180 = 3 x 60
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Two supplementary angles add up to 180 degrees. If one of the angles is x degrees, then the other angle will be 3x - 60. So we have: x + 3x - 60 = 180 4x - 60 + 60 = 180 + 60 4x = 240 4x/4 = 240/4 x = 60 3x - 60 = 3(60) - 60 = 120 Thus, the angles have measures of 60 and 120 degrees.
the number = -20Let = the number3 times a number = 3 * x or 3xdifference of 9 and 3 times a number = 9 - 3xdifference of 9 and three times a number equals 69: 9 - 3x = 699 - 3x = 699 - 3x - 9 = 69 - 9-3x = 60-3x/-3 = 60/-3x = -20
3x + 4x + 5x = 60 feet 12x = 60 x = 5 The longest side is 5x therefore it is 25 feet. That means that the other sides are 4x (20 feet) and 3x (15 feet). 25 + 20 + 15 = 60
3x + 3x + 3x = 3* (3x) = 9x
3x * (x - 4) = 3x*x - 3x*4 = 3x^2 - 12x.