380
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x2 + x = 380 x2 + x - 380 = 0 (x + 20)(x - 19) x = 19, -20
19 dollars 20 x .05 = 1 20 - 1 = 19
171. (9 x 20 = 180 - 9 = 171).19 x 9 = 171
Let the first number be x, the second x + 1, and the third x + 2. So, x + x + 1 + x + 2 = 60 3x + 3 = 60 subtract 3 to both sides; 3x = 57 divide by 3 to both sides; x = 19 x + 1 = 19 + 1 = 20 x + 2 = 19 + 2 = 21 Thus the numbers are 19, 20, and 21.
-19