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

two straight lines intersect at a point to form angle a. the measure of the angle opposite to angle a is 30 degrees. angle a is the angle of a right triangle having another angle equal to b. a triangle with one angle labeled c is on the left of the figure. the angle adjacent to c is labeled 75 degrees.

Jane is trying to decide how many tv shows she should watch tonight. she gets $10 of value from each tv show she watches. if she watches one show she gives up working on her math homework (which she values at $5). if she watches two, she also gives up her economics homework (which she values at $8). if she watches three then she also has to give up her biology homework (which she values at $12). using marginal analysis, how many shows does she watch? one