There is no sign in between 2b and 6.
Case 1:
Assuming the sign is '+'
Then, 2b + 6 for b = 9 is given by 2(9) + 6 = 18 + 6 = 24.
Case 2:
Assuming the sign is '-'
Then, 2b - 6 for b = 9 is given by 2(9) - 6 = 18 - 6 = 12.
Case 3:
Assuming the sign is 'x'
Then, 2b x 6 for b = 9 is given by 2(9) x 6 = 18 x 6 = 108.
Case 4:
Assuming the sign is '÷'
Then, 2b ÷ 6 for b = 9 is given by 2(9) ÷ 6 = 18 ÷ 6 = 3.