All questions will be solved using derivative rules EXCEPT the first question. Communication marks are given for neat, organized solutions with therefore statements and units.

Find the derivatives of the following using derivative rules. You must show all steps to get full marks. Make sure you simplify your answers as much as possible. Do not expand any brackets larger than squared. a) f(x) = (4x 7 10)5(x5 * 2x2 + x):3 c) a = (8:33 70!: 5t2+6 model the concentration (in grams/litre} of the chemical in a nearby stream, where t is the time (in days) since the spill. Determine how fast the concentration is decreasing when it reaches 3 grams per litre (answer to three decimal places). is used to When a chemical from a factory is spilled into a lake, the function C(15)