-14.5
Basically, -(7.5+4) is -11.5 and then combine -3 with -11.5 which yields -14.5
tis always a good idea when factoring to start off with a quick prime factoring.

Answer:
The Arch is 630 ft tall
Step-by-step explanation:
Answer:
The solutions are the following:
- z=2(cos(π6)+isin(π6))=√3+12i
- z=2(cos(2π3)+isin(2π3))=−1+i√3
- z=2(cos(7π6)+isin(7π6))=−√3−12i
- z=2(cos(5π3)+isin(5π3))=1−i√3
<em>hope this helps!! :) --Siveth</em>