Write the Definite Integral

Question

Write the definite integral for the summation:  .

Question options:

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Answer 1

This is right integral sum for function f(x) = x² and interval [a,b] = {4, 7] and n is number of subdivisions.

And because right answer: this is integral from x = 4 to x = 7 from function f(x) = x² times dx