If you horizontally stretch the quadratic parent function f(x)=x^2 by a factor of 3

The new function is (x/3)^2.

Step-by-step explanation:

If f(x) is  horizontally stretched by a factor a  the function is f(x/a).

So  for  f(x) = x^2  it becomes (x/3)^2.

answer: the answer is   graph (a)

c.

step-by-step explanation: it's not a. because 1/3 x 1/3 x 1/3 = 1/27 so that's not correct. | b. is also not correct because 7 x 7 1/3 is not actually 3 x 7 1/3 . and for d. multiplications are not additions so that left you with c. ( hope this out : d )