I need help solving all three was these plus graphing and write a solution set in interval notation by tonight HELP!!

Which expression is equivalent to sq-80

Which fraction represents the ratio 35 : 42 in simplest form

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