Help with this Geometric Proof please! Given AC=4DE, BC=4EC, Prove BCA is Congruent to ECD (BCA~ECD)

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test

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%)