Necesito ayuda con los problemas 10 y 11

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Using the graph below, select all statements that are true. a. f(0.6)=0 b. f(-3.2)=-3 c. f(5.1)=5 d. this is the graph of the greatest integer function. e. this graph is one-to-one.

With this question! what is process of elimination? ? p.s. my brothers acc got banned so add his new one @ yamauchiyamyam17

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .