How can I find the volume of these shapes properly? I need help!!

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.

Is ofat (-25, 0), (25, 0) co- (0, -15), (0, 15)?

What is the t intercept of the line given by the equation below y= -10x + 14