Friday
August 29, 2014

Posts by Cal


Total # Posts: 58

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

statistics
85%
February 15, 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 dont 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 DONT 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 many ...
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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