Cesium-137 has a half-life of 30 years. How much is left of a 5 gram sample after 90 years?

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.

B"hf and f-"  is the correct answer took the test on edgenuity and got it right