How many liner feet in 2.5 acres?

Answer 1

None, since there can be no conversion. A linear foot is a measure of length in 1-dimensional space while an acre is a measure of area in 2-dimensional space. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempt at comparisons or conversions between the two are fundamentally flawed.

Answer 2

Acres is a measure of area and linear feet is a length. You cannot convert area to length.