5. Let f(t) = 2t. We'll look at two area functions, off(x) and 3Af(x). As a reminder, off(x) = f(t ) at and 3As (x ) = f (t ) at . (a) Evaluate the following quantities. i. off (2) ii. off(-2) iii. 3Af (1) iv. 3Af(-2) (b) Using geometry and area based on the graph of f, find a formula (not involving an integral) for oAf(x), where x 2 0. (c) Does the formula you wrote in (b) work for negative x? Explain. (d) Find a formula (not involving an integral) for 3Af (x), where x 2 3. Does your formula work for x