Helllp ok so. my book says 7% sales tax or 1/20 sales tax decide which number form is more common then find whic is greater

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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.

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points