for the bottom question, Im trying to calcukate the value using this price of bond formula :

P= Face Value / (1+YTM n )^n

YTM=Yield to Maturity

I dont know what the n should be.

Suppose a risk-free zero-coupon bond with $1000 FV, which matures in 1.5 years, is trading for $940. What is its YTM expressed as an EAR and as a 6 month APR? What is the value (price) of the bond 2 months prior to maturity assuming the same YTM