Engineering Economics
The alternatives which are standalone solutions for given situations in engineering involve:

The anticipated resalable value (salvage value) and the interest return (rate of return)
All of these
A purchase cost (first cost)
The anticipated life of the assets

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Engineering Economics
In a cash-flow diagram:

Time 1 is considered to be the end of time period 1
A vertical arrow pointing up indicates a positive cash flow
Time 0 is considered to be the present
All of these

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