Recall that we can use the notation fo f () di to denote the area under the curve f (1) between t = a and 1 = b. 1. Consider the constant function f (1) = 4. (a) Using geometry, compute fi f (t) dt. (b) Similarly compute fi f (t) at and fi f (1) dt. Land worriiw of cel (c) Using your answers to parts (a) and (b) as a guide, compute ff f (t) dt for any x 2 1. (d) We now define the area function A (x) = fi f (t) dt, 1 s x 5 4. What is A (2)? A (2.5)? A (1)? Write a general formula for A (x)