It would be 270,725. The last choice.
Find common denominators and move from there
5/6 x 12
60 / 6 = 10
It takes 10 feet of string to make 12 bracelets.
The answers
1)-7
2)-1.5
3) 2
Alright, we're in the home stretch here :) All you need to remember is that i² = -1. Otherwise, it is the same as FOIL
(3-2i)(1+7i)
3-2i+21i-14i² ← Replace the i² with -1, then simplify like numbers
3+19i+14
17+19i or C