PLS HELP ASAP

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

What rotation was applied to triangle def to create d’e’f’?

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%)