Answer: 75 degrees
Step-by-step explanation: supplementary means 180 so you do 180-105 which is 75
Answer:
1st one
Step-by-step explanation:
Answer:
x = -7 and x = 3
Step-by-step explanation:
x² + 4x - 21 = 0 factors as follows: (x + 7)(x - 3) = 0.
Then x = -7 and x = 3.