Question

suppose that the function y=f(x) is increasing on the interval from (-1,5). Over what interval is the graph of y=f(x+2) increasing?

Answer 1

You are expected to know your horizontal translations.

f(x+2) is 2 left of f(x). It's a little counter-intuitive unless you write it in standard form.

f(x-(-2)) is 2 left of f(x)