How much faster does oxygen (O2) effuse than nitrogen (N2) at the same temperature?

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.

13) a 14) a15) b16) i don't know sorry17) a (maybe)

Ithink its called the coefficent.