anonymous
  • anonymous
trapezoidal rule
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
solve: \[\int\limits_{9}^{16}\sqrt{x}\]
anonymous
  • anonymous
this is my approach but its not getting me the right answer: \[\int\limits_{9}^{16{x}}\sqrt{x}\approx \int\limits_{9}^{10}\sqrt{x}+ \int\limits_{10}^{11}\sqrt{x}+\int\limits_{11}^{12}\sqrt{x}+\int\limits_{12}^{13}\sqrt{x}+\int\limits_{13}^{14}\sqrt{x}+\int\limits_{14}^{15}\sqrt{x}+\int\limits_{15}^{16}\sqrt{x}\]
anonymous
  • anonymous
\[\approx 1/2(3+\sqrt{10}) + 1/2(\sqrt{10}+\sqrt{11}) + 1/2(\sqrt{11}+\sqrt{12}) + 1/2(\sqrt{12}+\sqrt{13}) + 1/2(\sqrt{13}+\sqrt{14}) + 1/2(\sqrt{14}+\sqrt{15}) +1/2(\sqrt{15}+4)\]

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watchmath
  • watchmath
Hi and, please write down the problem.
anonymous
  • anonymous
solve using the trapezoidal rule: \[\int\limits_{9}^{16}\sqrt{x}\] rounding to three significant figures
watchmath
  • watchmath
into how many sub intervals?
anonymous
  • anonymous
my answer is 20.9 and the answer in the text book is 27.9
anonymous
  • anonymous
i dont know where i went wrong this time
anonymous
  • anonymous
8 sub intervals
anonymous
  • anonymous
sorry 7 intervals
watchmath
  • watchmath
I got 24.66 http://www.wolframalpha.com/input/?i=%281%2F2%29%28sqrt%289%29%2B2sqrt%2810%29%2B2sqrt%2811%29%2B2sqrt%2812%29%2B2sqrt%2813%29%2B2sqrt%2814%29%2B2sqrt%2815%29%2Bsqrt%2816%29%29
watchmath
  • watchmath
Could you post the complete question exactly like what you have on your book?
anonymous
  • anonymous
ok one second
anonymous
  • anonymous
(a)complete this table of values for the function\[y=\sqrt{x}\] x 9 10 11 12 13 14 15 16 y (b) use the trapezoidal rule with the eight function values above to estimate \[\int\limits_{9}^{16}\sqrt{x} \] give your answers correct to three significant figures
anonymous
  • anonymous
wait you answer is right lol i rechecked the answer its 24.7
watchmath
  • watchmath
:D
anonymous
  • anonymous
sorry lol can u see where i went wrong
watchmath
  • watchmath
I am not sure, but it seems you forgot to add one of the expression when you plug in into your calculator.
anonymous
  • anonymous
ok ill try it out again
anonymous
  • anonymous
lol your right i left out one expression its 1 o clock in the morning lol im doing alot of stupid mistakes

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