or each of the following, determine whether the equation represents exponential growth, exponential decay, or neither. (See Example 1 in this section.) (a) y = 4 x^1/2 exponential growth exponential decay neither (b) y = 5 (2/5)^x exponential growth exponential decay neither (c) s = 3 4 3t exponential growth exponential decay neither (d) s = t2 exponential growth exponential decay neither (e) y = 0.5 1.4z/5 exponential growth exponential decay neither (f) v = 2 0.85s exponential growth exponential decay neither