Which graph has a y-intercept of - 1/2 ?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Asap! i'm not good math and i'm lost.

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?