Which property explains why these two expressions are equal?
-5 + (x + 4) = -5 + (4 + x)
a) associative property
b) commutative property
c) distributive property
d) multiplicative identity property

Kilgore trout creates a new scale to diagnose depression. however, his scale only assesses one symptom of depression while ignoring others. which of the following is his new scale most likely lacking? a) test-retest reliability b) discriminant validity c) criterion validity d) alternate-forms reliability e) content validity f) none of the above