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lauren and imposter are correct
1.graph d 2.x2-1=0 3.-1+-i 15/4 4.-4,2 5.one real solution 6.0.83 or 3.55second 7.30 inches by 60 inches 8.x=4 or x=6 9.310$ at $2 per kilogram 10. graph c 11.(x-1)(x+5) 12.y=-3(x+8^2)+2 13.false 14.true 15false 16.false