anonymous
  • anonymous
Sketch the points given. Use rectangles to estimate the distance traveled by the rocket over the first 120 seconds as directed. (a) ... using 3 subintervals of equal width and the midpoint for sample points. http://i48.tinypic.com/65ac1e.jpg
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I tried using the rieman sum midpoint but I keep getting it wrong!!!!
anonymous
  • anonymous
how are you supposed to divide 140 in to three sub intervals? got me.
anonymous
  • anonymous
It changed it to 120

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anonymous
  • anonymous
i guess each has length of \(46\tfrac{2}{3}\) and you take the midpoint so first sample point would be at \(23\tfrac{1}{3}\)
anonymous
  • anonymous
you just ignore the 140 I guess
anonymous
  • anonymous
well that makes it easier
anonymous
  • anonymous
so it would be 30
anonymous
  • anonymous
no one third of 120 is 40
anonymous
  • anonymous
oh crap I thought it was four intervals
anonymous
  • anonymous
one interval would be \([0,40]\) next would be \([40,80]\) and last would be \([80,120]\) you would sample as \(20,60,100\)
anonymous
  • anonymous
*sample AT
anonymous
  • anonymous
so it would be 40[ f(20)+f(60)+f(100)] ?
anonymous
  • anonymous
yes that should do it
anonymous
  • anonymous
@satellite73 but it talks about rectangles so for each interval do I just do the X*y?
anonymous
  • anonymous
It's still wrong. :(
anonymous
  • anonymous
yes it is just rectangles, base times height
anonymous
  • anonymous
is the last 140,8 gone or something?
anonymous
  • anonymous
40[(2*20)+(4*20)+(8*20)]
anonymous
  • anonymous
I don't know, but this is what I did using base times height
anonymous
  • anonymous
and it's still wrong
anonymous
  • anonymous
oh i see what you did wrong
anonymous
  • anonymous
the base if 40, the height is 2, 4 and 8 respectively
anonymous
  • anonymous
you wrote \(40[ f(20)+f(60)+f(100)]\)
anonymous
  • anonymous
that is correct, and \(f(20)=2,f(60)=4, f(100)=8\) so it should be \[40(2+4+8)\]
anonymous
  • anonymous
OH -_- wow. thanks :P I knew I was doing something too much
anonymous
  • anonymous
:)

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