
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A factory uses radiation to sterilize food and is now planning to build a dormitory for its workers nearby, with radiation protection measures. The choice of radiation protection materials for the dormitory depends on the distance from the dormitory to the factory. The relationship between the total cost of building the dormitory $p$ (in ten thousand yuan) and the distance $x$ (in km) from the dormitory to the factory is: $p= \frac {k}{x+5}$ ($0\leq x\leq 8$). If the construction cost is 100 ten thousand yuan when the distance is 1km. For convenience, a road will also be built between the factory and the dormitory. It is known that purchasing road construction equipment costs 5 ten thousand yuan, and the cost per kilometer for paving is 6 ten thousand yuan. Let $f(x)$ be the sum of the costs of building the dormitory and constructing the road.
(1) Find the expression for $f(x)$ and state its domain;
(2) How far should the dormitory be built from the factory to minimize the total cost $f(x)$, and what is the minimum value?

Present the answer in LaTex format: \boxed{Your answer}
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