Can I please have help finding the value of x?

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 both problems. a. s.a. p directions on photo ^

Consider the sequence below. 3 , 1 , 1/3 , 1/9 , select the explicit function which defines the sequence.