exam Maths Puzzle Numerical Ability

determine the domain of the function f(x)=sqrt of 3-x

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exam Other Question

A figure shows the graphs of f(x)=x^3 and g(x)=ax^3. What can you conclude about the value of a? My answer would be 0<a<1, but I'm unsure of my answer. Thanks for checking my an I was able to use the quadratic calculator for some of the problems, but this one I do not think I can:
Solve by using the quadratic formula:
x^2 = 5x - 5

Please help! Thank you