1) Evaluate: 3a when a = 2 a) 6 b) 5 c) 4 d) 7 2) Evaluate: -b when b = -3 a) 3 b) -3 c) 0 d) -6 3) Evaluate: 4c when c = -1 a) -4 b) 4 c) 0 d) -1 4) Evaluate: 5d when d = 0 a) 0 b) 5 c) 1 d) -5 5) Evaluate: -2e when e = 3 a) -6 b) 6 c) -3 d) 2 6) Evaluate: a + b when a = 2, b = 3 a) 5 b) 6 c) 4 d) 3 7) Evaluate: 2x - y when x = 1, y = -2 a) 4 b) 3 c) 2 d) 0 8) Evaluate: 3m + n when m = -1, n = 4 a) 1 b) -1 c) 7 d) -3 9) Evaluate: p - 2q when p = 5, q = 2 a) 1 b) 3 c) 2 d) 0 10) Evaluate: 4r + s when r = 0, s = -3 a) -3 b) 3 c) 1 d) 0 11) Evaluate: 2a - 3b when a = 3, b = 1 a) 3 b) 2 c) 1 d) 0 12) Evaluate: x + y + z when x = 1, y = -1, z = 2 a) 2 b) 1 c) 0 d) 3 13) Evaluate: 5u - v when u = -1, v = -5 a) 0 b) 5 c) -5 d) -10 14) Evaluate: 2x + 3y when x = 2, y = -1 a) 1 b) -1 c) 2 d) 3 15) Evaluate: a2 when a = 3 a) 9 b) 6 c) 3 d) 12 16) Evaluate: b2 when b = -2 a) 4 b) -4 c) 2 d) -2 17) Evaluate: c2 when c = 1 a) 1 b) 3 c) 0 d) -1 18) Evaluate: d2 when d = 0 a) 0 b) 1 c) 2 d) -1 19) Evaluate: e2 - f when e = 2, f = 1 a) 3 b) 2 c) 1 d) 0 20) Evaluate: g2 + h when g = -1, h = 2 a) 3 b) 1 c) 0 d) -1

Substitution : Positive, Negative and Powers

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