find the value of each of these expressions when the variable is replaced by the given numeral. 1. if B=2, then 5B 2. if S=7, then s+6 = 3. if C =6, then c-4 = 4. if N =11, then 3n + 7 = 5. if a=7 and b=0.5, then 5(a+b)=​