exam Maths Puzzle Numerical Ability

"ringing the Changes" is a process where the bells in a tower are rung and all possible permutations. Westminster abbey has 10 bells in its tower. In how many ways can its bells be rung?

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Help please
I am trying to figure out how to factor this to get the difference of two cubes:
27-u^3. Thank you!!! Sketch the following function
f(x)= -x squared + 4 and
label
max or min points with appropriate coordinates
y intercept
x intercept if any
describe mathematically how the graph transformed from f(x) = x squared