Someone Plz help will give Brainless. Pic Above.Find the measure of the unknown angles, indicated by lower case letters. (Show your work or give a reason to justify your answers for full marks. NEED TO DO ALL 4 of u help with at least 2 u get Brainless

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%)