exam Maths Puzzle Numerical Ability

I need to know that the symbol ^ means. The math problem is 3^2*(6-4)+8.

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exam Other Question

Let f(x) =2x+5 and g(x) = x^2+4 Find the following:

(g*f)(x)
f(g(x))
(f*g))(-3)
g(f(4))

These are compositions of functions, not multiplication. Warren has 40 coins (all nickels, dimes, and quarters) worth $4.05. He has 7 more nickels than dimes. How many quarters does Warren have?