What can the value be of the letter m

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

Find the circumference of a pizza with a diameter of 10 inches round 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