binary operations

Question

a⊗b=a2+b+4a⊗b=a2+b+4 

Simplify each of the following. Do the order of operations (do what is in parentheses first).

1.  (7⊗5)⊗3

Answer 1

Do you have a definition for 'a2' ?

Is this representing our standard a*a (a squared), or is it supposed to represent a shorthand for the multiplication a*2?

Also, is the + the standard addition operation?