Answer:
CD and DE are perpendicular because their slopes are -1/3 and 3
Step-by-step explanation:
Perpendicular lines will always have the opposite reciprocal.
The answer is C. 60 / 12 = 5 153.54 / 5 = 30.71
2/3 times 90/1 equals 180/3, which is 60 degrees.
PEMDAS
Parenthesis
Exponent
Multiplication
Division
Addition
Subtraction
ask yourself which one of these comes first in the given equation
hint: its the exponent