The answer to the question
Answer:
-3+15i
Step-by-step explanation:
Apply complex arithmetic rule: 

-3 * 3 -3 (-2) = -3

This arithmetic sequence has first term 6 and common difference -1. The general formula is
an = a1 +(n-1)d
For your sequence, this is
an = 6 +(n-1)*(-1)
an = 7 - n
Answer:
408 units^2
Step-by-step explanation:
area of triangle: 1/2(6)(8)=24
24*2=48
area of bottom rectangle: 6(15)=90
area of front rectangle: 15(10)=150
area of back rectangle: 8(15)=120
48+90+150+120=408
Therefore, 408 units^2
I hope this helped and have a good rest of your day!