Please help this is math/ personal finance

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

❤️ (geometry) does the construction demonstrate how to copy an angle correctly using technology a) yes; the distance between points a and f was used to create circle h b) yes; the distance between points f and g was used to create circle h c)no; the distance between points a and f was used to create circle h d) no; the distance between points f and g was used to create circle h

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?