# Posts by Cal

Total # Posts: 67

**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

**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**

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©...

**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.

**4th grade**

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

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