30.0 × 10-2 written in regular notation is 0.300
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2x - 10 =30 2x -10 = 30 +10 +10 2x = 40 /2 /2 x = 20
x^2 + 13x + 30 = 0 x^2 + 10x + 3x + 30 = 0 x(x + 10) + 3(x + 10) = 0 (x + 3)(x + 10) = 0 x = -3 or x = -10
0.2 is 2/10 so 0.2*30 = (2/10)*30 = 2*30/10 = 60/10 = 6
7
1 x 30, 2 x 15, 3 x 10, 5 x 6, 6 x 5, 10 x 3, 15 x 2, 30 x 1.