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Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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.

State one method by which you can recognize a perfect square trinomial.