exam Maths Puzzle Numerical Ability

if f(x)=3x-4 and g(x)=x�, evaluate fg</font>g and gg</font>f.

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exam Other Question

Stock X has a 10% expected return, a beta coefficient of 0.9, and a 35% standard deviation of expected returns. Stock Y has a 12.5% expecter return, a beta coefficient of 1.2, and Can you help me solve this problem?
I am suppose to solve 2x2 by elimination method.

2p-5q = -33
6p-7q =39

Thank you,
Yolanda