Using the figure below, draw rectangles representing each of the following Riemann sums for the function f on the interval 0 ≤ t ≤ 8. Calculate the value of each sum.

(a) Left-hand sum with Δt = 4

(b) Right-hand sum with Δt = 4

(c) Left-hand sum with Δt = 2

(d) Right-hand sum with Δt = 2

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