15 ports 3. * Triangle ABC is similar to triangle AYZ. Y B A C 24 YZ Which proportion must be true? BA ZA BA la gli ZY BC A AC AY ZY AY AC AZ C AB​

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%)