1. What symbol is used to divide the left operand by the right operand and 
return the remainder?

% (modulus).


2. explain the difference between an assignment operator and a coumpund 
assignment operator.

an assignment operator assigns the value on the right to the variable 
on the left. A compund assignment operator will peform and operation operation on 
the varible on the left and assign it a new value based the results of the operator.

assignement: $myVar = 90;
compound assignment $myVar += 90; (same as $myVar


3.