c. The simplest part is finding the equilibrium point "mathematically" (it is better to say "algebraically"). For this, we have to equate `Q_d` and `Q_s:` `50-10P_x = 10P_x.` This is a simple linear equation that becomes `50 = 20 P_x` and `P_x = 2.5` (units are probably $/kg). The supply and demand are both equal to `25` at this point. We obtain the same result looking at a graph.
b. The graphs are simple, too. They are both straight lines. Please look at this link: https://www.desmos.com/calculator/zngt7rj9fr
a. The schedule is simply a table that lists some possible price (`P_x`) values and the corresponding `Q_d` and `Q_s` values. We may choose the step between the `P_x` values. Let it be 1 $/kg:
`P_x` `Q_d` `Q_s`
1 40 10
2 30 20
3 20 30
4 10 40
You can extend this table with `P_x` values 0.5, 1.5 and so on.