$($s parts a$,$ b$,$ c$)$:

characteristics:

$S_{\text{R}\text{E}\text{F}}=10f{t}^2$

airfoil section efficiencipe is: $a_0=2$ ang loading $=5$

a$.$

all equal $1\mathrm{.}0.$ The indicated airspeed is $45.$ KLAS $.$

$+$

At sea level, what angle of attack $$ is required for steady level flight?

At sea level, what is the L$/$D of the aircraft at the condition determined in part a$?$