# Posts by CAL

Total # Posts: 67

**Mulitvariable Calculus**

Couldn't find any proofs for these Maybe a link would be great] Thanks

*December 8, 2015*

**Mulitvariable Calculus**

How to proof tangential and normal components of a vector Thank you

*December 8, 2015*

**CHEMISTRY!**

Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation for this is S2 (g) + C (s) <---> CS2 (g) Kc = 9.40 at 900 K How many grams of CS2 (g) can be prepared by heating 11.7 moles of S2 (g) with excess carbon in a 5.95 L reaction vessel at 900 ...

*October 14, 2015*

**chem intro**

The rate of the following reaction is 0.90 M/s. What is the relative rate of change of each species in the reaction below? A + 3B --> 2C

*September 10, 2015*

**chemistry**

How many moles of magnesium are needed to react with 16 g of O2? 2 MgO (s) + O2 (g) → 2 MgO (s)

*October 22, 2014*

**Math**

Yes.

*September 7, 2014*

**Calculus - Compound Interest**

Recently, a certain bank offered a 10-year CD that earns 8.93% compounded continuously. a) If $20,000 is invested in this CD, how much will it be worth in 10 years? Ans: I used the formula A = Pe^(rt) to get the answer $48,848.92 b)How long will it take for the account to be ...

*November 3, 2013*

**cal**

Determine all values of x, (if any), at which the graph of the function has a horizontal tangent. y(x) = 6x/(x-9)^2 when i workout this problem I get this: by quotient rule: dy/dx = ( (x-9)^2 (6) - 6x(2)(x-9))/(x-9)^4 = 0 at a horizontal tangent 6(x-9)^2 - 12x(x-9) = 0 6(x-9)[...

*October 25, 2013*

**cal**

from the ans choices i choose: dy/dx= - 4x^2/x^2+1 is that right

*October 24, 2013*

**cal**

Find dy/dx by implicit differentiation given that tan(4x+y)=4x

*October 24, 2013*

**cal**

dy/dx = 3x^2+8+13x^12y / 6y^5-x^13

*October 24, 2013*

**cal**

Find dy/dx by implicit differentiation. x^3+8x+x^13y-y^6=4

*October 24, 2013*

**cal**

I have these ans choices: A. f= 63x(7+3x^3)^5 (14+60x^3) B. f= 63x(7+3x^3)^5 (14+63x^3) C. f= 63x(7+3x)^5 (14+63x^3) D. f= 63x(7+3x^3)^5 (14-60x^3)

*October 24, 2013*

**cal**

Find the second derivative of the function. f(x)= (3x^3+7)^7

*October 24, 2013*

**cal**

thanks jai

*October 24, 2013*

**cal**

am lost

*October 24, 2013*

**cal**

but the ans is f(x)= x^7(80-51x)/2√5-3x

*October 24, 2013*

**cal**

Find the derivative of the function. f(x)= x^8√5-3x

*October 24, 2013*

**cal**

Use the Product Rule to differentiate f(u)= √u (5-u^6)

*October 24, 2013*

**cal Reiny!!!!!!!!!!**

I have these answer choices: x=9 and x=6 x=-9 x=-9 and x=6 x= 6 The graph has no horizontal tangents.

*October 23, 2013*

**cal**

Determine all values of x, (if any), at which the graph of the function has a horizontal tangent. y(x) = 6x/(x-9)^2

*October 23, 2013*

**cal**

I got it. Never mind.

*October 22, 2013*

**cal**

Use the Quotient Rule to differentiate the function. f(x)= 8x/x^5+3

*October 22, 2013*

**cal**

Find the slope of the graph of the function at x = 5. f(x)= -2x^2+6/x^2

*October 22, 2013*

**Math - Limits/Derivatives**

The demand x is the number of items that can be sold at a price of $p. For x = p^3 - 4p + 400, find the rate of change of p with respect to x by differentiating implicitly.

*October 21, 2013*

**Math**

Thank you! How would I solve 1 = (12960 - 0.1x^2) / 0.2x^2

*October 20, 2013*

**Math**

Can I simplify (12960 - 0.1x^2) / 0.2x^2 any further? How?

*October 20, 2013*

**math**

Solve n + 1 = -4

*August 2, 2012*

**math**

what are the first three terms of the sequence a1=2 and an=3(an-1)2

*March 1, 2012*

**statistics**

85%

*February 15, 2012*

**physics**

0 m/s ^2

*February 6, 2012*

**math**

what if i have 6 1/2 ft of lumber and i only need 3/5 how much is itZ?

*January 18, 2012*

**math**

subtract 31 m-31=r

*October 12, 2011*

**algebra**

Andrew factored the expression 28x©ø-6x©÷-10x as 2x(14x©ø-3x©÷-5x) . But when Melissa applied the distributive law and multiplied out 2x(14x©ø-3x©÷-5x), she got 28x©ù-6x©ø-10x©...

*June 12, 2011*

**algebra**

The area of a rectangular athletic field is represented by the expression 16y²-49z² square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include correct units ...

*June 12, 2011*

**Algebra**

If g(x)=3x-5, then g inverse(x)=

*May 25, 2011*

**english**

Im in third grade and i don't understand colons.i have to proofread a paragraph and combine them using colons.

*December 8, 2010*

**Alg2**

A piece of wood discovered in an archaeological dig was found to have lost 62% of it's carbon-14. Carbon-14 has a half-life of 5630 years. Determine it's age.

*June 1, 2010*

**physics**

What is the energy of a photon that has the same wavelength as a 12-eV electron? (h = 6.63 × 10-34 J×s)

*April 23, 2010*

**physics**

If three unequal capacitors, initially uncharged, are connected in series across a battery, which of the following statements is true? 1 The equivalent capacitance is greater than any of the individual capacitances. The capacitor with the smallest capacitance has the smallest ...

*January 29, 2010*

**physics**

A battery is attached across several different capacitors connected in series. Which of the following statements are true? 1 The capacitor with the largest capacitance carries the largest charge. All the capacitors have the same charge, and the equivalent capacitance is ...

*January 29, 2010*

**physics**

A helium nucleus (charge = 2e, mass = 6.63 10-27 kg) traveling at a speed of 6.20 105 m/s enters an electric field, traveling from point circle a, at a potential of 1.50 103 V, to point circle b, at 4.00 103 V. What is its speed at point circle b?

*January 29, 2010*

**physics**

The electric potential at x = 3.0 m is 120 V, and the electric potential at x = 5.0 m is 190 V. What is the electric field in this region, assuming it's constant?

*January 29, 2010*

**physics**

After a parallel-plate capacitor is charged by a battery, it is disconnected from the battery and its plate separation is increased. Which of the following statements is correct?

*January 29, 2010*

**physics**

A proton is released at the origin in a constant electric field of 850 N/C acting in the positive x-direction. Find the change in the electric potential energy associated with the proton after it travels to x = 2.5 m.

*January 29, 2010*

**4th grade**

what is the rule for ___,68,___,94,___,120

*September 25, 2009*

**Pre-Cal**

Find the standard form of the equation of the ellipse. (Remember center is midpoint between either foci or vertices) (1) 9x^2+4y^2+36x-24y+36=0 (2) Vertices: (0,5)(0,-5) Passes through the point (4,2) Centered at the origin

*April 19, 2009*

**math**

I HAVE THESE ANSWERS FOR THE PROBLEMS. COULD YOU DOUBLE CHECK PLEASE, THIS IS A PRACTICE QUIZ WHICH ISN'T A GRADE IT JUST HELPS ME GET READY FOR THE TEST. 1) a 2) b 3) d 4) a 5) d 1. Solve x^3 + 6x^2 + 13x + 10 = 0. a) –2 + 2i, –2 –2i, –2 b) 2 + i, 2 &#...

*October 7, 2008*

**math**

1) a 2) b 3) d 4) a 5) d

*October 7, 2008*

**math**

it is not a test, it is a practice quiz they helped us make in order to prepare for the test, I just want help double checking my answers

*October 7, 2008*

**math**

Could you please solve so I can double check my answers for the practice quiz? Thank You!! 1. Solve x^3 + 6x^2 + 13x + 10 = 0. a) –2 + 2i, –2 –2i, –2 b) 2 + i, 2 – i, –2 c) –2 + i, –2 – i, –2 d) 2 + 2i, 2 – 2i, –2 2. ...

*October 7, 2008*

**math**

I am also having trouble with this one, thanks! If y varies jointly as x and the cube root of z, and y=120 when x=3 and z=8, find y when x=4 and z=27.

*September 30, 2008*

**math**

I am having trouble with this problem, thanks! If y varies jointly as x and the cube of z, and y=378 when x=4 and z=3, find y when x=9 and z=2 .

*September 30, 2008*

**Critical Thinking**

my answer is Since 1975, 35 retarded people have been executed; people whose IQ is below 70. Of the nations that have executed people for crimes committed below the age of 18 since 1990, they are these nations: Iran, Nigeria, Pakistan, Saudi Arabia, Yemen and the nation that ...

*May 3, 2008*

**Critical Thinking**

Identify any examples of bias presented by the author. If none exist, explain how you determined this. Until his death in 2003, Paul Simon was a professor at Southern Illinois University, where he taught classes in political science, history, and journalism, and served as ...

*May 3, 2008*

**Critical Thinking**

Capital Punishment Does Not Make Nation Safer Identify and name any rhetorical devices used by the author. If none exist, explain how you determined this. Until his death in 2003, Paul Simon was a professor at Southern Illinois University, where he taught classes in political ...

*May 2, 2008*

**algebra 2**

Just one more.. Thanks for the last one! 16^(d-4) = 3^(3-d) solve for d

*March 11, 2008*

**math**

yes

*March 11, 2008*

**math**

7^t-2 = 5^t

*March 11, 2008*

**chem**

What is the sum of the coefficients (including “1”) of the following reaction? Sodium sulfate + calciumhydroxide--> ???

*February 29, 2008*

**algebra 2**

Could you help me on solving these please? thanks -135 = -5b^-3 and -9.6=-.3b^x

*February 25, 2008*

**algebra 2**

PLEASE HELP wiTH ALL OF THEse. I DON'T KNOW WHERE TO START---THANKS! 1. At 2pm the number of bacteria in a colony was 100, by 4pm it was 4000. Write an exponential function to model the population y of bacteria x hours after 2pm. 2.Using the information in problem 1, how ...

*February 24, 2008*

**alg 2**

write an exponential function whose graph passes throught the given points... (0,3)and (1,15)...(0,-5)and(-3,-135)...(0,-0.3)and(5,-9.6)

*February 14, 2008*

**chemistry**

I posted under my friends name accidentally.. but number 2 is .2 because I found molar mass. Number 3 4 and 5 is where I get lost

*February 12, 2008*

**chemistry**

What is the sum of the coefficients (including “1”) of the balanced equation? __CaCO3 + __NaF __ CaF2 + __Na2CO3 4 5 6 7 8 If you start with 20.0 grams CaCO3, how many moles of CaCO3 do you have? 20.0 2.00 .200 .0200 .0386 If you start with .500 moles of NaF, how ...

*February 12, 2008*

**Social studies**

Was John Cabot Married? He was married in 1492, and had three sons: http://en.wikipedia.org/wiki/John_Cabot

*February 15, 2007*

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