The product of 6287×543 = 3,413,841 . What is the value of 628.7×5.43

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.

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