Please help me is this a function and explain why

No.

Step-by-step explanation:

For functions, there can only be one y-value to every x value, and in this diagram x=0 has two y-values, therefore it is not a function      

Not a function

Step-by-step explanation:In a function, an input can only have one output. So the fact that 0 has two different outputs means it is not a function.

the expression (1.26)2t reveals the approximate rate of increases in the number of plants semiannually.

hope this : )

c - they will have the same distribution

step-by-step explanation:

this is the only one that could make sense. : )