## Algebra 1

a) 131.88 cm$^2$ b) no, no
a) $\pi r(l+r)\longrightarrow$ substitute the given values $=3.14(3)(11+3)\longrightarrow$ add in parentheses $=3.14(3)(14)\longrightarrow$ multiply $=131.88\ cm^2$ b) The surface area does not double in either case because l and r are used as addends, not just as factors. $\pi r(l+r)\longrightarrow$ substitute the given values $=3.14(3)(22+3)\longrightarrow$ add in parentheses $=3.14(3)(25)\longrightarrow$ multiply $=235.5 cm^2$ $\pi r(l+r)\longrightarrow$ substitute the given values $=3.14(6)(11+6)\longrightarrow$ add in parentheses $=3.14(6)(17)\longrightarrow$ multiply $=320.28 cm^2$