What's the answer to this math problem

Which function is increasing? o a. f(x)=(1/15)* o b. f(x)= (0.5)* o c. f(x)=(1/5)* o d. f(x) = 5*

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

41/17 as a decimal rounded to the nearest hundredth