## Elementary Algebra

To simplify, we approximate using the closest perfect square to each number: a) $3(3) - 4(5) + 6(8) = 37$ b) $9(5) + 5(6) - 3(9) = 48$ c) $12(2) + 13(4) + 9(7) = 129$ d) $3(10) - 4(9) -7(11) = -83$ e) $4(13) + 2(14) +5(15) =155$ f) $-3(16) -6(17) + 11(18) = 44$