exam Maths Puzzle Numerical Ability

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.

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exam Other Question

Convert the numberal 412 base 5 to base 10

I got 107 is this right?
Add and express in simplest form:

5 11
--- + ----
4cd 4cd

I believe the answer to this problem is:

16
---
8cd

Simplest form is
1
--
2cd

Is this correct? Thank you