Engineering Economics
What is the type of annuity where the payments are made at the beginning of the each period starting from the first period?

Deferred annuity
Perpetuity
Ordinary annuity
Annuity due

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Engineering Economics
In a cash-flow diagram:

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

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