# Posts by cal

Total # Posts: 68

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

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

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 ...

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

Art
It's the same person saying they have a 3/10 btw I got a 100%

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

Math
Yes.

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 ...

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)[...

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

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

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

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

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)

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

cal
thanks jai

cal
am lost

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

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

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

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.

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

cal
I got it. Never mind.

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

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

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.

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

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

math
Solve n + 1 = -4

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

statistics
85%

physics
0 m/s ^2

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

math
subtract 31 m-31=r

algebra

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 ...

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

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

math
21

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.

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)

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 ...

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 ...

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?

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?

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?

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.

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

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

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 &#...

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

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

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. ...

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.

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 .

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 ...

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 ...

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 ...

algebra 2
Just one more.. Thanks for the last one! 16^(d-4) = 3^(3-d) solve for d

math
yes

math
7^t-2 = 5^t

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

algebra 2
Could you help me on solving these please? thanks -135 = -5b^-3 and -9.6=-.3b^x

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 ...

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)

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

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 ...

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