Answer:
Tax 3.78 $ and tip 7.56 $
Step-by-step explanation:
42*0.09 = 3.78
42*0.18 = 7.56
The average of those two values is
(-11-4 +i+4i)/2 = -(15/2) +(5/2)i
To transform it into percent we want to have 100 into denominator. The easiest way is divide numerator and denominator by 3 (thats because than it doesnt change the value of fraction), so:

- its the result
Alright, so the answer for:
3) is 3v + 4