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L33 - 12 Now You Try It (NYTI): ▯ x 1. Let f(x)= ln(t)dt. Find each interval on which f is concave up. 1 t 4 2. Find the area bounded between the x-axis and the graph of f(x)=2 − x on the interval [0,4]. Sketch the region, and note that the curve takes on negative values. n ▯ ▯ ▯ 4i 2 3. Expressn→∞m 2+ 2 as a definite integral, and use it to evaluate i=1 n n the limit.