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  1. T

    Average rate of change of a sphere

    i got it its 256\pi Used the instantaneous formula thing, i.e. the long way of derivative
  2. T

    Average rate of change of a sphere

    second part is: Find the rate of change of volume when the radius is 8cm... So that means the instantaneous rgight?
  3. T

    Average rate of change of a sphere

    answer says \frac{1900}{3}\pi
  4. T

    Average rate of change of a sphere

    the Volume of a sphere is given by V(r) = \frac{4}{3}\pi(r)^3 Find the average rate of change of volume with respect to radius as the radius changes from 10 cm to 15 cm. Ok what I tried is: \lim_{r\rightarrow 15} \frac{V(r)-V(a)}{r-a} P(a,V(a))=(15,14 137)\\ Let\ r=10 \lim_{r\rightarrow 15}...
  5. T

    Limits of polynomial functinos

    yes that is what i mean but somethign like f(x)=x+3 wouldn't work
  6. T

    Rate of movement of glacier

    LMAO hallsofivy!!! Right now I'm laughing my ass off LMAO God damnit!! thanks....lol I GOT IT btw how do you put spaces in between tex stuff,,,....it says its \\ but it doesn't work...look at my tex
  7. T

    Rate of movement of glacier

    d(t)=(0.01)t^2+0.5t, P(a,f(a))=(20,14)\\\lim_{h\rightarrow 0} \frac{(0.01(400-800h+h^2)+0.5(20+h)-14)}{h}\\ \lim_{h\rightarrow 0} \frac{(0.01h^2+8.5h)}{h}=8.5
  8. T

    Rate of movement of glacier

    The movement of a certain glacier can be modelled by d(t)=0.01t^2+0.5t where d is the distance in metres that a stake on the glaciers has moved, relative to a fixed position, t days after measurements began. Find the rate at which the glacier is moving after 20 days. What is the question...
  9. T

    Limits of polynomial functinos

    Invent a function and sketch its graph to satisfy each situation lim_x-0+ f(x)=3 and lim_x-0- f(x)=-2 I can't figure out an equation for that
  10. T

    Trouble with Tangent of a Line

    Thank you Mr Radou for your help and compliment
  11. T

    Trouble with Tangent of a Line

    omg I'm so smart because I got to that last step u said but didnt see that 1/10 +5 is 5.1....... but thats why i'm so stupid too i didnt see it
  12. T

    Trouble with Tangent of a Line

    thats what i did one sec
  13. T

    Trouble with Tangent of a Line

    ur not suggesting y-y1=m(x-x1) ??
  14. T

    Trouble with Tangent of a Line

    answer is x+10y-51=0 but whres the 51 from
  15. T

    Trouble with Tangent of a Line

    duh negative reciprocal
  16. T

    Trouble with Tangent of a Line

    but I have the slope....
  17. T

    Trouble with Tangent of a Line

    I tried many thigns with this one: Determine the equation of the line that is perpendicular to the tangent to y=5x^2 at (1,5) What I did was use the formula for instantaneous rate of change finding the equation of the secant. (5x^2-5)/(x-1) from there I found that the slope of the...
  18. T

    Inverse expressions

    answer says y=x^3
  19. T

    Inverse expressions

    yea ok but wait how do u find the inverse of like y=(x)^(1/3) y=3(2)^x whats the formula is not in the book BTW i can't do those equations in latex...
  20. T

    Exponential Growth etc

    i suck at this tex stuff i can't get the x^(1/3) and I wrote the y=3(2)^x first and it appeared second...wtf
  21. T

    Exponential Growth etc

    yea ok but wait how do u find the inverse of like y=3(2)^x or y=(x)^{1/3} whats the formula is not in the book
  22. T

    Exponential Growth etc

    yea i know that rule thanks guys
  23. T

    Exponential Growth etc

    the question is how do I solve (1.024)^t=2.857 and find "t" without using logarithms
  24. T

    Solve for X

    haha court <3
  25. T

    Solve for X

    Nevermind I Got It!!! Thanks You...i"m A Genious!
  26. T

    Solve for X

    god damnit got the wrong answer again... I thought u meant... loga+logb
  27. T

    Solve for X

    if thats not the way then how? its because of that stupid 3 in front
  28. T

    Solve for X

    the way i wrote it, I used the logarithm law...
  29. T

    Solve for X

    yea so u gotta find x
  30. T

    Solve for X

    Solve for X: 3(2)^x = 4(^x^+^1) I did: xlog3(2)=(x+1)log4 and got the wrong answer
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