Cakulate the ionic strength of a solution that is

a$.0\mathrm{.}070$M in

lanicstrength $=$

b$.0\mathrm{.}70M$ in$.$

tonic strength $=$

c$.0\mathrm{.}70M$ in and $0\mathrm{.}80M$ in$.$

lonic strength $=$

d$.0\mathrm{.}070M$ in and $0\mathrm{.}080M$ in $.$

lonic strength $-$