Solve The Quadratics m^2-65m=0

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.

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6