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f(x) = 2x  from  a = 4  to  b = 5 (a) Approximate the area under the curve from a...

f(x) = 2x  from  a = 4  to  b = 5

(a) Approximate the area under the curve from a to b by calculating a Riemann sum using 5 rectangles. Use the method described in Example 1 on page 351, rounding to three decimal places.
  square units

(b) Find the exact area under the curve from a to b by evaluating an appropriate definite integral using the Fundamental Theorem.

   square units

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