## Elementary Algebra

We plug in the given values into the equation to obtain: a) $A = 2(22/7)(7)(7+19) = 836$ b) $A = 2(22/7)(14)(14+20) = 2992$ c) $A = 2(22/7)(3)(3+4) = 132$ d) $A = 2(22/7)(5)(5+9) = 440$