PLEASE HELP I CANT DO MATH!!

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Find the value of x to the nearest tenth.

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