If a triangle has one angle that measures 62.5o and another angle that measures 77o , then what is the measurement of the last angle?

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.