Does anybody know how to solve this problem, but using the work shown to help solve? The value of y varies directly with x. When y=75, x= 0.5. What is the value of y when x is 2.25?

Even though I pulled up the work, I still don’t know what to do ‍♀️

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