Friday

October 21, 2016
Total # Posts: 809

**Chemistry**

Magnesium oxide can be made by heating magnesium metal in the presence of oxygen. The balanced equation for the reaction is: 2Mg(s)+O2(g)→2MgO(s) When 10.1 g of Mg are allowed to react with 10.5 g of O2, 14.5 g of MgO are collected. a) Determine the limiting reactant for...

*October 19, 2016*

**Physics **

You have a mass of 84 kg. How fast (in mph) would you have to run to have the same momentum as an 18-wheeler (m = 28,000 kg) rolling along at 1 mph

*October 18, 2016*

**physics**

You have a mass of 84 kg. How fast (in mph) would you have to run to have the same momentum as an 18-wheeler (m = 28,000 kg) rolling along at 1 mph

*October 18, 2016*

**Chemistry**

Calculations involving a limiting reactant Now consider a situation in which 20.0 g of P4 is added to 54.0 g of Cl2, and a chemical reaction occurs. To identify the limiting reactant, you will need to perform two separate calculations: 1) Calculate the number of moles of PCl5...

*October 17, 2016*

**Chemistry**

What is the maximum mass, in grams, of NH3 that can be produced by the reaction of 1.0 g of N2 and 1.0 g of H2 using the reaction below? N2+H2→NH3 (not balanced) What is the maximum mass, in grams, of that can be produced by the reaction of 1.0 g of and 1.0 g of using ...

*October 16, 2016*

**Physics **

A rock is thrown off a cliff with a vertical speed of 53 m/s upward and a horizontal speed of 30 m/s. A) what will these speeds Vx and Vy, be 4 seconds later? B) what will be the x and y displacements of the rock be 4 seconds later?

*October 14, 2016*

**Physics **

Al the astronaut has a weight of 1600 N when he is standing on the surface of earth. What is the force of gravity action on him when he is in space station orbiting earth at a distance of four earth radii from the center of the earth?

*October 14, 2016*

**Physics **

Angela and Paul are opposite ends of the 4.0 m long bar. Paul, whose mass is 78 kg feels attraction to Angela, whose mass is 55 kg. A: If the attraction is gravitational, how strong, in Newtons, is it? B: What are their individual weights?

*October 14, 2016*

**Math**

|x - 8|- 15 = -6 How do I solve this.. Please don't do it for me..

*October 10, 2016*

**Math**

thanks!

*October 10, 2016*

**Math**

3x + 9 = 7x - 11 How do I solve this? You said subtract three x from each side, then all eleven to both side then divide each side by 10? I'm confused...

*October 10, 2016*

**Math**

The equation of a line is -6x-2y= -18 What is the x-intercept of the line? -3 3 <-- ? 9 -9 The equation of a line is x+5=12 What is the y-intercept of a line? -12 5/12 12 <-- idk not sure 12/5 The equation of a line is 2x-2y=6 What is the slope of the line? 1 1/3 -1 -3 &...

*October 10, 2016*

**Match *checking answers***

Math sorry..

*October 10, 2016*

**Match *checking answers***

The equation of a line is -6x-2y= -18 What is the x-intercept of the line? -3 3 <-- ? 9 -9 The equation of a line is x+5=12 What is the y-intercept of a line? -12 5/12 12 <-- idk not sure 12/5 The equation of a line is 2x-2y=6 What is the slope of the line? 1 1/3 -1 -3 &...

*October 10, 2016*

**physics**

Please help! The planet Mercury has a radius of about 0.38 Earth radii and a mass of only 0.055 Earth masses. Estimate g on Mercury

*October 8, 2016*

**Chemistry**

Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) 2. 2Na(s) + Cl2(aq) → 2NaCl(s) 3. 2Mg(s) + O2(g) → 2MgO Identify the oxidation-reduction reactions among the following: 1 and 2 only 2 and 3 only 1 and 3 ...

*October 3, 2016*

**Physics **

When an item has been launched into orbit, what happens? 1: It continues to fall but its path never reaches the ground. 2: Centripetal force from Earth's gravity keeps it from being accelerated toward Earth. 3: It no longer falls because the weakness of Earth's gravity...

*October 1, 2016*

**Science **

How many grams of sodium bicarbonate (NaHCO3) are needed to make a 0.6M solution?

*September 14, 2016*

**Math**

The union of sets P = {1, 2, 3, 4, 5, 6} Q = {4, 5, 6, 7, 8, 9} is given by which of the following? {1, 2, 3, 4, 5, 6, 7, 8, 9} {1, 2, 3, 4, 4, 5, 5, 6, 6, 7, 8, 9} ø {4, 5, 6}

*August 29, 2016*

**Research Methods**

Thinking of a survey you might design for a commercial client such as a software company or a restaurant, what are the ethical implications of using the survey results to publicize your own research firm? Looking forward to some ideas! Thanks!

*July 11, 2016*

**Math**

A flag has a length of 1 1/4 feet when the width is 1 2/7 feet. Write the ratio to the width as a fraction in simplest form.

*June 23, 2016*

**Math**

Consider an airplane headed N 60 degrees W at a speed of 400 mph. What wind direction at a speed of 75 mph will produce a resultant direction of N 50 degrees W?

*June 8, 2016*

**Pre Calc**

visually show on compass/vector graph n 60 degrees w at 400 mph, n 40 e at 75 mph

*June 7, 2016*

**Pre Calc**

Airplane going N 60 degrees W at a speed of 400 mph. What wind direction, at a speed of 75 mph will produce a resultant direction of N 50 degrees W

*June 7, 2016*

**advanced science**

A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the acceleration of the crate? (Hint: remember to find net force first) a=6.00 m/s2 a=28.1 m/s2 a=8.10 m/s2 a=6.0 m/s2

*June 3, 2016*

**advanced science**

A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the normal force? A. 480 N down B. 480 N up C. 2300 N down D. 2300 N up

*June 3, 2016*

**advanced science**

A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. The forces acting on the crate are __________________. A. balanced B. unbalanced

*June 3, 2016*

**Math**

Help please. .6 is 266 2/3% of what number?

*May 13, 2016*

**English**

The answer is A. She was in awe of the size of the dust cloud.

*May 8, 2016*

**Bus. Math**

Umm...most of these look wrong. Anyone have the solutions?

*April 4, 2016*

**MATH HELP**

Zoro Manufacturing Company manufacturers wooden picture frames. Each piece of wood yields 15 frames. Each piece of wood costs $18.75. The direct labor charge is $13.50 per hour. Sixty-five frames can be produced each hour. To the nearest tenth of a cent, what is the prime cost...

*March 2, 2016*

**MATH HELP**

I just don't get it

*March 2, 2016*

**Math**

I need help please. the mean distance of earth from the sun is 92,960,000 which is 258% of the mean distance of mercury from the sun. What is mercury’s mean distance from the sun in ten millions of miles?

*February 28, 2016*

**Math**

I need help please. the mean distance of earth from the sun is 92,960,000 which is 258% of the mean distance of mercury from the sun. What is mercury’s mean distance from the sun in ten millions of miles?

*February 28, 2016*

**MATH PLEASE**

0.0293262879789 Rounded to nearest hundredth percent.

*February 17, 2016*

**MATH HELP**

Determine the annual dividend and the annual yield to the nearest hundredth of a percent. Joyce buys 350 shares of KOW, Inc, that has a high of 42.50 per share and a low of 23.60. Last year the company paid annual dividends of $0.58 per share. (a) What is the total annual ...

*February 17, 2016*

**MATH HELP**

Determine the annual dividend and the annual yield to the nearest hundredth of a percent. Ella Franklin owns 325 shares of ITA stock. Purchase price was 37.85 per share dividends are 1.11 per share

*February 17, 2016*

**MATH**

Ben Garrison invested $15,000 at 5% compounded daily in a credit union account that matures in 1 year. He also invested 20000 at 5.25% compounded monthly in a Silver Screen account that matures in 4 years. (a) What is the interest earned at maturity for both accounts? (b) What...

*February 12, 2016*

**Math**

May Wattson has 50000 to invest in a 4-year certificate of deposit that earns an interest rate of 3.75% compounded monthly or 3.50% compounded daily. Based on annual yield which is the better investment?

*February 12, 2016*

**MATH**

Mabel has $35,000 to invest in a certificate of deposit for 4 years. The certificate of deposit earns interest at 4.75% compounded daily. What is the annual percentage yield to the nearest thousandth of a percent?

*February 12, 2016*

**MAth**

I got that also but its not correct and its driving me crazy

*February 12, 2016*

**MAth**

Tammy Smith Deposits $5000.00 in First Internets Bank 5-year CD which pays 5.22% interest compounded monthly how much interest will she have in the account in 5 years?

*February 12, 2016*

**Physics**

Two ropes attached to a young tree are pulled by two landscapers. Rope 1 is pulled with 267 N of force at an angle of 23 degrees north of east and Rope 2 is pulled with 377 N of force due west. a) Determine the magnitude and direction of the resultant force acting on the tree ...

*February 4, 2016*

**Math**

Got it. Thank you for clearing that up!

*February 3, 2016*

**Math**

Find the intervals on which the function is increasing, decreasing, concave up, or concave down and find any local extreme values and inflection points. So I know how to do the above, but not with piece wise functions. Someone help me out? Y={3-x^2, x<0 and x^2+1, x>=0} ...

*February 3, 2016*

**Physics**

Two ropes attached to a young tree are pulled by two landscapers. Rope 1 is pulled with 267 N of force at an angle of 23 degrees north of east and Rope 2 is pulled with 377 N of force due west. a) Determine the magnitude and direction of the resultant force acting on the tree ...

*February 3, 2016*

**Physics**

Two ropes attached to a young tree are pulled by two landscapers. Rope 1 is pulled with 267 N of force at an angle of 23 degrees north of east and Rope 2 is pulled with 377 N of force due west.

*February 3, 2016*

**Intro to Paralegalism I**

In what state a person may take the bar examination without a formal legal education?

*January 23, 2016*

**calculus**

It is estimated that t years from now, the value of a small piece of land, V(t), will be increasing at a rate of 1.6t^3/(0.2t^4+8100)^(1/2)dollars per year. The land is currently worth $420. Find V(t) and also find the value of the land after 10 years to the nearest cent.

*January 12, 2016*

**Business Law**

In trademark term, what is acquiring secondary meaning?

*January 10, 2016*

**Check My work ( math)**

are they correct

*January 7, 2016*

**Check My work ( math)**

1.) Years: 1 2 3 4 5 6 7 8 Height: 2.1 3.2 6.8 7.3 11.2 12.6 13.4 15.9 about about tall would you expect these trees to be after 22 years ? a.)22.31 ft b.)35.2 ft c.)44.25**** d.)46.2ft 2.)temp:68 77 83 85 89 94 96 99 number of cones:403 447 457 465 489 503 543 576 what is the...

*January 7, 2016*

**buisness communication**

Repeating in your own words the verbal content of the critic's message is: paraphrasing. checking for feelings. checking for inferences. buying time with limited agreement.

*January 6, 2016*

**Math**

It should be plus and minus 1 though right?

*January 4, 2016*

**Math**

y=arccos(sin(x)), find dy/dx. I got -1, is this correct? When I tried to check on wolfram alpha I didn't get this right.

*January 4, 2016*

**Math**

Okay, what you say makes sense, but what do I do with the (Pi/2)?

*January 4, 2016*

**Math**

y=arccos(sin(x)), find dy/dx and sketch it's graph(I guess I can do this on wolframalpha after I'm done solving the question). And by arcsin I mean inverse of the expression(written like cos^-1(sin(x)), but is not 1/cos(sinx) but the inverse of cos). I am not getting ...

*January 4, 2016*

**Math**

Write an equation for the tangent to the curve y=sinmx at the origin. I got y=mx, is this correct? Please help by showing work! Thanks

*January 3, 2016*

**Math**

But I was wondering- is it possible to use the (f•g)'= f'(g(X))*g(X)' and still obtain the same answer? For the composite rule, we sub u into the dv/du equation and then take the derivative of that ONCE. Then we multiply that entire function by pi which is the...

*January 2, 2016*

**Math**

This looks right! Thanks so much!!

*January 2, 2016*

**Math**

If f(u)=u+1/(cos^2u) , u=g(x)=pi(x), x=1/4 , find the derivative of f(g(x)). I can't seem to get this one, step by step please?

*January 2, 2016*

**Math**

A line 'l' intersects line 'm' at point A at 45 degree angle. B and C are points on line m, where the distance from B to A is equal to the distance from A to C. How many points on line 'l' are equidistant from points B and C? How is it one point? And ...

*December 29, 2015*

**Math**

Derivative of y=sec(tanx)? I don't get how it is secxsecx*secxtanx*tanxtanx. Where does an extra tanx come from? Derivative of sec(tanx) is just secxtanx*tanx (and then multiply the inside as well so)* sec^2(X) as derivative of tanx. I have 2 tanx, where did the third one ...

*December 27, 2015*

**Math**

So the answer is supposed to be sin(2x)/(1+cosx)^3 but I was wondering for the numerator why the distributive law doesn't apply when we would multiply the derivative of the outside with the inside?

*December 27, 2015*

**Math**

Wait sorry, you just expanded. But shouldn't it be sin times sin? Not sin times cos? Since derivative of the 1+cos is -sin and the numerator is a sin?

*December 27, 2015*

**Math**

I think you did the quotient rule wrong. Should be minus not plus

*December 27, 2015*

**Math**

Find the derivative of y=(sinx/(1+cosx))^2. I used the chain rule, but the second part involved the quotient rule which gives a very complicated expression that u do not know how to simplify. Could you please give me a detailed step by step solution for the simplifying part? ...

*December 27, 2015*

**Math**

So I found the derivative of an expression and I cannot figure out how to simplify the final answer into the desired form. I got -csc^2(X)/(1+cotx)^2. Now how do I simplify this into -1/(sinx+cosx)^2. Help, it's killing me ahha. Thanks!

*December 23, 2015*

**Math**

Wait sorry, scratch all of that. How did you get df/dg????

*December 17, 2015*

**Math**

Could you please explain how dg/dx is 6 over 2times square root of x?

*December 17, 2015*

**Math**

Was wondering where the y and X came out of? I thought it was just f and u?

*December 17, 2015*

**Math**

find value of (f•g)'(x) at x=1 for f(u)=cot(pi*u/4), u=g(x)=6(square root(x)) By the way, the little dot is supposed to be hollow above, as in f of g of x.

*December 17, 2015*

**Math**

Find the equation of the line tangent to curve x=sec(t), y=tan(t), at t=pi/6. I found th slope(derivative of the two which was csc(t). Plugged in Pi/6 and got 2 as the slope. Now how do I find the equation of the tangent? There are like two equations to work with, I'm ...

*December 17, 2015*

**Math**

Find values of x for which the piecewise function g(x): 1) (x+1)^2, x=<0 2) 2x+1, 0<x<33) (4-x)^2, x>=3is differentiable. I got xer, x cannot equal 3 and 0, but the answer key only has 3. WHy isn't 0 one either since the derivative is different on either sides?

*December 15, 2015*

**Math**

graph is a piecewise; f(x)= 1) 2-2x-x^2, x<0 and 2) 2x+2, x>=0. Determine whether graph has a tangent at x=o. If it does not, explain why not. I have no idea. When I plug in x=0, both equations give 2, but answer key says it does not exist. Explain?

*December 13, 2015*

**Math**

how is 2*6.1 equal to 32.2??

*December 13, 2015*

**Math**

Free fall equation is s=6.1t^2 ft, where t is in seconds. Assume a rock is dropped from a 100 ft cliff. Find speed of the rock at t=3.5 sec.

*December 13, 2015*

**Math**

lim (tanx-2x)/(2x-sinx) as X->0 I have no idea how to manipulate the units and isolate something that will somehow give me -1? Thanks in advance!!

*December 9, 2015*

**calculus**

Find the critical numbers x1 and x2 of y=(9x^2+3)/4x.

*December 7, 2015*

**calculus**

Use implicit differentiation to find the slope of the tangent line to the graph of 18*x^(1/2)+5y^(1/2)+14 at(81/324,1)

*December 7, 2015*

**calculus**

Find the derivative of y=(7x^(1/3))/(x^2+9)

*December 7, 2015*

**calculus**

Find the derivative of 4sinx(6cosx+9sinx) at x=¦Ð/6.

*December 7, 2015*

**calculus**

Use the Trapezoidal Rule to approximate ¡Ò8 4 ln(x2+5) dx using n=3. Round your answer to the fourth decimal place.

*December 2, 2015*

**Chemistry**

Determine the number of moles of N2 that are required to produce 12 mol of NH3 using the equation, N2 + 3H2 --> 2NH3. 12 mol NH3 x 1 mol N2/2 mol NH3 = 6 moles of N2.

*November 29, 2015*

**finite math**

discuss the argument that the y-intercept and the x-intercept should each be represented as separate ordered pairs.

*November 16, 2015*

**Math**

What is the expected number of rolls of both dice until you get a sum that equals 6? I know that p[sum = 6] = 5/36, but how do I find out: E[# of rolls until the sum = 6] = ? Thanks!!

*November 14, 2015*

**Math (algebra)**

Multiply (3x – 7)(3x – 5) A. 9x^2 + 6x + 35 B. 9x^2 + 36x + 35 C. 9x^2 – 36x – 35 D. 9x^2 – 36x + 35 I said it was letter A, but I got it wrong...please help

*November 10, 2015*

**Calculus **

The rate of growth dP/ dt of a population of bacteria is proportional to the square root of t with a constant coefficient of 9, where P is the population size and t is the time in days (0¡Üt¡Ü10). The initial size of the population is 700. Approximate the...

*November 9, 2015*

**calculus**

Evaluate ¡Ò(1+xe^x)/x dx

*November 6, 2015*

**calculus**

Evaluate ¡Ò(9tanxcosx+5)dx

*November 6, 2015*

**Math**

Hmm the answer key says 8.1. I got the same answer you did.

*November 5, 2015*

**Math**

Light passing through water loses 30% of its intensity every metre of water depth. At what depth will the light intensity be half of what it is at the surface? How is it 8.1? I don't know how. Thanks

*November 5, 2015*

**calculus**

A Norman window is constructed by adjoining a semicircle to the top of a rectangular window . (The diameter of the semicircle is the same as the width of the rectangular) If the perimeter of the Norman window is 20 ft, find the dimensions that will allow the window to admit ...

*November 4, 2015*

**Math**

I am given a graph and asked to derive the function from it. The answer key says y=(-3x^2-5)/(x^2-25)- use wolfram to graph for your convenience. I got the asymptotes but the -5 constant I don't get where it came from. Someone explain to me how to get that -5 constant?(I ...

*October 16, 2015*

**Math**

Why do we have to sub it back into the original function to get 0/0? If we got 0/x then it means it's a vertical asymptote right? and what about the oblique asymptote? We don't worry about it then?

*October 15, 2015*

**Math**

What is the: - vertical asymptote -horizontal asymptote -non permissible value of y=(x^2+x-12)/(x+4) ? So this simplifies to a linear function y=x-3. BUT the oblique asymptote is also y=x-3. So does this graph not exist? I am really confused.

*October 15, 2015*

**Math**

What's the volume function?

*October 1, 2015*

**Math**

A rectangular piece of metal with dimensions 14 CMA 24 CM is used to make an open box equal squares of side length X centimeters are cut from the corners and sides are folded up a polynomial function that represents the volume, V,of the box is: V(X)=x(14-2x)(24-2x). Determine ...

*October 1, 2015*

**Math**

500! is divisible by 21. How many times can 21 go into 500! ? The answer key does not simply state 500!/21 times, and my calculator does not have the capacity to compute such a large sum. Thanks!

*September 27, 2015*

**English**

Yes. Is this right?

*September 23, 2015*