Do Exercise $4\mathrm{.}4$ on p$.61$ of your text, except translate the following assignment

statements.

a$.$ fred $=$ barney $*$ betty;

b$.$ dino $=($pebbles $+$ bambam$)*$ barney;

c$.$ width $=(x-k{)}^{*}(x+k)$;

d$.$ soft $=(a+ax)*(b-bx)*(c+cx)$;