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319 + 23 = 342
67 plus 3 equals 70.
y = -16x2 + 342At the x-intercepts, y=0-16x2 + 342 = 016x2 = 342x2 = 342/16 = 21.375x = plus and minus sqrt(21.375) = approx. plus and minus 4.6233 (rounded)
67+8+9+42 = 126
88 + 67 = 155