A$-6\mathrm{.}9$ a$)$ How would increasing the tail volume ratio change the longitudinal static stability of a conventional aircraft?

b$)$ How would moving the center of gravity forward change the stability of a conventional aircraft?

c$)$ When an aircraft goes supersonic, its aerodynamic center shifts from $0\mathrm{.}25c$ to $0\mathrm{.}5c.$ How would this change the stability of a conventional aircraft?