Calculus
The function f is continuous on the interval [4, 15], with some of its values given in the table above. Estimate the average value of the function with a Trapezoidal Approximation, using the 4 intervals between those given points.
x 4 9 11 14 15
f(x) 6 11 18 21 25
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Jimmy

for each trapezoid number i the area is
(f(x_i)+f(x_i+1))/2 * (x_i+1  x_i)posted by Steve
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