The first one is incorrect
Answer:
d≤−6
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable.
Correct choice is C.
Answer: The angles are 30 30, 150, 150
Step-by-step explanation: Two lines intersect means they cross. According to the vertical angle theorem, angles that are across are the same, a line is 180 degrees so it means the angles that make up the supplementary pair add up to 180(180-30=150). So there are 2 150 degree angles and 2 30 degree angles