Engineering Economics
What is the type of annuity that does not have a fixed time span but continues indefinitely or forever?

Deferred annuity
Ordinary annuity
Annuity due
Perpetuity

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Engineering Economics
In a cash-flow diagram:

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

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Engineering Economics
In a cash flow series:

All of these
The gradient in the cash flow may be positive or negative
Uniform gradient signifies that an income or disbursement changes by the same amount in each interest period
Either an increase or decrease in the amount of a cash flow is called the gradient

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