Solve each system by substitution of {y=3x-4 {4x+3y=-1

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The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.

32a³b² 8ab² simplify the following expression.