Answer: Any pictures or more information?
Step-by-step explanation: Really happy to help you
Answer:
A
Step-by-step explanation:
X is moving by 9s and Y is moving by 10
I can’t quite see the image, can you send another to help you better:)
We know in these kind of triangles that have a 90 degrees angle, we can do:

so the first question:

and then:

so , when you want to rationalize , usually you must multiply the irrational factor as 1:

so , now multiply:

in the next question,we know negative numbers in radical don't have any solution so 2 is correct,
F(x) = x(x -1)
f(3) = 3*2 = 6
f(6) = 6*5 = 30
so f(f(3)) = 30 . . . . . selection A