The difference of 5 and y is at least 19

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.