Answer:

Step-by-step explanation:
As you're used to do in the real plane, midpoint is the average of Real and Imaginary part. So 
Answer:
-1/2
It is a negative slope going down 1 over 2
Answer:
7.47
Step-by-step explanation:
multiply by 2
divide by 10
cool trick to find out how much to tip
Answer:
what number do you want to "Multiply by 3, then subtract 4."
Example:
(12 x 3) - 4
36 - 4 = 32
Solve whats in the parentheses first
5k+25+4<21+6k
5k+29<21+6k
plug in a number in k for both sides
5(1)+29<21+6(1)
5+29<21+6
34<27
5(2)+29<21+6(2)
10+29<21+12
39<33
so 5(k+5)+4 is greater than 21+6k