exam Maths Puzzle Numerical Ability

Patty Wack had $900. She invested part of it at 12% and the rest at 9%. If her total annual return was $96, how much did she invest at each rate?
-----at 12% -----at 9%

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exam Other Question

Graph on a rectangular coordinate system:
y > x + 2

(PS: Please show how you worked it out. I have been having mojor problems with these kinds of questions. Thanks.) find f(x) and g(x) so that the function can be described as y=f(g(x)). (there may be mor ethen one decompostition.)
i was absent this day and was never told how to decompose funt