In ΔBCD, B D ‾ BD is extended through point D to point E, D E = ( 9 x − 12 ) ∘ m∠CDE=(9x−12) ∘ , m ∠ B C D = ( 2 x + 3 ) ∘ m∠BCD=(2x+3) ∘ , and m ∠ D B C = ( 3 x + 5 ) ∘ m∠DBC=(3x+5) ∘ . Find m ∠ B C D . m∠BCD.

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Plot the intercepts to graph the equation

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%)