Exam 13: The Integral

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The marginal cost of producing the xth box of computer disks is 2+x2120,0002 + \frac { x ^ { 2 } } { 120,000 } and the fixed cost is $120,000. Find the cost function C(x)C ( x ) .

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Find f(x)f ( x ) if f(4)=8f ( 4 ) = - 8 and the tangent line at (x,f(x))( x , f ( x ) ) has slope 7ex+47 e ^ { x } + 4 . ?

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Calculate the left Riemann sums for the function over the given interval, using the given values of n. (When rounding, round answers to four decimal places.) f(x)=x1+x2f ( x ) = \frac { x } { 1 + x ^ { 2 } } over [0,2],n=5[ 0,2 ] , n = 5

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D

The rate of change r(t)r ( t ) of the total number, in thousand of articles, of research articles in the prominent journal Physics Review written by researchers in Europe is shown in the graph, where t is time in years t=0t = 0 represents the start of 1983). Use both left and right Riemann sums with 8 subdivisions to estimate the total number of articles in Physics Review written by researchers in Europe in the 16-year period beginning 1983. (Estimate each value of r(t)r ( t ) to the nearest 0.5). Use the sums to obtain an estimate of 016r(t)dt\int _ { 0 } ^ { 16 } r ( t ) d t .  The rate of change  r ( t )  of the total number, in thousand of articles, of research articles in the prominent journal Physics Review written by researchers in Europe is shown in the graph, where t is time in years  t = 0  represents the start of 1983). Use both left and right Riemann sums with 8 subdivisions to estimate the total number of articles in Physics Review written by researchers in Europe in the 16-year period beginning 1983. (Estimate each value of  r ( t )  to the nearest 0.5). Use the sums to obtain an estimate of  \int _ { 0 } ^ { 16 } r ( t ) d t  .

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Evaluate the integral. 3424x2x316 dx\int _ { 3 } ^ { 4 } \frac { 24 x ^ { 2 } } { x ^ { 3 } - 16 } \mathrm {~d} x

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Evaluate the integral. 2x7(x2+7x+7)3 dx\int \frac { - 2 x - 7 } { \left( x ^ { 2 } + 7 x + 7 \right) ^ { 3 } } \mathrm {~d} x

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The way Professor Waner drives, he burns gas at the rate of 1e3t1 - e ^ { - 3 t } gallons each hour, t hours after a fill-up. Find the number of gallons of gas he burns in the first 13 hours after a fill-up. Please round the answer to the nearest gallon.

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Calculate the left Riemann sum for the function over the given interval using the given values of n. f(x)=6x2f ( x ) = 6 x - 2 over [0,2],n=4[ 0,2 ] , n = 4

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Evaluate the integral. (x2.653.4)dx\int \left( \frac { x ^ { 2.6 } } { 5 } - 3.4 \right) d x

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Evaluate the integral. x(x2+2)2.5 dx\int x \left( x ^ { 2 } + 2 \right) ^ { 2.5 } \mathrm {~d} x

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Calculate the Riemann Sum for the integral using n = 5. 0134+xdx\int _ { 0 } ^ { 1 } \frac { 3 } { 4 + x } d x ? Give the answer correct to two decimal places.

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Calculate the left Riemann sums for the function over the given interval, using the given values of n. (When rounding, round answers to four decimal places.) f(x)=exf ( x ) = e ^ { - x } over [5,5],n=5[ - 5,5 ] , n = 5

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The velocity of a particle moving in a straight line is given by v=e3t+3tv = e ^ { 3 t } + 3 t . Find an expression for the position s after a time t.

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A car traveling down a road has a velocity of v(t)=553et16v ( t ) = 55 - 3 e ^ { - \frac { t } { 16 } } mph at time ?t hours. Find the total distance it travels from time t=1t = 1 hours to time t=5t = 5 hours. (Round your answer to the nearest mile.)

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A model rocket has upward velocity v(t)=60t2ftsv ( t ) = 60 t ^ { 2 } \frac { \mathrm { ft } } { \mathrm { s } } , t seconds after launch. Use a Riemann sum with n = 10 to estimate how high the rocket is 4 seconds after launch.

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Evaluate the integral. x(x2)3 dx\int x ( x - 2 ) ^ { 3 } \mathrm {~d} x

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Evaluate the integral. (1+24.3e2.7x4)dx\int \left( 1 + 24.3 e ^ { 2.7 x - 4 } \right) \mathrm { d } x

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Calculate the total area of the region bounded by the line y=15x2+13y = 15 x ^ { 2 } + 13 , the x-axis, and the lines x=9x = 9 and x=16x = 16 .

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The velocity of a particle moving in a straight line is given by v=t(t2+4)4+5tv = t \left( t ^ { 2 } + 4 \right) ^ { 4 } + 5 t . Given that the distance s=0s = 0 at t=0t = 0 , find an expression for s in terms of t without any unknown constants.

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Evaluate the integral. ? (ex+x912)dx\int \left( - e ^ { x } + x ^ { - 9 } - \frac { 1 } { 2 } \right) d x ?

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