For the following five spreadsheet functions, $(a)$ write the values of the engineering economy symbols $P,F,A,i,$ and $n,$ using a $?$ for the symbol that is to be determined, and $($b$)$ state whether the displayed answer will have a positive sign, a negative sign, or it can't be determined from the entries.

$($a$)$

$,n=$

$(4)=$NPER$(10\%,-290,12000)P=$

$,F=$

$,A=$

$,i=$

$,n=$