Plz me i am suck!

which counterexample disproves the conjecture?
if a perfect square is odd, then its square root is multiple of 3?
a: 4
b: 9
c: 25
d: 81

which counterexample disproves the conjecture?
if n is a positive integer , then 2n - 1 is a prime number.
a: n = 6
b: n = 5
c: n = 3
d: n = 2

A. plot the data for the functions f(x) and g(x) on a grid and connect the points. x -2 -1 0 1 2 f(x) 1/9 1/3 1 3 9 x -2 -1 0 1 2 g(x) -4 -2 0 2 4 b. which function could be described as exponential and which as linear? explain. c. if the functions continue with the same pattern, will the function values ever be equal? if so, give estimates for the value of x that will make the function values equals. if not, explain why the function values will never be equal.