I have chosen $x=10 and $y=6 for all of my operations. Variables are on script lines 10 and 11.

Addition operator #1 the operator (+) allows me to add variables (eg $x and $y):

16

Subtraction operator #2 (-) allows me to subtract variables:

4

Multiplication operator #3 (*) allows me to multiply variables:

60

Division operator #4 (/) allows me to divide variables:

1.6666666666667

Exponential operator #5 (**) allows me to raise the power of one variable to another variable:

1000000