exam Maths Puzzle Numerical Ability

Convert the numberal 412 base 5 to base 10

I got 107 is this right?

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exam Other Question

For the function defined by f(x) =5x - 4, find a formula for f -1(x). f of(x)=x(to the third)-5x(squared)-25x+125, find the zeros. For each zero you find, state whether the graph of f(s)crosses or only touches the x-axis.