3. Consider the function for r +0 f(r) = 1 %3D for r = 0. (b) Divide the interval [-1,1] into 2n parts. Approximate the area under the curve by rectangles, using... i. ..the left endpoint on subintervals of [-1,0] and the right endpoint on subin- tervals of [0, 1].

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A: Find the area under the curve y = x3 + 3x2 and the x-axis between x = 1, and x = 3.

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Q: 1) Find the area of the region above the x axis and to the left of the line x = 1 bounded by the x…

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A: I have provided solution in  step2.

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A: L4 is the left endpoint of the expression with 4 approximating rectangles.

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Q: B) Compute the area under the curve of the function f(x) = x(3x – Vã), between x = 1 and x = 4.

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A: To find the total area between the curve of the function f(x)=−4x+8 and the x-axis over the interval…

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Q: (Area Under a Curve)

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