answer by true or false

1-If the cumulative cash flow series changes sign three times, this means that there is one real and two imaginary interest rate values that satisfy the equivalence equation. 2-In simplifying cash flow for the purpose of estimating the rate of return, moving a uniform series of receipts to the present as a single value will yield an estimated interest rate that is lower than the actual one. 3-The equivalent annual worth of unequal-life alternatives can be determined by first calculating their present worth for one life cycle and then multiplying that value by the A/P factor for their LCM. 4-Different-life alternatives can be compared by the present worth method based on equal service, if you calculate the annual worth of each alternative over its life cycle and then multiply the resulting A value by the P/A factor for their LCM.