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What is the value of the left Riemann sum approximation to intergal 0 to 50 f(x)dx using the sub intervals [ 0,25] , [25,30] , [30,50] ?

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that would be just three rectangles
25f(0) + 5f(25) + 20f(30)

That is,

2
∑ f(x_{_k}) ∆x_{_k}
k=0

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