The expression (3r+5)(2r-6) is equivalent to ?

Here is another math questions. i will keep asking different questions. 4^2x=6

What is the scale factor of axyz to auvw?

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