2.5 + 3 + 4 = 9.5 then divide by 3 (the number of numbers) = 3.167
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25
-4/25 + 19/25 = 15/25 = 3/5
25 + x
x2+4x+4 = 25 x2+4x+4-25 = 0 x2+4x-21 = 0 (x+7)(x-3) = 0 x = -7 or x = 3
2X + 5X + 4 = 25 add the X terms together 7X + 4 = 25 subtract 4 from each side 7X + 4 - 4 = 25 - 4 7X = 21 divide both sides integers by 7 (7/7)X = 21/7 X = 3 ----------check in original equation 2(3) + 5(3) + 4 = 25 6 + 15 + 4 = 25 25 = 25 checks