Simplify the given expression. (4 + 2i) - (1 - 7i) (2 points)

3+9i

Step-by-step explanation:

The given expression is

(4 + 2i) - (1 - 7i)

Expand the parenthesis to obtain;

4 + 2i-1 + 7i

Group the imaginary parts and the real number parts separately to obtain;

4 -1+ 2i+ 7i

Combine the similar terms to get;

3+ 9i

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10