For Problems $2\mathrm{.}1$ to $2\mathrm{.}5,$ determine the cracking moments for the

sections shown if $f_c^{\text{'}}=4000$ and $f_c=7\mathrm{.}5\sqrt[\phantom{2}]{f_c^{\text{'}}},$ normal$-$weight

concrete, $=1\mathrm{.}0.$

Do question $2\mathrm{.}3$ and show work