If $=11\mathrm{.}7\frac{m}{m^{0}C}$ for steel and $=23\mathrm{.}0\frac{m}{m^{0}C}$ for aluminum. Compute the

following:

a$)$ Find the reaction at the left support

b$)$ Find the stress at the steel.

c$)$ Find the stress at the aluminum.