Before doing an explore-plot command I had given constant or expression assignments to certain parameters in preliminary statements, e.g.

k = 4* 10^-5 ;

mpg_o = 45;

mpg_ave = mpg_o - k*(m_d /2 );

mpg_mave = mpg_o - k*(m / 2);

Then I did an explore-plot :

Explore(plot(7.28*m*( (1/mpg_mave) - (1/mpg_{ave) ) ,}

The expression below is not producing any plot, although the axes and sliders are set :

I'd like to be able to plot a function that not only has a range for the dependent variable(s) but also for any "variable constants" that may be in the expression.

For example, if I wanted to plot the following expression :

                    y = A sin(wx + c)

and also to explore its behaviour over the following ranges for A, w and c :