Answer:
150m
Step-by-step explanation:

The two best deals would be buy two get two free and the 1/2 off because both would equal 50% off the total price of buying 4 wheels.
This is better than the alternative of only 45% off.
Answer:
8 +3i
Step-by-step explanation:
(9 + 6i) − (1 + 3i)
Distribute the minus sign
(9 + 6i) − 1 - 3i
Combine like terms
9-1 + 6i -3i
8 +3i