Name the property of real numbers illustrated by the equation.

: )
a.
closure property
b.
commutative property of multiplication
c.
commutative property of addition
d.
associative property of addition

This would be C) Commutative Property of Addition.

Why?

Simply because the numbers are in reverse order after the equal sign. 

See how "π+ 10" turns into "10 + π?"

This very simply switches the number order.

Another example of the commutative property of addition is here :

Ex : 8 + 6 = 6 + 8

See how I very easily just switched the numbers?

So, your answer is C) commutative property of addition.

~Hope I helped!~