Given a circle with a radius of 3, which equation expresses π as the ratio of the circumference of a circle to its diameter?

I'll give brainliest if you answer right : )

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.

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42