Is this a right triangle? 16 14 8 Yes No​

For the equations below which statement is true ? -2x=14 6x=-42

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If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?