer**** B)A variety of answers C)Fewer than three answers D)No answers

*December 15, 2016*

**Algebra**

Thank you.

*December 15, 2016*

**Algebra**

oh I just realized I put it on B not C sorry

*December 15, 2016*

**Algebra**

For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation. 8|13 16|26 24|39 A:yes;y=5x B:yes;y=10x*** C:yes;y=1.625x D:no;y does not vary directly with x

*December 15, 2016*

**American Government**

1. D, 2. B, 3. B 100%

*December 14, 2016*

**Math**

Thank you so much, Merry Christmas if you celebrate.

*December 14, 2016*

**Math**

Find the lower, upper and interquartile range 20,22,25,28,29,30,32,33,34 Math is not my best subject.

*December 14, 2016*

**Health**

Okay, thank you so much.

*December 14, 2016*

**Health**

I don't have a textbook.

*December 14, 2016*

**Health**

In some cultures, people choose not to eat any type of animal products. How might these people get the protein they need? A)fruits that have a pit-mangos, avocados, apricots, and peaches B)lots of green leafy vegetables**** C)nuts, dried beans, dries peas and lentils D)root ...

*December 14, 2016*

**Calculus AB**

The position function of a particle in rectilinear motion is given by s(t) = 2t^3 - 21t^2 + 60t + 3 for t ? 0. Find the position and acceleration of the particle at the instant when the particle reverses direction. Include units in your answer. So I've already gotten the ...

*December 13, 2016*

**American Government**

1. D 2. B 3. B

*December 12, 2016*

**TX HIST**

I have answers, I'm not sure if they are valid so I was trying to get a 2nd opinion. Thanks.

*December 11, 2016*

**TX HIST**

During the 20th century, what has happened to make TX more like the rest of the nation? On the other side of that question, what is truly distinctive about TX that will have a continuing influence on TX’s future?

*December 11, 2016*

**TX HIST**

For the borders, they were set from the Treaty of Guadalupe Hidalgo and the Compromise of 1850 right? I know its border followed the Rio Grande but I don't know much more

*December 11, 2016*

**TX HIST**

How did Lyndon Johnson alter southern politics? What was it about his being a Texan that influenced him in these actions? How were Texas’ borders created? What is the history of its distinctive shape?

*December 11, 2016*

**TX HIST**

Okay thank you!

*December 11, 2016*

**TX HIST**

For the first one, they were all racial cases correct? And they all favored that race?

*December 11, 2016*

**TX HIST**

I just need the answer to that question in a few sentences

*December 11, 2016*

**TX HIST**

Consider these three Supreme Court cases Smith v. Allwright (1944), Sweatt v. Painter (1950), Brown v. Board of Education (1954). What do they have in common, and how did Texans respond? In the 20th century, what were the most important events for Mexican-Americans and the ...

*December 11, 2016*

**math**

equation of a straight line perpendicular to x-axis passing through the point (3,-1)

*December 10, 2016*

**Math**

thanks

*December 10, 2016*

**Algebra 1**

Thank you! @Steve

*December 9, 2016*

**Algebra 1**

1.) Which best describes a system of equations that has no solution? •consistent, independent •inconsistent, dependent •consistent, dependent •inconsistent* ANSWER: D Please check my answer, thank you!

*December 9, 2016*

**Math - Calculus**

Find the area of the surface of revolution generated by revolving the curve y = 3 sqrt (x), 0 <= x <= 4, about the x-axis. Okay, so I've set up the integral like this: 2pi ?[0,4] (3 sqrt (x))(sqrt(1+(1/4x)))dx Which is coming out to 108.5, but that's not giving ...

*December 8, 2016*

**Equations and Inqualities Help!!**

I need the right answers to the lesson 14 7 A unit test equations and inqualities

*December 8, 2016*

**backwards substitution**

15x \equiv 20 (mod 88) 13=88-5*15 2=15-1*13 1=13-2*6 GCF is 1. Im trying to use backwards substitution and so far have 1=13-2*(15-1*13) but I dont understand what to do next, can anyone help?

*December 7, 2016*

**Social Studies Pretest Lesson 1 Unit 7**

B B C D C B B B A

*December 7, 2016*

**math**

if 7 times the 7th term of an A.P is equal to 11 times its eleventh term , what will be its 18th term?

*December 7, 2016*

**CAL 3**

Use the Divergence Theorem to calculate the surface integral S F · dS; that is, calculate the flux of F across S. F(x, y, z) = 3xy2i + xezj + z3k, S is the surface of the solid bounded by the cylinder y2 + z2 = 1 and the planes

*December 6, 2016*

**Affine ciphers, modular inverse**

So using the inverse of 17 modulo 26 I have -3(y-4)(mod 26) first am I correct? (I originally started with -3(y+22)(mod 26)) And im now trying to decipher a simple message. Which I will plug the numbers of the letters into the equation instead of y. Again am I doing this ...

*December 6, 2016*

**CALC**

Use the Divergence Theorem to calculate the surface integral S F · dS; that is, calculate the flux of F across S. F(x, y, z) = x^4i ? x^3z^2j + 4xy^2zk, S is the surface of the solid bounded by the cylinder x^2 + y^2 = 4 and the planes z = x + 6 and z = 0.

*December 6, 2016*

**CALC**

Use the Divergence Theorem to calculate the surface integral S F · dS; that is, calculate the flux of F across S. F(x, y, z) = x&2yi + xy^2j + 2xyzk, S is the surface of the tetrahedron bounded by the planes x = 0, y = 0, z = 0, and x + 3y + z = 3.

*December 6, 2016*

**American Government**

thx! 100% :)

*December 6, 2016*

**history**

Damn your super impatient lmao. '_'

*December 5, 2016*

**Urgent!**

A hospital nursery has 3 boys and some girls. A child was selected at random what is the probability that the child is a boy?

*December 3, 2016*

**Math - Calculus**

Nevermind, I got it: ?[0,1]2pi(x+1)(8-2x-6x^2)dx = 41pi/3

*December 2, 2016*

**Math - Calculus**

The region in the first quadrant bounded by y=6x^2 , 2x+y=8, and the y-axis is rotated about the line x=-1. The volume of the resulting solid is: Please help me set up the integral for this one, I'm not sure how to do it. I've tried ?[-4/3,1] pi (8-2x-1)^2-(6x^2-1)^2 ...

*December 2, 2016*

**Calculus**

Find the area of the region in the first quadrant between the curves y=x^8, and y=2x^2-x^4

*December 2, 2016*

**English Help ASAP**

@ reed , if you're not going to 'help' then don't come on here lol

*December 1, 2016*

**Social Studies**

"...I long to hear that you have declared an independency- and by the way in the new Code of Laws which I suppose it will be necessary for you to make I desire you would Remember of the Ladies, and be more generous and favorable to them than your ancestors...If particular...

*December 1, 2016*

**Social Studies**

minnie you are not right you got 1 right that is all the actual answers are as follows 1. D 2. A 3. A 4. D

*December 1, 2016*

**Algebra**

What is the algebraic expression for the following word phrase: the product of 4 and x. A: 4+x B: 4x C: 4-x D: 4/x I think it's A. Am I right?

*December 1, 2016*

**Calculus**

For which pair of functions f(x) and g(x) below will the lim(x->infinity) f(x)g(x)?0 a)f(x) = 10x + e^-x; g(x) = (1/5x) b)f(x) = x^2; g(x) = e^-4x c)f(x) = (Lnx)^3; g(x) = 1/x d)f(x) = ?x; g(x) = e^-x

*November 30, 2016*

**Science physics**

A ship is heading north at 15km/h in a tide moving at 6km/h westward. Determine the magnitude and direction of the resultant velocity of the ship.

*November 30, 2016*

**Algebra 2**

ht tp: //w ww. 17 28. org/ cub ic2. h tm *remove the spaces in between. I hope this will help you. It explains the actual process of factoring cubic equations.

*November 28, 2016*

**American History**

The federal government sets requirements that all public schools must follow, while state governments set standards listing what students need to learn. This is an example of what constitutional system? A. dual federalism B. cooperative federalism C. layered federalism D. ...

*November 27, 2016*