Fiddle sticks! I'm stuck again. Will someones see if I am right?

Question

Which of the following functions has a rate of change that stays the same?

A y=1/3x^2

b y=2^x***

c y=x^2+1

D y=x^2+1

when graphing A, D made Quadratic

c made linear

and b made exponential

if b isn't correct my back up answer is C

Answer 1

To have the rate of change stay the same, the function must be linear, that is,
the slope must be the same as in y = mx + b

A, C, and D are quadratic
B is exponential

So none of your functions has a constant rate of change.

Answer 2

Oops! C is suposed to be y=-7x+9...So since c is linear c is correct! Thank u