Question: 1. The formula for the future value of an annuity due involves the expression (1 + i)+1 1 bd

1. The formula for the future value of an annuity due involves the expression

(1 + i)

Write this expression over a common denominator and factor the numerator to simplify?
2. Two thin lenses with focal lengths p and q and separated by a distance d have their combined focal length given by the reciprocal of

РЯ bd

(a) Combine these fractions.
(b) Use the reciprocal of your answer in (a) to find the combined focal length?

(1 + i)"+1 1 bd

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