Acoin is flipped 3 times what is the probability that heads appears twice

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)

Ineed the question and choices are in the

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok