Piecewise Function: A part-timer who works at WNNR Fastfood earns Php 90 per hour for the first 20 hours of work and Php 117 per hour in excess of 20 hours. Cre.te a piecewise function that determines the amount of her paycheck. Rational Function: Simple Interest (manipulating equations) Exponential Function: Radioactive Substances Logarithmic Function: Exponential growth (manipulating equations)