Question

h + j (j - h); use h=2, and j=6

Answer 1

First plug in all the numbers: 2+6 (6-2)
Then do the stuff in the parentheses: 6-2=4
All you have left to do is 2+6+4=12

Answer 2

Answer: 26

Remember: PEMDAS
P arenthesis 
E xponents
M ultiplication (left to right)
D ivision (left to right)
A ddition (left to right)
S ubtraction (left to right)


h + j(j - h)              Substitution
2 + 6(6 - 2)           Parenthesis         
2 + 6(4)                 Multiplication
2 + 24                   Addition
26                         Answer!