Answer:
B
Step-by-step explanation:
To find A' they used the rule of multiplication, which is:
the derivative of a product of two terms is the first term times the derivative of the second term plus the second term times the derivative of the first.
To find b' they just isolated b'
Answer:
D. 180 degres
Step-by-step explanation:
Here are some, 543,555, 543,123, and 543,369
Hope this helps