The Calculus in a freshman core terminal class!!

The idea of slope extended beyond the straight line

Contrast a line with a parabola graphically and with a table on the TI-84 and equation wise (algebraically) so that students can see that the rate of change for a nonlinear function changes in a nonconstant manner)

Show the slope of line is the "m"

Write the slope formula using dy/dx or as delta y / delta x (using the Greek letter delta triangle thingie)