Translation for the image: 1. (a) Read the values from the graph given of , use five rectangles to find an estimation inferior and superior for the area under the graph given of , from to . In each case, draw the rectangles you use. (b) Find new estimations using ten rectangles in each case.

2. Use twelve rectangles to find an estimation for the area under 's graph from to .

For the next functions a) graph and use Riemann sum to determine the area under the curve described for said functions in the given intervals, for b) 10, c) 100, d) 1000, f) and infinite rectangles.
3. , interval
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5. , interval