Each function below describes how something changes. Use the description to determine if the function describes exponential growth, exponential decay, or is not an exponential function at all. (a) The strength of a beam is five times the square of its thickness. ---Select---
(b) The hydrogen ion concentration is equivalent to 10-P where p is pH. ---Select---
(c) The distance to a moon is given by d = kt5.2. ---Select---
(d) The amount of exhaust particles is cut in half each year. ---Select---
(e) The price of a share of stock decreases by 1.20 dollars per month. ---Select---