4x + 7 = 3x + 18 ! & show work you!

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

Which of the symbols correctly relates the two numbers ?

If f(x) = -2x2 - 3 and g(x) = 3x - 4, then f(g(2))=