Inadequate I'm afraid. Many observe that mathematics is true and yet for many mathematical truths there is no supporting scientific evidence.
Again you omit my qualification of "the real world". I didn't tack that qualification on for fun.
Mathematics, by itself, tells us
nothing about the real world. In fact mathematics is tautological. It doesn't tell us anything.
As an example, does mathematics tell us that the angles of a triangle add up to 180 degrees? If your mathematical education stopped in school, you might say yes. But it actually doesn't What mathematics tells us is "if
this set of five axioms are all true then the angles of a triangle add up to 180 degrees". How can we know that the set of five axioms are true in the real world? We can draw some triangles and measure the angles. This is doing science. (Spoiler: it turns out that in general, the angles of triangles don't add up to 180 degrees in the real world).
All mathematical theorems are really like this. They are all based on a certain set of axioms that are just assumed to be true but need not necessarily apply in the real world.
What you don't have is scientific evidence that science is the only way of establishing truth in the real world.
I do. First of all we note that science is extraordinarily successful. Second, we note there aren't any other methods, or if there are, people like you seem unbelievably reluctant to tell us what they are.
You could win this whole argument simply by coming up with an alternate method to science but you won't because, if you could you would have done it by now.
Edit: that's not to say that there is no alternate method but you don't know what it is and neither does anybody else. So for now, science is the only reliable method we have of finding out about the real world.